Tag Archives: DataBinding

FormatException in WPF DataBinding

While working on some F#/C# WPF code the other day, I kept hitting a fatal FormatException when running under the debugger. Annoyingly, the app would quit with:

An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll
Additional information: Input string was not in a correct format.

But it worked fine when started from Expression Blend, or when run using Start Without Debugging in Visual Studio. Let’s take a closer look…
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