A simple demonstration of a base class constraint. : Base class constaint « Generic « C# / CSharp Tutorial

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C# / CSharp Tutorial » Generic » Base class constaint   18. 19. 1. A simple demonstration of a base class constraint. Because of the base class constraint, all type arguments passed to Test must have A as a base class. using System;    class A {    public void hello() {      Console.WriteLine("Hello");    }  }    class B : A { }    class C { }    class Test<T> where T : A {    T obj;      public Test(T o) {      obj = o;    }      public void sayHello() {      obj.hello();    }  }    class MainClass {    public static void Main() {      A a = new A();      B b = new B();      C c = new C();        Test<A> t1 = new Test<A>(a);        t1.sayHello();        Test<B> t2 = new Test<B>(b);        t2.sayHello();          // The following is invalid because      // C does not inherit A.  //    Test<C> t3 = new Test<C>(c); // Error!    }  } Hello Hello 18. 19. Base class constaint 18. 19. 1.  A simple demonstration of a base class constraint. 18. 19. 2.  A more practical demonstration of a base class constraint

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