WPF: Is there a way to bind to a Nullable<Int32> property without using a value converter?

Question

Is there a way to bind to a Nullable property without using a value converter?

Currently I have this...

<DataGridTextColumn Header="ApplicationKey" Binding="{Binding ApplicationKey, ValidatesOnDataErrors=True, Converter={StaticResource ResourceKey=TestConverter}}" />

Without the converter it thinks of an empty textbox as a String.Empty instead of a Null.

I'm hoping there is some sort of magic property like TargetNullValue.

Answer 1

Yes, the TargetNullValue property on Binding should do exactly what you want. If you set TargetNullValue to the empty string, then the binding will convert the empty string to null and back:

<DataGridTextColumn Header="ApplicationKey" Binding=
    "{Binding ApplicationKey, ValidatesOnDataErrors=True, TargetNullValue=''}" />