Практическое руководство. Добавление и удаление элементов, отображаемых в элементах управления ComboBox, ListBox и CheckedListBox в Windows Forms How to: Add and Remove Items from a Windows Forms ComboBox, ListBox, or CheckedListBox Control

Элементы могут быть добавлены в Windows Forms поле со списком, списком или списком флажков различными способами, поскольку эти элементы управления могут быть привязаны к различным источникам данных. Items can be added to a Windows Forms combo box, list box, or checked list box in a variety of ways, because these controls can be bound to a variety of data sources. Однако в этом разделе демонстрируется простейший метод и не требуется привязка данных. However, this topic demonstrates the simplest method and requires no data binding. Отображаемые элементы обычно являются строками. Однако можно использовать любой объект. The items displayed are usually strings; however, any object can be used. Текст, отображаемый в элементе управления, является значением, возвращаемым ToString методом объекта. The text that is displayed in the control is the value returned by the object’s ToString method.

Добавление элементов To add items

Добавьте строку или объект в список с помощью Add метода ObjectCollection класса. Add the string or object to the list by using the Add method of the ObjectCollection class. Ссылка на коллекцию осуществляется с помощью Items Свойства: The collection is referenced using the Items property:

Вставьте строку или объект в нужную точку списка с помощью Insert метода: Insert the string or object at the desired point in the list with the Insert method:

Назначьте весь массив Items коллекции: Assign an entire array to the Items collection:

Удаление элемента To remove an item

Вызовите Remove метод или, RemoveAt чтобы удалить элементы. Call the Remove or RemoveAt method to delete items.

Remove содержит один аргумент, указывающий удаляемый элемент. RemoveAt Remove has one argument that specifies the item to remove. RemoveAt Удаляет элемент с указанным номером индекса. removes the item with the specified index number.

Удаление всех элементов To remove all items

Вызовите Clear метод, чтобы удалить все элементы из коллекции: Call the Clear method to remove all items from the collection:

Selecting Items from a List Box

Use Windows PowerShell 3.0 and later releases to create a dialog box that lets users select items from a list box control.

Create a list box control, and select items from it

Copy and then paste the following into Windows PowerShell ISE, and then save it as a Windows PowerShell script (.ps1).

The script begins by loading two .NET Framework classes: System.Drawing and System.Windows.Forms. You then start a new instance of the .NET Framework class System.Windows.Forms.Form; that provides a blank form or window to which you can start adding controls.

After you create an instance of the Form class, assign values to three properties of this class.

Text. This becomes the title of the window.

Size. This is the size of the form, in pixels. The preceding script creates a form that’s 300 pixels wide by 200 pixels tall.

StartingPosition. This optional property is set to CenterScreen in the preceding script. If you don’t add this property, Windows selects a location when the form is opened. By setting the StartingPosition to CenterScreen, you’re automatically displaying the form in the middle of the screen each time it loads.

Next, create an OK button for your form. Specify the size and behavior of the OK button. In this example, the button position is 120 pixels from the form’s top edge, and 75 pixels from the left edge. The button height is 23 pixels, while the button length is 75 pixels. The script uses predefined Windows Forms types to determine the button behaviors.

Similarly, you create a Cancel button. The Cancel button is 120 pixels from the top, but 150 pixels from the left edge of the window.

Next, provide label text on your window that describes the information you want users to provide. In this case, you want users to select a computer.

Add the control (in this case, a list box) that lets users provide the information you’ve described in your label text. There are many other controls you can apply besides list boxes; for more controls, see System.Windows.Forms Namespace.

In the next section, you specify the values you want the list box to display to users.

The list box created by this script allows only one selection. To create a list box control that allows multiple selections, specify a value for the SelectionMode property, similarly to the following: $listBox.SelectionMode = ‘MultiExtended’ . For more information, see Multiple-selection List Boxes.

Add the list box control to your form, and instruct Windows to open the form atop other windows and dialog boxes when it’s opened.

Add the following line of code to display the form in Windows.

Finally, the code inside the If block instructs Windows what to do with the form after users select an option from the list box, and then click the OK button or press the Enter key.

List Box Class

Definition

Represents a Windows control to display a list of items.

Examples

The following code example demonstrates how to create a ListBox control that displays multiple items in columns and can have more than one item selected in the control’s list. The code for the example adds 50 items to the ListBox using the Add method of the ListBox.ObjectCollection class and then selects three items from the list using the SetSelected method. The code then displays values from the ListBox.SelectedObjectCollection collection, through the SelectedItems property, and the ListBox.SelectedIndexCollection, through the SelectedIndices property. This example requires that the code is located in and called from a Form.

Remarks

The ListBox control enables you to display a list of items to the user that the user can select by clicking. A ListBox control can provide single or multiple selections using the SelectionMode property. The ListBox also provides the MultiColumn property to enable the display of items in columns instead of a straight vertical list of items. With this, the control can display more visible items and the user no longer needs to scroll to an item.

Typically, Windows handles the task of drawing the items to display in the ListBox. You can use the DrawMode property, and handle the MeasureItem and DrawItem events so you can override the automatic drawing that Windows provides and draw the items yourself. You can use owner-drawn ListBox controls to display variable-height items, images, or a different color or font for the text of each item in the list. The HorizontalExtent property, GetItemHeight, and GetItemRectangle also help you draw your own items.

In addition to display and selection functionality, the ListBox also provides features that enable you to efficiently add items to the ListBox and to find text within the items of the list. The BeginUpdate and EndUpdate methods enable you to add a large number of items to the ListBox without the control being repainted each time an item is added to the list. The FindString and FindStringExact methods enable you to search for an item in the list that contains a specific search string.

The Items, SelectedItems, and SelectedIndices properties provide access to the three collections that are used by the ListBox. The following table outlines the three collections used by the ListBox and their use within the control.

Collection class	Use within the ListBox
ListBox.ObjectCollection	Contains all items contained in the ListBox control.
ListBox.SelectedObjectCollection	Contains a collection of the selected items which is a subset of the items contained in the ListBox control.
ListBox.SelectedIndexCollection	Contains a collection of the selected indexes, which is a subset of the indexes of the ListBox.ObjectCollection. These indexes specify items that are selected.

