Can we Debug Xaml in WPF?

I don't agree with others that it's not possible to debug XAML, but it's true that there are no powerful tools available for this.

As Mark says in this post - http://markegilbert.wordpress.com/2008/03/15/debugging-xaml/

So, the simple answer is yes, you can debug problems with XAML. The longer, more qualified answer is that while it’s possible, the support isn’t terribly robust yet but should improve with newer dev environments (Visual Studio, Expression Blend, etc.).

Tips on how to debug and learn about WPF(Josh Smith): http://joshsmithonwpf.wordpress.com/2007/03/29/tips-on-how-to-debug-and-learn-about-wpf/

Wayback Link | Get line numbers of XAML issues (Peter Himschoot):

Simply add this to your project file:

<!-- under the <PropertyGroup> tag -->
<XamlDebuggingInformation>true</XamlDebuggingInformation>

Now we at least get line number information on the problem :)

More descriptive XAML exception details (Rob Relyea)

More on XamlParseException (Laurent Bugnion)

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Wayback Link | XAML Runtime Parsing Exceptions (c/o Erno de Weerd)

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Wayback Link | How to debug triggers using Trigger-Tracing(Dan Lamping)

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Debugging Dynamic XAML in Silverlight (Julia Lerman)

Just use google/StackOverflow to know how to debug specific XAML issues.

I've occassionally found these tricks here useful...

http://www.wpftutorial.net/DebugDataBinding.html

...particularly the second one where you use a dummy value converter to break in to the debugger. It's useful for seeing exactly what objects are being bound, etc.