Question

Having such class can I instatiate it in place?

abstract class Mammal {
    public abstract void Foo();
}

I expect that something like that should work:

Mammal wolf = new Mammal() {
    public void Foo() { Console.WriteLine("Wooo"); }
}

However compilier doesn’t allow that.

Answer 1

It looks like you’re after something akin to an anonymous inner class in Java. There’s no equivalent in C#. Options:

• Create a nested class instead.
• Create an implementation which uses delegates for each of the abstract methods, and then use anonymous functions to create those implementations “inline”
• If the type consists of just a single abstract method, consider using a delegate instead of the abstract class to start with.