C# Is

2075 / C# / Класи / Is

class A
{
  public virtual void F1() {
    Console.WriteLine("A");
  }
}

class B : A
{
  public override void F1() {
    Console.WriteLine("B");
  }
}

class C
{
}

static void Main(string[] args)
{
  A obj = new B();
  if (obj is A)
  {
    Console.WriteLine("obj is A");
  }

  if (obj is B)
  {
    Console.WriteLine("obj is B");
  }

  if (obj is C)
  {
    Console.WriteLine("obj is C");
  }
  else 
  {
    Console.WriteLine("obj is not C");
  }

  Console.ReadKey();
}