check that AssociatedObject is set before Execute() is called

tibel · Jun 1, 2014 · 8a35356 · 8a35356
1 parent dd277df
commit 8a35356
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/Caliburn.Xaml.Universal/Behaviors/TriggerAction.cs b/src/Caliburn.Xaml.Universal/Behaviors/TriggerAction.cs
@@ -1,4 +1,5 @@
-using Microsoft.Xaml.Interactivity;
+using System;
+using Microsoft.Xaml.Interactivity;
 using Windows.UI.Xaml;
 
 namespace Caliburn.Light
@@ -57,6 +58,9 @@ protected virtual void OnDetaching() { }
         /// </returns>
         public object Execute(object sender, object parameter)
         {
+            if (AssociatedObject == null)
+                throw new InvalidOperationException("AssociatedObject was not set before Execute.");
+
             Invoke(parameter);
             return null;
         }