The following three examples show the three indexed collections that the ListBox class supports.

The following table shows an example of how the ListBox.ObjectCollection stores the items of the ListBox as well as their selection state within an example ListBox.

Index	Item	Selection state within the ListBox
0	object1	Unselected
1	object2	Selected
2	object3	Unselected
3	object4	Selected
4	object5	Selected

Based on the ListBox.ObjectCollection shown in the previous table, this table shows how the ListBox.SelectedObjectCollection would appear.

Index	Item
0	object2
1	object4
2	object5

Based on the ListBox.ObjectCollection shown in the previous table, this table shows how the ListBox.SelectedIndexCollection would appear.

Index	Index of item
0	1
1	3
2	4

The Add method of the ListBox.ObjectCollection class enables you to add items to the ListBox. The Add method can accept any object when adding a member to the ListBox. When an object is being added to the ListBox, the control uses the text defined in the ToString method of the object unless a member name within the object is specified in the DisplayMember property. In addition to adding items using the Add method of the ListBox.ObjectCollection class you can also add items using the DataSource property of the ListControl class.

If you have a ListBox, ComboBox, or CheckedListBox on a base Windows form and want to modify the string collections of those controls in a derived Windows form, the string collections of those controls in the base Windows form must be empty. If the string collections are not empty, they become read-only when you derive another Windows form.

Constructors

Initializes a new instance of the ListBox class.

Fields

Specifies the default item height for an owner-drawn ListBox.

Specifies that no matches are found during a search.

Properties

Gets the AccessibleObject assigned to the control.

(Inherited from Control) AccessibleDefaultActionDescription

Gets or sets the default action description of the control for use by accessibility client applications.

(Inherited from Control) AccessibleDescription

Gets or sets the description of the control used by accessibility client applications.

(Inherited from Control) AccessibleName

Gets or sets the name of the control used by accessibility client applications.

(Inherited from Control) AccessibleRole

Gets or sets the accessible role of the control.

(Inherited from Control) AllowDrop

Gets or sets a value indicating whether the control can accept data that the user drags onto it.

(Inherited from Control) AllowSelection

Gets a value indicating whether the ListBox currently enables selection of list items.

Gets a value indicating whether the list enables selection of list items.

(Inherited from ListControl) Anchor

Gets or sets the edges of the container to which a control is bound and determines how a control is resized with its parent.

(Inherited from Control) AutoScrollOffset

Gets or sets where this control is scrolled to in ScrollControlIntoView(Control).

(Inherited from Control) AutoSize

This property is not relevant for this class.

(Inherited from Control) BackColor

Gets or sets the background color for the control.

This property is not relevant to this class.

Gets or sets the background image layout for a ListBox as defined in the ImageLayout enumeration.

Gets or sets the background image layout as defined in the ImageLayout enumeration.

(Inherited from Control) BindingContext

Gets or sets the BindingContext for the control.

(Inherited from Control) BorderStyle

Gets or sets the type of border that is drawn around the ListBox.

Gets the distance, in pixels, between the bottom edge of the control and the top edge of its container’s client area.

(Inherited from Control) Bounds

Gets or sets the size and location of the control including its nonclient elements, in pixels, relative to the parent control.

(Inherited from Control) CanEnableIme

Gets a value indicating whether the ImeMode property can be set to an active value, to enable IME support.

(Inherited from Control) CanFocus

Gets a value indicating whether the control can receive focus.

(Inherited from Control) CanRaiseEvents

Determines if events can be raised on the control.

(Inherited from Control) CanSelect

Gets a value indicating whether the control can be selected.

(Inherited from Control) Capture

Gets or sets a value indicating whether the control has captured the mouse.

(Inherited from Control) CausesValidation

Gets or sets a value indicating whether the control causes validation to be performed on any controls that require validation when it receives focus.

(Inherited from Control) ClientRectangle

Gets the rectangle that represents the client area of the control.

(Inherited from Control) ClientSize

Gets or sets the height and width of the client area of the control.

(Inherited from Control) ColumnWidth

Gets or sets the width of columns in a multicolumn ListBox.

Gets the name of the company or creator of the application containing the control.

(Inherited from Control) Container

Gets the IContainer that contains the Component.

(Inherited from Component) ContainsFocus

Gets a value indicating whether the control, or one of its child controls, currently has the input focus.

(Inherited from Control) ContextMenu

Gets or sets the shortcut menu associated with the control.

(Inherited from Control) ContextMenuStrip

Gets or sets the ContextMenuStrip associated with this control.

(Inherited from Control) Controls

Gets the collection of controls contained within the control.

(Inherited from Control) Created

Gets a value indicating whether the control has been created.

(Inherited from Control) CreateParams

Gets the required creation parameters when the control handle is created.

Gets or sets the cursor that is displayed when the mouse pointer is over the control.

(Inherited from Control) CustomTabOffsets

Gets the width of the tabs between the items in the ListBox.

Gets the data bindings for the control.

(Inherited from Control) DataManager

Gets the CurrencyManager associated with this control.

(Inherited from ListControl) DataSource

Gets or sets the data source for this ListControl.

(Inherited from ListControl) DefaultCursor

Gets or sets the default cursor for the control.

(Inherited from Control) DefaultImeMode

Gets the default Input Method Editor (IME) mode supported by the control.

(Inherited from Control) DefaultMargin

Gets the space, in pixels, that is specified by default between controls.

(Inherited from Control) DefaultMaximumSize

Gets the length and height, in pixels, that is specified as the default maximum size of a control.

(Inherited from Control) DefaultMinimumSize

Gets the length and height, in pixels, that is specified as the default minimum size of a control.

(Inherited from Control) DefaultPadding

Gets the internal spacing, in pixels, of the contents of a control.

(Inherited from Control) DefaultSize

Gets the default size of the control.

Gets a value that indicates whether the Component is currently in design mode.

(Inherited from Component) DeviceDpi

Gets the DPI value for the display device where the control is currently being displayed.

(Inherited from Control) DisplayMember

Gets or sets the property to display for this ListControl.

(Inherited from ListControl) DisplayRectangle

Gets the rectangle that represents the display area of the control.

