Why does WPF databinding swallow exceptions?

Question

I recently wasted a lot of time trying to debug a WPF datagrid (from the WPF Toolkit). I had a column bound to a linq query with a property that was throwing an exception (i

Answer 1

In case you would like to setup a validation for it, you can add ExceptionValidationRule

http://msdn.microsoft.com/en-us/library/system.windows.controls.exceptionvalidationrule.aspx

Answer 2

Enabling First Chance Exceptions in the debugger (Debug -> Exceptions) will help with this as well, though it can get annoying

Answer 3

I implemented a solution very similar to the one proposed by Karsten:

1. Derived a TraceListener that throws instead of logging
2. Added that listener to PresentationTraceSources.DataBindingSource

Please see the complete solution on GitHub, it includes a demo application and a unit test project.

Answer 4

Here is my favorite. It works without changing the app.config

Answer 5

Databinding errors are swallowed natively, but they are displayed in the OUTPUT dialog in the visual studio interface. If you wish to be notified (and have as much control over it as possible), then you can use Trace Sources.

Bea Stollnitz provides a great writeup about this (and debuginng the bindings in general) here: http://www.beacosta.com/blog/?p=52

Apparently, this blog has departed, but we do have the WayBack Machine: http://web.archive.org/web/20091103200557/http://www.beacosta.com/blog/?p=52

I also added it to my Coding notebook for Evernote: https://www.evernote.com/pub/view/sswrighton/coding/f9786746-94c3-41b5-bcd2-c12992d331a6?locale=en#st=p&n=f9786746-94c3-41b5-bcd2-c12992d331a6