XAML error – System.Windows.Baml2006.TypeConverterMarkupExtension

Notice, if you will, this itty bitty block of code:

<ListBox Name="FilesList" ItemsSource="{Binding FileList}" Width="100%">
   <TextBlock Text="{Binding}" />

While attempting to databind a custom collection class to a ListBox, I encountered an oddly named exception:

XamlParseException occurred
Provide value on 'System.Windows.Baml2006.TypeConverterMarkupExtension' threw an exception.

What the heck is Baml2006?

Anyway, here is the offending line:

<ListBox Name="FilesList" ItemsSource="{Binding FileList}" Width="100%">

Guess which part is the problem? The ‘Width=”100%”‘ part. When I changed it to read ‘Width=”350″‘, the error went away. No worries, but a more helpful error message would have been nice.

I’ve also received the “BAML” error where there are other invalid characters in a property value. So don’t put those invalid characters in property fields, kids – that’s bad.

  1. #1 by Vonziz on March 7, 2011 - 2:20 pm


    Width of your listbox can’t be in % in xaml langage, that’s why you’ve got this error.


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