(Inherited from Control) Disposing

Gets a value indicating whether the base Control class is in the process of disposing.

(Inherited from Control) Dock

Gets or sets which control borders are docked to its parent control and determines how a control is resized with its parent.

(Inherited from Control) DoubleBuffered

Gets or sets a value indicating whether this control should redraw its surface using a secondary buffer to reduce or prevent flicker.

(Inherited from Control) DrawMode

Gets or sets the drawing mode for the control.

Gets or sets a value indicating whether the control can respond to user interaction.

(Inherited from Control) Events

Gets the list of event handlers that are attached to this Component.

(Inherited from Component) Focused

Gets a value indicating whether the control has input focus.

(Inherited from Control) Font

Gets or sets the font of the text displayed by the control.

Gets or sets the font of the text displayed by the control.

(Inherited from Control) FontHeight

Gets or sets the height of the font of the control.

(Inherited from Control) ForeColor

Gets or sets the foreground color of the control.

Gets or sets the IFormatProvider that provides custom formatting behavior.

(Inherited from ListControl) FormatString

Gets or sets the format-specifier characters that indicate how a value is to be displayed.

(Inherited from ListControl) FormattingEnabled

Gets or sets a value indicating whether formatting is applied to the DisplayMember property of the ListControl.

(Inherited from ListControl) Handle

Gets the window handle that the control is bound to.

(Inherited from Control) HasChildren

Gets a value indicating whether the control contains one or more child controls.

(Inherited from Control) Height

Gets or sets the height of the control.

(Inherited from Control) HorizontalExtent

Gets or sets the width by which the horizontal scroll bar of a ListBox can scroll.

Gets or sets a value indicating whether a horizontal scroll bar is displayed in the control.

Gets or sets the Input Method Editor (IME) mode of the control.

(Inherited from Control) ImeModeBase

Gets or sets the IME mode of a control.

(Inherited from Control) IntegralHeight

Gets or sets a value indicating whether the control should resize to avoid showing partial items.

Gets a value indicating whether the caller must call an invoke method when making method calls to the control because the caller is on a different thread than the one the control was created on.

(Inherited from Control) IsAccessible

Gets or sets a value indicating whether the control is visible to accessibility applications.

(Inherited from Control) IsDisposed

Gets a value indicating whether the control has been disposed of.

(Inherited from Control) IsHandleCreated

Gets a value indicating whether the control has a handle associated with it.

(Inherited from Control) IsMirrored

Gets a value indicating whether the control is mirrored.

(Inherited from Control) ItemHeight

Gets or sets the height of an item in the ListBox.

Gets the items of the ListBox.

Gets a cached instance of the control’s layout engine.

(Inherited from Control) Left

Gets or sets the distance, in pixels, between the left edge of the control and the left edge of its container’s client area.

(Inherited from Control) Location

Gets or sets the coordinates of the upper-left corner of the control relative to the upper-left corner of its container.

(Inherited from Control) Margin

Gets or sets the space between controls.

(Inherited from Control) MaximumSize

Gets or sets the size that is the upper limit that GetPreferredSize(Size) can specify.

(Inherited from Control) MinimumSize

Gets or sets the size that is the lower limit that GetPreferredSize(Size) can specify.

(Inherited from Control) MultiColumn

Gets or sets a value indicating whether the ListBox supports multiple columns.

Gets or sets the name of the control.

(Inherited from Control) Padding

This property is not relevant to this class.

Gets or sets padding within the control.

(Inherited from Control) Parent

Gets or sets the parent container of the control.

(Inherited from Control) PreferredHeight

Gets the combined height of all items in the ListBox.

Gets the size of a rectangular area into which the control can fit.

(Inherited from Control) ProductName

Gets the product name of the assembly containing the control.

(Inherited from Control) ProductVersion

Gets the version of the assembly containing the control.

(Inherited from Control) RecreatingHandle

Gets a value indicating whether the control is currently re-creating its handle.

(Inherited from Control) Region

Gets or sets the window region associated with the control.

(Inherited from Control) RenderRightToLeft

This property is now obsolete.

(Inherited from Control) ResizeRedraw

Gets or sets a value indicating whether the control redraws itself when resized.

(Inherited from Control) Right

Gets the distance, in pixels, between the right edge of the control and the left edge of its container’s client area.

(Inherited from Control) RightToLeft

Gets or sets a value indicating whether text displayed by the control is displayed from right to left.

Gets or sets a value indicating whether control’s elements are aligned to support locales using right-to-left fonts.

(Inherited from Control) ScaleChildren

Gets a value that determines the scaling of child controls.

(Inherited from Control) ScrollAlwaysVisible

Gets or sets a value indicating whether the vertical scroll bar is shown at all times.

Gets or sets the zero-based index of the currently selected item in a ListBox.

Gets a collection that contains the zero-based indexes of all currently selected items in the ListBox.

Gets or sets the currently selected item in the ListBox.

Gets a collection containing the currently selected items in the ListBox.

Gets or sets the value of the member property specified by the ValueMember property.

(Inherited from ListControl) SelectionMode

Gets or sets the method in which items are selected in the ListBox.

Gets a value indicating whether the control should display focus rectangles.

(Inherited from Control) ShowKeyboardCues

Gets a value indicating whether the user interface is in the appropriate state to show or hide keyboard accelerators.

(Inherited from Control) Site

Gets or sets the site of the control.

(Inherited from Control) Size

Gets or sets the height and width of the control.

(Inherited from Control) Sorted

Gets or sets a value indicating whether the items in the ListBox are sorted alphabetically.

Gets or sets the tab order of the control within its container.

(Inherited from Control) TabStop

Gets or sets a value indicating whether the user can give the focus to this control using the TAB key.

(Inherited from Control) Tag

Gets or sets the object that contains data about the control.

(Inherited from Control) Text

Gets or searches for the text of the currently selected item in the ListBox.

Gets or sets the distance, in pixels, between the top edge of the control and the top edge of its container’s client area.

(Inherited from Control) TopIndex

Gets or sets the index of the first visible item in the ListBox.

Gets the parent control that is not parented by another Windows Forms control. Typically, this is the outermost Form that the control is contained in.

