possible duplicate:
Cannot serialize parameter of type ‘System.Linq.Enumerable… ’ when using WCF, LINQ, JSON

Hi,

If my method signiature looks like this, it works fine.

[WebGet]
MyClass[] WebMethod()

If the signiature looks like this

[WebGet]
IEnumerable<T> WebMethod()

I get the following error: Cannot serialize parameter of type 'X.Y.Z.T+<WebMethod>d__2c' (for operation 'WebMethod', contract 'IService') because it is not the exact type 'System.Collections.Generic.IEnumerable`1[X.Y.Z.T]' in the method signature and is not in the known types collection. In order to serialize the parameter, add the type to the known types collection for the operation using ServiceKnownTypeAttribute.

I have tried adding. ServiceKnownType(typeof(IEnumerable))

Same error.

Is this a bug in 2010 beta 2, or is this likely to be correct going forward?

Thanks