WPF Binding : Casting in binding path

Question

I've a binding where the Path is set to Path=Item.Tag.caption, but I need to cast Item to IEDGE first so I can access the Tag Property. Is there a way to achieve this?

@Aminouvic If Item is implementing IEDGE and Tag is a property, it should work like you've posted it. What error are you getting? — DHN
– DHN, Commented May 15, 2013 at 9:34
@DHN the problem is that during binding Item is of type object, then I am getting an error that Tag property not found for object — Aminouvic
– Aminouvic, Commented May 15, 2013 at 9:40

Bijington · Accepted Answer · 2019-11-21 12:52:05Z

90

The solution for the problem, finally, is to use following syntax:

Path=Item.(myNameSpace:IEdge.Tag).caption

The previous code cast Item to the type IEdge in order to access the Tag property.

In case of multiple nested casts the global pattern is :

Path=Obj1.(ns1:TypeObj1.Obj2).(ns2:TypeObj2.Obj3)...(nsN:TypeObjN.BindedProp)

As suggested in comments Do not use shorthand binding syntax when using this solution. Ensure you actually use Path= otherwise it won't work!

edited Nov 21, 2019 at 12:52

Bijington

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answered May 15, 2013 at 10:42

Aminouvic

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12 Comments

Libor Over a year ago

Okay, I made it work but still - where you found this information? It seems like some WPF under-the-hood undocumented black magic...

Aminouvic Over a year ago

@Libor : Actually I found the solution on msdn PropertyPath XAML Syntax using Property partial qualification see section Single Property, Attached or Otherwise Type-Qualified

zastrowm Over a year ago

web.archive.org/web/20120814100526/http://msdn.microsoft.com/… for those of us in 2015 where the link that @Aminouvic posted no longer exists.

Andrew Stakhov Over a year ago

Do not use shorthand binding syntax when using this solution. Ensure you actually use Path= otherwise it won't work.

M.kazem Akhgary Over a year ago

what if I just want to cast. and not access property like just Item.(myNameSpace:IEdge)? this fails it wants me to access property of IEdge but I just wanted to cast Item to IEdge?

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