Is Operator in C#
The Is operator in C# is used
to check if a type of an object is compatible with the other type. If type is
not compatible, you will also see C# compiler will through an error in Visual
Studio IDE.
Visual Studio 2010 IDE
is smart enough to warn you when you try to use Is operator on types that are
not compatible. If types are now compatible, you will see an warning message
like following:
![IsOpImg.jpg]()
The following syntax
uses Is operator to check if item is a string type or not and return true if it
is; otherwise returns false.
If (item
is string)
The following syntax
uses Is operator to check if a Car type is a Vehicle type or not and displays
an appropriate message on the console.
using
System;
using System.Collections.Generic;
using
System.Linq;
using
System.Text;
namespace
IsOperatorSample
{
public class Animal
{
}
public class Vehicle
{
}
public class Car : Vehicle
{
}
class Program
{
static void Main(string[]
args)
{
Vehicle
v = new Vehicle();
Animal
a = new Animal();
Car
c = new Car();
if (c is
Vehicle)
{
Vehicle
newV = (Vehicle)c;
Console.WriteLine(c.ToString()
+ " is a Vehicle. ");
}
else
{
Console.WriteLine(c.ToString()
+ " is NOT a Vehicle. ");
}
if (c is Animal)
{
Console.WriteLine(c.ToString()
+ " is an Animal. ");
}
else
{
Console.WriteLine(c.ToString()
+ " is NOT an Animal. ");
}
Console.ReadLine();
}
}
}
The output looks like
following where you can see Car is a Vehicle while Car is not an Animal.
![IsOpImg2.jpg]()