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is operator »
 

as operator

as operator does the down cast. Rather than throws exception out it assigns the reference to null.


using System;
class Person
{
    public string name;
}
class Employee : Person
{
    public string companyName;
}

class Program
{
    static void Main(string[] args)
    {
        Person p = new Person();

        Employee e = p as Employee;
       
    }
}

After the as operator we can use if statement to check the result.


using System;
class Person
{
    public string name;
}
class Employee : Person
{
    public string companyName;
}

class Program
{
    static void Main(string[] args)
    {
        Person p = new Person();

        Employee e = p as Employee;

        if (e == null)
        {
            Console.WriteLine("successful");

        }
    }
}

The output:


successful
« as is
is operator »
 
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