as operator in class hearchy : as « Operator « C# / CSharp Tutorial

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C# / CSharp Tutorial » Operator » as 
3.13.4.as operator in class hearchy
using System; 
 
class A {} 
class B : A {} 
 
class MainClass { 
  public static void Main() { 
    A a = new A(); 
    B b = new B(); 
 
    b = a as B; // cast, if possible 
 
    if(b==null)  
      Console.WriteLine("Cast b = (B) a is NOT allowed."); 
    else 
      Console.WriteLine("Cast b = (B) a is allowed"); 
  } 
}
 
Cast b = (B) a is NOT allowed.
3.13.as
3.13.1.Using as
3.13.2.The As Operator for custom class type
3.13.3.Use the 'as' operator to perform a safe cast
3.13.4.as operator in class hearchy
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