(Inherited from Control) UseCustomTabOffsets

Gets or sets a value indicating whether the ListBox recognizes and expands tab characters when it draws its strings by using the CustomTabOffsets integer array.

Gets or sets a value indicating whether the ListBox can recognize and expand tab characters when drawing its strings.

Gets or sets a value indicating whether to use the wait cursor for the current control and all child controls.

(Inherited from Control) ValueMember

Gets or sets the path of the property to use as the actual value for the items in the ListControl.

(Inherited from ListControl) Visible

Gets or sets a value indicating whether the control and all its child controls are displayed.

(Inherited from Control) Width

Gets or sets the width of the control.

(Inherited from Control) WindowTarget

This property is not relevant for this class.

(Inherited from Control)

Methods

Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control.

(Inherited from Control) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32)

Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control .

(Inherited from Control) AddItemsCore(Object[])

This member is obsolete, and there is no replacement.

Executes the specified delegate asynchronously on the thread that the control’s underlying handle was created on.

(Inherited from Control) BeginInvoke(Delegate, Object[])

Executes the specified delegate asynchronously with the specified arguments, on the thread that the control’s underlying handle was created on.

(Inherited from Control) BeginUpdate()

Maintains performance while items are added to the ListBox one at a time by preventing the control from drawing until the EndUpdate() method is called.

Brings the control to the front of the z-order.

(Inherited from Control) ClearSelected()

Unselects all items in the ListBox.

Retrieves a value indicating whether the specified control is a child of the control.

(Inherited from Control) CreateAccessibilityInstance()

Creates a new accessibility object for this control.

Creates a new accessibility object for the control.

(Inherited from Control) CreateControl()

Forces the creation of the visible control, including the creation of the handle and any visible child controls.

(Inherited from Control) CreateControlsInstance()

Creates a new instance of the control collection for the control.

(Inherited from Control) CreateGraphics()

Creates the Graphics for the control.

(Inherited from Control) CreateHandle()

Creates a handle for the control.

(Inherited from Control) CreateItemCollection()

Creates a new instance of the item collection.

Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.

(Inherited from MarshalByRefObject) DefWndProc(Message)

Sends the specified message to the default window procedure.

(Inherited from Control) DestroyHandle()

Destroys the handle associated with the control.

(Inherited from Control) Dispose()

Releases all resources used by the Component.

(Inherited from Component) Dispose(Boolean)

Releases the unmanaged resources used by the Control and its child controls and optionally releases the managed resources.

(Inherited from Control) DoDragDrop(Object, DragDropEffects)

Begins a drag-and-drop operation.

(Inherited from Control) DrawToBitmap(Bitmap, Rectangle)

Supports rendering to the specified bitmap.

(Inherited from Control) EndInvoke(IAsyncResult)

Retrieves the return value of the asynchronous operation represented by the IAsyncResult passed.

(Inherited from Control) EndUpdate()

Resumes painting the ListBox control after painting is suspended by the BeginUpdate() method.

Determines whether the specified object is equal to the current object.

(Inherited from Object) FilterItemOnProperty(Object)

Retrieves the current value of the ListControl item, if it is a property of an object, given the item.

(Inherited from ListControl) FilterItemOnProperty(Object, String)

Returns the current value of the ListControl item, if it is a property of an object given the item and the property name.

(Inherited from ListControl) FindForm()

Retrieves the form that the control is on.

(Inherited from Control) FindString(String)

Finds the first item in the ListBox that starts with the specified string.

Finds the first item in the ListBox that starts with the specified string. The search starts at a specific starting index.

Finds the first item in the ListBox that exactly matches the specified string.

Finds the first item in the ListBox that exactly matches the specified string. The search starts at a specific starting index.

Sets input focus to the control.

(Inherited from Control) GetAccessibilityObjectById(Int32)

Retrieves the specified AccessibleObject.

(Inherited from Control) GetAutoSizeMode()

Retrieves a value indicating how a control will behave when its AutoSize property is enabled.

(Inherited from Control) GetChildAtPoint(Point)

Retrieves the child control that is located at the specified coordinates.

(Inherited from Control) GetChildAtPoint(Point, GetChildAtPointSkip)

Retrieves the child control that is located at the specified coordinates, specifying whether to ignore child controls of a certain type.

(Inherited from Control) GetContainerControl()

Returns the next ContainerControl up the control’s chain of parent controls.

(Inherited from Control) GetHashCode()

Serves as the default hash function.

(Inherited from Object) GetItemHeight(Int32)

Returns the height of an item in the ListBox.

Returns the bounding rectangle for an item in the ListBox.

Returns the text representation of the specified item.

(Inherited from ListControl) GetLifetimeService()

Retrieves the current lifetime service object that controls the lifetime policy for this instance.

(Inherited from MarshalByRefObject) GetNextControl(Control, Boolean)

Retrieves the next control forward or back in the tab order of child controls.

(Inherited from Control) GetPreferredSize(Size)

Retrieves the size of a rectangular area into which a control can be fitted.

(Inherited from Control) GetScaledBounds(Rectangle, SizeF, BoundsSpecified)

Retrieves the bounds within which the ListBox is scaled.

Retrieves the bounds within which the control is scaled.

(Inherited from Control) GetSelected(Int32)

Returns a value indicating whether the specified item is selected.

Returns an object that represents a service provided by the Component or by its Container.

(Inherited from Component) GetStyle(ControlStyles)

Retrieves the value of the specified control style bit for the control.

(Inherited from Control) GetTopLevel()

Determines if the control is a top-level control.

(Inherited from Control) GetType()

Gets the Type of the current instance.

(Inherited from Object) Hide()

Conceals the control from the user.

(Inherited from Control) IndexFromPoint(Int32, Int32)

Returns the zero-based index of the item at the specified coordinates.

Returns the zero-based index of the item at the specified coordinates.

Obtains a lifetime service object to control the lifetime policy for this instance.

(Inherited from MarshalByRefObject) InitLayout()

Called after the control has been added to another container.

(Inherited from Control) Invalidate()

Invalidates the entire surface of the control and causes the control to be redrawn.

(Inherited from Control) Invalidate(Boolean)

Invalidates a specific region of the control and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control.

