How to cast object to ISingleResult<T> where T is interface C# 3.0

In my program I have a function which returns object. I know that this object is ISingleResult<T> where T is unknown, but it implements an interface IFoo. How do I cast this object to开发者_如何学C ISingleResult<IFoo> using C# 3.0?

Thank you for your help!

Use the ReturnValue property. It is defined in one of the interfaces ISingleResult<T> derives from.