Tuesday, December 25, 2012

Attached Behaviors vs Attached Properties vs Blend Behaviors

I think the distinction in my mind is this: "normal" attached properties are there as metadata for some other piece of code (i.e. a container control like a Grid or a ToolTip) to modify its own behavior based on the presence of that attached property. When used like that, attached properties are like attributes in C# or VB code - they don't do any work themselves, they are just there to influence behavior implemented somewhere else. When an attached property has a change handler that acts on the exposed API of the DependencyObject to which it is attached, it is an attached behavior - in which case it is much more like an extension method in C# - a chunk of code that can be associated with that object to supplement that object's behavior or functionality without that object's knowledge. 

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