(Inherited from Control) Invalidate(Rectangle)

Invalidates the specified region of the control (adds it to the control’s update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

(Inherited from Control) Invalidate(Rectangle, Boolean)

Invalidates the specified region of the control (adds it to the control’s update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control.

(Inherited from Control) Invalidate(Region)

Invalidates the specified region of the control (adds it to the control’s update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

(Inherited from Control) Invalidate(Region, Boolean)

Invalidates the specified region of the control (adds it to the control’s update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control.

(Inherited from Control) Invoke(Delegate)

Executes the specified delegate on the thread that owns the control’s underlying window handle.

(Inherited from Control) Invoke(Delegate, Object[])

Executes the specified delegate, on the thread that owns the control’s underlying window handle, with the specified list of arguments.

(Inherited from Control) InvokeGotFocus(Control, EventArgs)

Raises the GotFocus event for the specified control.

(Inherited from Control) InvokeLostFocus(Control, EventArgs)

Raises the LostFocus event for the specified control.

(Inherited from Control) InvokeOnClick(Control, EventArgs)

Raises the Click event for the specified control.

(Inherited from Control) InvokePaint(Control, PaintEventArgs)

Raises the Paint event for the specified control.

(Inherited from Control) InvokePaintBackground(Control, PaintEventArgs)

Raises the PaintBackground event for the specified control.

(Inherited from Control) IsInputChar(Char)

Determines if a character is an input character that the control recognizes.

(Inherited from Control) IsInputKey(Keys)

Handles special input keys, such as PAGE UP, PAGE DOWN, HOME, END, and so on.

(Inherited from ListControl) LogicalToDeviceUnits(Int32)

Converts a Logical DPI value to its equivalent DeviceUnit DPI value.

(Inherited from Control) LogicalToDeviceUnits(Size)

Transforms a size from logical to device units by scaling it for the current DPI and rounding down to the nearest integer value for width and height.

(Inherited from Control) MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object) MemberwiseClone(Boolean)

Creates a shallow copy of the current MarshalByRefObject object.

(Inherited from MarshalByRefObject) NotifyInvalidate(Rectangle)

Raises the Invalidated event with a specified region of the control to invalidate.

(Inherited from Control) OnAutoSizeChanged(EventArgs)

(Inherited from Control) OnBackColorChanged(EventArgs)

(Inherited from Control) OnBackgroundImageChanged(EventArgs)

(Inherited from Control) OnBackgroundImageLayoutChanged(EventArgs)

(Inherited from Control) OnBindingContextChanged(EventArgs)

(Inherited from ListControl) OnCausesValidationChanged(EventArgs)

(Inherited from Control) OnChangeUICues(UICuesEventArgs)

Raises the ChangeUICues event.

Raises the Click event.

(Inherited from Control) OnClientSizeChanged(EventArgs)

(Inherited from Control) OnContextMenuChanged(EventArgs)

(Inherited from Control) OnContextMenuStripChanged(EventArgs)

(Inherited from Control) OnControlAdded(ControlEventArgs)

Raises the ControlAdded event.

(Inherited from Control) OnControlRemoved(ControlEventArgs)

(Inherited from Control) OnCreateControl()

(Inherited from Control) OnCursorChanged(EventArgs)

(Inherited from Control) OnDataSourceChanged(EventArgs)

Raises the DockChanged event.

(Inherited from Control) OnDoubleClick(EventArgs)

Raises the DoubleClick event.

(Inherited from Control) OnDpiChangedAfterParent(EventArgs)

(Inherited from Control) OnDpiChangedBeforeParent(EventArgs)

(Inherited from Control) OnDragDrop(DragEventArgs)

Raises the DragDrop event.

(Inherited from Control) OnDragEnter(DragEventArgs)

Raises the DragEnter event.

(Inherited from Control) OnDragLeave(EventArgs)

Raises the DragLeave event.

(Inherited from Control) OnDragOver(DragEventArgs)

Raises the DragOver event.

(Inherited from Control) OnDrawItem(DrawItemEventArgs)

Raises the DrawItem event.

(Inherited from Control) OnEnter(EventArgs)

Raises the Enter event.

(Inherited from Control) OnFontChanged(EventArgs)

Raises the FontChanged event.

(Inherited from Control) OnFormat(ListControlConvertEventArgs)

Raises the Format event.

(Inherited from ListControl) OnFormatInfoChanged(EventArgs)

(Inherited from ListControl) OnFormatStringChanged(EventArgs)

(Inherited from ListControl) OnFormattingEnabledChanged(EventArgs)

(Inherited from ListControl) OnGiveFeedback(GiveFeedbackEventArgs)

Raises the GiveFeedback event.

(Inherited from Control) OnGotFocus(EventArgs)

Raises the GotFocus event.

Raises the GotFocus event.

(Inherited from Control) OnHandleCreated(EventArgs)

Specifies when the window handle has been created so that column width and other characteristics can be set. Inheriting classes should call base.OnHandleCreated .

Overridden to be sure that items are set up and cleared out correctly. Inheriting controls should call base.OnHandleDestroyed .

(Inherited from Control) OnImeModeChanged(EventArgs)

(Inherited from Control) OnInvalidated(InvalidateEventArgs)

Raises the Invalidated event.

(Inherited from Control) OnKeyDown(KeyEventArgs)

Raises the KeyDown event.

(Inherited from Control) OnKeyPress(KeyPressEventArgs)

Raises the KeyPress event.

(Inherited from Control) OnKeyUp(KeyEventArgs)

Raises the KeyUp event.

(Inherited from Control) OnLayout(LayoutEventArgs)

Raises the Layout event.

(Inherited from Control) OnLeave(EventArgs)

Raises the Leave event.

(Inherited from Control) OnLocationChanged(EventArgs)

(Inherited from Control) OnLostFocus(EventArgs)

Raises the LostFocus event.

(Inherited from Control) OnMarginChanged(EventArgs)

(Inherited from Control) OnMeasureItem(MeasureItemEventArgs)

Raises the MeasureItem event.

(Inherited from Control) OnMouseClick(MouseEventArgs)

Raises the MouseClick event.

(Inherited from Control) OnMouseDoubleClick(MouseEventArgs)

(Inherited from Control) OnMouseDown(MouseEventArgs)

Raises the MouseDown event.

