Defining bounded generic type parameter in C#

Question

In Java, it is possible to bind the type parameter of a generic type. It can be done like this:

class A<T extends B> {
    ...
}

So, the type parameter for this generic class of A should be B or a subclass of B.

I wonder if C# has a similar feature. I appreciate if somebody let me know.

Thanks

Answer 1

The same in C# is:

class A<T> where T : B
{

}

Also see "Constraints on Type Parameters" (msdn) for a great overview of constraints in general.

Answer 2

Very similar:

public class A<T> where T : B
{
    // ...
}

This can be used to constrain T to be a sub-class or implementation of B (if B is an interface).

In addition, you can constrain T to be reference type, value type, or to require a default constructor:

where T : class     // T must be a reference type
where T : struct    // T must be a value type
where T : new()     // T must have a default constructor