cast anonymous type to an interface?

Question

This doesn't seem to be possible? So what is the best work-around? Expando / dynamic?

public interface ICoOrd {     int x { get; set; }     int y { get; set; } }       

...

ICoOrd a = new {x = 44, y = 55}; 

ref:

• http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.internalsvisibletoattribute.internalsvisibletoattribute.aspx (Jon's suggestion)

Answer 1

The best "workaround" is to create and use a normal, "named" type that implements the interface.

But if you insist that an anonymous type be used, consider using a dynamic interface proxy framework like ImpromptuInterface.

 var myInterface =  new { x = 44, y = 55 }.ActLike<ICoOrd>(); 

Answer 2

No, anonymous types never implement interfaces. dynamic wouldn't let you cast to the interface either, but would let you just access the two properties. Note that anonymous types are internal, so if you want to use them across assemblies using dynamic, you'll need to use InternalsVisibleTo.