(Inherited from Control) OnMouseEnter(EventArgs)

Raises the MouseEnter event.

(Inherited from Control) OnMouseHover(EventArgs)

Raises the MouseHover event.

(Inherited from Control) OnMouseLeave(EventArgs)

Raises the MouseLeave event.

(Inherited from Control) OnMouseMove(MouseEventArgs)

Raises the MouseMove event.

(Inherited from Control) OnMouseUp(MouseEventArgs)

Raises the MouseUp event.

(Inherited from Control) OnMouseWheel(MouseEventArgs)

Raises the MouseWheel event.

(Inherited from Control) OnMove(EventArgs)

Raises the Move event.

(Inherited from Control) OnNotifyMessage(Message)

Notifies the control of Windows messages.

(Inherited from Control) OnPaddingChanged(EventArgs)

(Inherited from Control) OnPaint(PaintEventArgs)

Raises the Paint event.

(Inherited from Control) OnPaintBackground(PaintEventArgs)

Paints the background of the control.

(Inherited from Control) OnParentBackColorChanged(EventArgs)

Raises the BackColorChanged event when the BackColor property value of the control’s container changes.

(Inherited from Control) OnParentBackgroundImageChanged(EventArgs)

Raises the BackgroundImageChanged event when the BackgroundImage property value of the control’s container changes.

(Inherited from Control) OnParentBindingContextChanged(EventArgs)

Raises the BindingContextChanged event when the BindingContext property value of the control’s container changes.

(Inherited from Control) OnParentChanged(EventArgs)

(Inherited from Control) OnParentEnabledChanged(EventArgs)

Raises the EnabledChanged event when the Enabled property value of the control’s container changes.

(Inherited from Control) OnParentFontChanged(EventArgs)

Raises the FontChanged event when the Font property value of the control’s container changes.

(Inherited from Control) OnParentForeColorChanged(EventArgs)

Raises the ForeColorChanged event when the ForeColor property value of the control’s container changes.

(Inherited from Control) OnParentRightToLeftChanged(EventArgs)

Raises the RightToLeftChanged event when the RightToLeft property value of the control’s container changes.

(Inherited from Control) OnParentVisibleChanged(EventArgs)

Raises the VisibleChanged event when the Visible property value of the control’s container changes.

(Inherited from Control) OnPreviewKeyDown(PreviewKeyDownEventArgs)

(Inherited from Control) OnPrint(PaintEventArgs)

Raises the Paint event.

(Inherited from Control) OnQueryContinueDrag(QueryContinueDragEventArgs)

(Inherited from Control) OnRegionChanged(EventArgs)

(Inherited from Control) OnResize(EventArgs)

Raises the Resize event.

(Inherited from Control) OnSelectedIndexChanged(EventArgs)

Raises the SizeChanged event.

(Inherited from Control) OnStyleChanged(EventArgs)

Raises the StyleChanged event.

(Inherited from Control) OnSystemColorsChanged(EventArgs)

(Inherited from Control) OnTabIndexChanged(EventArgs)

(Inherited from Control) OnTabStopChanged(EventArgs)

(Inherited from Control) OnTextChanged(EventArgs)

Raises the TextChanged event.

(Inherited from Control) OnValidated(EventArgs)

Raises the Validated event.

(Inherited from Control) OnValidating(CancelEventArgs)

Raises the Validating event.

(Inherited from Control) OnValueMemberChanged(EventArgs)

(Inherited from ListControl) OnVisibleChanged(EventArgs)

(Inherited from Control) PerformLayout()

Forces the control to apply layout logic to all its child controls.

(Inherited from Control) PerformLayout(Control, String)

Forces the control to apply layout logic to all its child controls.

(Inherited from Control) PointToClient(Point)

Computes the location of the specified screen point into client coordinates.

(Inherited from Control) PointToScreen(Point)

Computes the location of the specified client point into screen coordinates.

(Inherited from Control) PreProcessControlMessage(Message)

Preprocesses keyboard or input messages within the message loop before they are dispatched.

(Inherited from Control) PreProcessMessage(Message)

Preprocesses keyboard or input messages within the message loop before they are dispatched.

(Inherited from Control) ProcessCmdKey(Message, Keys)

Processes a command key.

(Inherited from Control) ProcessDialogChar(Char)

Processes a dialog character.

(Inherited from Control) ProcessDialogKey(Keys)

Processes a dialog key.

(Inherited from Control) ProcessKeyEventArgs(Message)

Processes a key message and generates the appropriate control events.

(Inherited from Control) ProcessKeyMessage(Message)

Processes a keyboard message.

(Inherited from Control) ProcessKeyPreview(Message)

Previews a keyboard message.

(Inherited from Control) ProcessMnemonic(Char)

Processes a mnemonic character.

(Inherited from Control) RaiseDragEvent(Object, DragEventArgs)

Raises the appropriate drag event.

(Inherited from Control) RaiseKeyEvent(Object, KeyEventArgs)

Raises the appropriate key event.

(Inherited from Control) RaiseMouseEvent(Object, MouseEventArgs)

Raises the appropriate mouse event.

(Inherited from Control) RaisePaintEvent(Object, PaintEventArgs)

Raises the appropriate paint event.

(Inherited from Control) RecreateHandle()

Forces the re-creation of the handle for the control.

(Inherited from Control) RectangleToClient(Rectangle)

Computes the size and location of the specified screen rectangle in client coordinates.

(Inherited from Control) RectangleToScreen(Rectangle)

Computes the size and location of the specified client rectangle in screen coordinates.

(Inherited from Control) Refresh()

Forces the control to invalidate its client area and immediately redraw itself and any child controls.

Refreshes the item contained at the specified index.

Refreshes all ListBox items and retrieves new strings for them.

When overridden in a derived class, resynchronizes the item data with the contents of the data source.

(Inherited from ListControl) RescaleConstantsForDpi(Int32, Int32)

Provides constants for rescaling the control when a DPI change occurs.

Provides constants for rescaling the control when a DPI change occurs.

(Inherited from Control) ResetBackColor()

Resets the BackColor property to its default value.

Resets the BackColor property to its default value.

(Inherited from Control) ResetBindings()

Causes a control bound to the BindingSource to reread all the items in the list and refresh their displayed values.

