WPF Trigger not null

Question

How to trigger an action in WPF when the Property is not null? This is a working solution when is null:

Answer 1

You can use DataTrigger class in Microsoft.Expression.Interactions.dll that come with Expression Blend.

Code Sample:

Using this method you can trigger against GreaterThan and LessThan too. In order to use this code you should reference two dll's:

System.Windows.Interactivity.dll
Microsoft.Expression.Interactions.dll

And add the corresponding namespaces:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"  
xmlns:ie="http://schemas.microsoft.com/expression/2010/interactions"