Casting Func<T> to Func<object>

I'm trying to figure out how to pass Func<T> to Func<object> method argument:

public void Foo<T>(Func<T> p) where T: class
{
    Foo(p);
}

public void Foo(Func<object> p)
{

}

Strange thing, it works in NET 4.0 Class library, but doesn't work in Silverlight 4 Class library. Actually I want it to work in Silverlight, and I have inpu开发者_运维百科t parameters like Func<T, bool>

This will do the trick:

public void Foo<T>(Func<T> p) where T : class
{
    Func<object> f = () => p();
    Foo(f);
}

In C# 4.0 targeting .NET 4.0 (i.e. with variance) that is fine "as is", since there is a reference-preserving conversion from T : class to object. This is possible because Func<T> is actually defined as Func<out T>, making it covariant.

In previous versions of C#, or with C# 4.0 targeting earlier versions of .NET, you need to translate as per Steven's answer.

note, you will need disambiguation to prevent it being recursive! At the simplest, two method names. Or alternatively, Foo((Func<object>)p).