(Inherited from Control) ResetCursor()

Resets the Cursor property to its default value.

(Inherited from Control) ResetFont()

Resets the Font property to its default value.

(Inherited from Control) ResetForeColor()

Resets the ForeColor property to its default value.

Resets the ForeColor property to its default value.

(Inherited from Control) ResetImeMode()

Resets the ImeMode property to its default value.

(Inherited from Control) ResetMouseEventArgs()

Resets the control to handle the MouseLeave event.

(Inherited from Control) ResetRightToLeft()

Resets the RightToLeft property to its default value.

(Inherited from Control) ResetText()

Resets the Text property to its default value (Empty).

(Inherited from Control) ResumeLayout()

Resumes usual layout logic.

(Inherited from Control) ResumeLayout(Boolean)

Resumes usual layout logic, optionally forcing an immediate layout of pending layout requests.

(Inherited from Control) RtlTranslateAlignment(ContentAlignment)

Converts the specified ContentAlignment to the appropriate ContentAlignment to support right-to-left text.

(Inherited from Control) RtlTranslateAlignment(HorizontalAlignment)

Converts the specified HorizontalAlignment to the appropriate HorizontalAlignment to support right-to-left text.

(Inherited from Control) RtlTranslateAlignment(LeftRightAlignment)

Converts the specified LeftRightAlignment to the appropriate LeftRightAlignment to support right-to-left text.

(Inherited from Control) RtlTranslateContent(ContentAlignment)

Converts the specified ContentAlignment to the appropriate ContentAlignment to support right-to-left text.

(Inherited from Control) RtlTranslateHorizontal(HorizontalAlignment)

Converts the specified HorizontalAlignment to the appropriate HorizontalAlignment to support right-to-left text.

(Inherited from Control) RtlTranslateLeftRight(LeftRightAlignment)

Converts the specified LeftRightAlignment to the appropriate LeftRightAlignment to support right-to-left text.

(Inherited from Control) Scale(Single)

Scales the control and any child controls.

(Inherited from Control) Scale(Single, Single)

Scales the entire control and any child controls.

(Inherited from Control) Scale(SizeF)

Scales the control and all child controls by the specified scaling factor.

(Inherited from Control) ScaleBitmapLogicalToDevice(Bitmap)

Scales a logical bitmap value to it’s equivalent device unit value when a DPI change occurs.

(Inherited from Control) ScaleControl(SizeF, BoundsSpecified)

Scales a control’s location, size, padding and margin.

Scales a control’s location, size, padding and margin.

(Inherited from Control) ScaleCore(Single, Single)

This method is not relevant for this class.

(Inherited from Control) Select()

Activates the control.

(Inherited from Control) Select(Boolean, Boolean)

Activates a child control. Optionally specifies the direction in the tab order to select the control from.

(Inherited from Control) SelectNextControl(Control, Boolean, Boolean, Boolean, Boolean)

Activates the next control.

(Inherited from Control) SendToBack()

Sends the control to the back of the z-order.

(Inherited from Control) SetAutoSizeMode(AutoSizeMode)

Sets a value indicating how a control will behave when its AutoSize property is enabled.

(Inherited from Control) SetBounds(Int32, Int32, Int32, Int32)

Sets the bounds of the control to the specified location and size.

(Inherited from Control) SetBounds(Int32, Int32, Int32, Int32, BoundsSpecified)

Sets the specified bounds of the control to the specified location and size.

(Inherited from Control) SetBoundsCore(Int32, Int32, Int32, Int32, BoundsSpecified)

Sets the specified bounds of the ListBox control.

Sets the size of the client area of the control.

(Inherited from Control) SetItemCore(Int32, Object)

Sets the object with the specified index in the derived class.

Clears the contents of the ListBox and adds the specified items to the control.

Selects or clears the selection for the specified item in a ListBox.

Sets a specified ControlStyles flag to either true or false .

(Inherited from Control) SetTopLevel(Boolean)

Sets the control as the top-level control.

(Inherited from Control) SetVisibleCore(Boolean)

Sets the control to the specified visible state.

(Inherited from Control) Show()

Displays the control to the user.

(Inherited from Control) SizeFromClientSize(Size)

Determines the size of the entire control from the height and width of its client area.

(Inherited from Control) Sort()

Sorts the items in the ListBox.

Temporarily suspends the layout logic for the control.

(Inherited from Control) ToString()

Returns a string representation of the ListBox.

Causes the control to redraw the invalidated regions within its client area.

(Inherited from Control) UpdateBounds()

Updates the bounds of the control with the current size and location.

(Inherited from Control) UpdateBounds(Int32, Int32, Int32, Int32)

Updates the bounds of the control with the specified size and location.

(Inherited from Control) UpdateBounds(Int32, Int32, Int32, Int32, Int32, Int32)

Updates the bounds of the control with the specified size, location, and client size.

(Inherited from Control) UpdateStyles()

Forces the assigned styles to be reapplied to the control.

(Inherited from Control) UpdateZOrder()

Updates the control in its parent’s z-order.

(Inherited from Control) WmReflectCommand(Message)

Processes the command message the ListView control receives from the top-level window.

The list’s window procedure.

Events

This event is not relevant for this class.

(Inherited from Control) BackColorChanged

Occurs when the value of the BackColor property changes.

(Inherited from Control) BackgroundImageChanged

Occurs when the BackgroundImage property of the label changes.

Occurs when the BackgroundImageLayout property changes.

Occurs when the BackgroundImageLayout property changes.

(Inherited from Control) BindingContextChanged

Occurs when the value of the BindingContext property changes.

(Inherited from Control) CausesValidationChanged

Occurs when the value of the CausesValidation property changes.

(Inherited from Control) ChangeUICues

Occurs when the focus or keyboard user interface (UI) cues change.

(Inherited from Control) Click

Occurs when the ListBox control is clicked.

Occurs when the value of the ClientSize property changes.

(Inherited from Control) ContextMenuChanged

Occurs when the value of the ContextMenu property changes.

(Inherited from Control) ContextMenuStripChanged

Occurs when the value of the ContextMenuStrip property changes.

