How to Set TargetNullValue to Visibility.Collapsed in Binding

问题

I'm binding TextBlock.Visiblitiy to something, and I want to set the Binding.TargetNullValue to Collapsed, how can I do it in XAML?

This one How do I set TargetNullValue to a date? does not work in Silverlight. (No x:Static).

回答1:

This is working for me in SL4:

<TextBlock Text="Text" Visibility="{Binding Foo, TargetNullValue=Collapsed}"/>

Where Foo:

public Visibility? Foo { get; set; }

来源：https://stackoverflow.com/questions/8692862/how-to-set-targetnullvalue-to-visibility-collapsed-in-binding