How can I use interface as a C# generic type constraint?

Question

Is there a way to get the following function declaration?

public bool Foo() where T : interface;

ie. where T is an interface type

Answer 1

No, actually, if you are thinking class and struct mean classes and structs, you're wrong. class means any reference type (e.g. includes interfaces too) and struct means any value type (e.g. struct, enum).