(Inherited from Control) ControlAdded

Occurs when a new control is added to the Control.ControlCollection.

(Inherited from Control) ControlRemoved

Occurs when a control is removed from the Control.ControlCollection.

(Inherited from Control) CursorChanged

Occurs when the value of the Cursor property changes.

(Inherited from Control) DataSourceChanged

Occurs when the DataSource changes.

(Inherited from ListControl) DisplayMemberChanged

Occurs when the DisplayMember property changes.

(Inherited from ListControl) Disposed

Occurs when the component is disposed by a call to the Dispose() method.

(Inherited from Component) DockChanged

Occurs when the value of the Dock property changes.

(Inherited from Control) DoubleClick

Occurs when the control is double-clicked.

(Inherited from Control) DpiChangedAfterParent

Occurs when the DPI setting for a control is changed programmatically after the DPI of its parent control or form has changed.

(Inherited from Control) DpiChangedBeforeParent

Occurs when the DPI setting for a control is changed programmatically before a DPI change event for its parent control or form has occurred.

(Inherited from Control) DragDrop

Occurs when a drag-and-drop operation is completed.

(Inherited from Control) DragEnter

Occurs when an object is dragged into the control’s bounds.

(Inherited from Control) DragLeave

Occurs when an object is dragged out of the control’s bounds.

(Inherited from Control) DragOver

Occurs when an object is dragged over the control’s bounds.

(Inherited from Control) DrawItem

Occurs when a visual aspect of an owner-drawn ListBox changes.

Occurs when the Enabled property value has changed.

(Inherited from Control) Enter

Occurs when the control is entered.

(Inherited from Control) FontChanged

Occurs when the Font property value changes.

(Inherited from Control) ForeColorChanged

Occurs when the ForeColor property value changes.

(Inherited from Control) Format

Occurs when the control is bound to a data value.

(Inherited from ListControl) FormatInfoChanged

Occurs when the value of the FormatInfo property changes.

(Inherited from ListControl) FormatStringChanged

Occurs when value of the FormatString property changes.

(Inherited from ListControl) FormattingEnabledChanged

Occurs when the value of the FormattingEnabled property changes.

(Inherited from ListControl) GiveFeedback

Occurs during a drag operation.

(Inherited from Control) GotFocus

Occurs when the control receives focus.

(Inherited from Control) HandleCreated

Occurs when a handle is created for the control.

(Inherited from Control) HandleDestroyed

Occurs when the control’s handle is in the process of being destroyed.

(Inherited from Control) HelpRequested

Occurs when the user requests help for a control.

(Inherited from Control) ImeModeChanged

Occurs when the ImeMode property has changed.

(Inherited from Control) Invalidated

Occurs when a control’s display requires redrawing.

(Inherited from Control) KeyDown

Occurs when a key is pressed while the control has focus.

(Inherited from Control) KeyPress

Occurs when a character. space or backspace key is pressed while the control has focus.

(Inherited from Control) KeyUp

Occurs when a key is released while the control has focus.

(Inherited from Control) Layout

Occurs when a control should reposition its child controls.

(Inherited from Control) Leave

Occurs when the input focus leaves the control.

(Inherited from Control) LocationChanged

Occurs when the Location property value has changed.

(Inherited from Control) LostFocus

Occurs when the control loses focus.

(Inherited from Control) MarginChanged

Occurs when the control’s margin changes.

(Inherited from Control) MeasureItem

Occurs when an owner-drawn ListBox is created and the sizes of the list items are determined.

Occurs when the control loses mouse capture.

(Inherited from Control) MouseClick

Occurs when the user clicks the ListBox control with the mouse pointer.

Occurs when the control is clicked by the mouse.

(Inherited from Control) MouseDoubleClick

Occurs when the control is double clicked by the mouse.

(Inherited from Control) MouseDown

Occurs when the mouse pointer is over the control and a mouse button is pressed.

(Inherited from Control) MouseEnter

Occurs when the mouse pointer enters the control.

(Inherited from Control) MouseHover

Occurs when the mouse pointer rests on the control.

(Inherited from Control) MouseLeave

Occurs when the mouse pointer leaves the control.

(Inherited from Control) MouseMove

Occurs when the mouse pointer is moved over the control.

(Inherited from Control) MouseUp

Occurs when the mouse pointer is over the control and a mouse button is released.

(Inherited from Control) MouseWheel

Occurs when the mouse wheel moves while the control has focus.

(Inherited from Control) Move

Occurs when the control is moved.

(Inherited from Control) PaddingChanged

Occurs when the value of the Padding property changes.

Occurs when the control’s padding changes.

(Inherited from Control) Paint

Occurs when the ListBox control is painted.

Occurs when the Parent property value changes.

(Inherited from Control) PreviewKeyDown

Occurs before the KeyDown event when a key is pressed while focus is on this control.

(Inherited from Control) QueryAccessibilityHelp

Occurs when AccessibleObject is providing help to accessibility applications.

(Inherited from Control) QueryContinueDrag

Occurs during a drag-and-drop operation and enables the drag source to determine whether the drag-and-drop operation should be canceled.

(Inherited from Control) RegionChanged

Occurs when the value of the Region property changes.

(Inherited from Control) Resize

Occurs when the control is resized.

(Inherited from Control) RightToLeftChanged

Occurs when the RightToLeft property value changes.

(Inherited from Control) SelectedIndexChanged

Occurs when the SelectedIndex property or the SelectedIndices collection has changed.

Occurs when the SelectedValue property changes.

(Inherited from ListControl) SizeChanged

Occurs when the Size property value changes.

(Inherited from Control) StyleChanged

Occurs when the control style changes.

(Inherited from Control) SystemColorsChanged

Occurs when the system colors change.

(Inherited from Control) TabIndexChanged

Occurs when the TabIndex property value changes.

(Inherited from Control) TabStopChanged

Occurs when the TabStop property value changes.

(Inherited from Control) TextChanged

Occurs when the Text property is changed.

Occurs when the control is finished validating.

(Inherited from Control) Validating

Occurs when the control is validating.

(Inherited from Control) ValueMemberChanged

Occurs when the ValueMember property changes.

(Inherited from ListControl) VisibleChanged

Occurs when the Visible property value changes.