System.Windows.Markup.XamlParseException

I have written a WPF application, on my compuyter it is running ok. Now I am trying to deploy wpf application on W7 computer. And getting following exception:

Any idea what is wrong here ?

6 Answers 6

This type of exception is common when some part of your main window constructor or load operations fail. If you can get your hands on the stack trace, look to the inner exception and you will probably find the real issue.

I had this problem because I was showing a form from in Application constructor. This form was using Style=»«. This static resource was defined in the application’s XAML file.

I solved the problem by showing the form at a later stage in the application, when the Application object was fully constructed.

I had the same exception report. I could solve it by using the windbg program.

• download the windbg x86 (not x64) version.
• open the .exe file of the app in it (File menu -> open exe.)
• run these commands to see the real exception:

After the analysis, I found that the System.Net.Http.Formatting assembly was missing from the system.

the only thing I can think of is whether both boxes have same .NET version on it. NET 4 has some new features (re XAML parser) that 3.5 SP1 doesnt have

I noticed a similar behavior when installing a ClickOnce app on a clean machine. I solved by setting the requirements of the app for install both .Net 4 and .Net 3.5 full.

It was not happened anymore.

Make sure you are build in the correct architecture x86 or x64 when you run on the target machine. I face the same problem as well, the app able to run on my thumbdrive FAT32 however it failed on another machine with Windows 7 — 32bit (I know Windows 7 with 32bit is quite odd though) see http://social.msdn.microsoft.com/Forums/vstudio/en-US/8f803f28-dfda-4be5-9e8d-f7d82db95961/c-wpf-systemwindowsmarkupxamlparseexception?forum=wpf

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System.Windows.Markup.XamlParseException occurred. Microsoft visual studio community 2017

Please can someone be of help. I encountered this exception below, while trying to compile an XAML code.

System.Windows.Markup.XamlParseException occurred HResult=0x80131501 Message=’Provide value on ‘System.Windows.Baml2006.TypeConverterMarkupExtension’ threw an exception.’ Line number ’28’ and line position ’22’. Source=PresentationFramework StackTrace: at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri) at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri) at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream) at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) at XAMLImage.MainWindow.InitializeComponent() in c:\users\mypc\documents\visual studio 2017\Projects\XAMLImage\XAMLImage\MainWindow.xaml:line 1

Inner Exception 1: IOException: Cannot locate resource ‘images/tahoe_01.jpg’.

The exception occurred at «InitializeComponent()» of the c# partial class of the code behind. Below is the c# partial class

Below is the XAML code

There is a blue squiggly line under the Source URL of the Image and ImageSource URL of the ImageBrush elements. I hover my mouse over them, and intellisense says «could not find file ‘c:\Program Files(x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\images%5Cmyfilename.gif'»(one of the files is a gif, and the other is a png). I thought these was an unsual path for the file to be located, but I went on and created the URLs on that path, but expection, still throwing.

Please can someone be of help. Am using Microsoft visual studio community 2017

System.Windows.Markup.XamlParseException’ occurred in PresentationFramework.dll?

I’m using WPF on C# as code bellow

When I run the app, it will throw following exception

Line 9 is xmlns:customControl=»clr-namespace:DVRClientInterface.CustomControls» .

But I don’t know why, before that the XAML still work fine. I just edit the code in the C++ project, and after that it always throw that exception.

Many topics said that it was caused by the projects config, but I don’t know where in my projects config raise this exception.

Someone can suggest me how to fix it?

UPDATE: The output debug as below

7 Answers 7

This is not a problem with XAML. The error message is saying that it tried to create an instance of DVRClientInterface.MainWindow and your constructor threw an exception.

You will need to look at the «Inner Exception» property to determine the underlying cause. It could be quite literally anything, but should provide direction.

An example would be that if you are connecting to a database in the constructor for your window, and for some reason that database is unavailable, the inner exception may be a TimeoutException or a SqlException or any other exception thrown by your database code.

If you are throwing exceptions in static constructors, the exception could be generated from any class referenced by the MainWindow . Class initializers are also run, if any MainWindow fields are calling a method which may throw.

An unhandled exception of type ‘System.Windows.Markup.XamlParseException’ occurred in PresentationFramework.dll

I’m working on a small application in C# / WPF that is fed by data from the serial port. It also reads a text file containing some constants in order to calculate something. An event handler is made to handle the incoming data when it arrives:

Here is the Receive handler, along with a delegate that is created in a Dispatcher, to further update the UI.

The dispatcherTimer allows resending commands to the unit on the serial line, if it fails to get any data in a reasonable amount of time.

In addition to also reading from a text file, the application has some keyboard shortcut gestures defined in the constructor of the main window:

So the MainWindow.xaml has this command binding code:

Visual Studio Designer complains about invalid markup, but still used to run fine, until I started getting these errors when running the program:

An unhandled exception of type ‘System.Windows.Markup.XamlParseException’ occurred in PresentationFramework.dll

Additional information: ‘The invocation of the constructor on type ‘Vaernes.MainWindow’ that matches the specified binding constraints threw an exception.’ Line number ‘4’ and line position ‘9’.

This kind of error appears after making small code changes. The latest was replacing the text file read by the program, with another one with the same name (Add Existing item. ). I have searched around some on the web for solutions but I can’t find any that is quite similar to my problem.