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IS vs AS Operators in C#
IS operator
The "is" operator in C# checks whether the run-time type of an object is compatible with a given type or not.
The following is the syntax −
expr is type
Here, expr is the expression
type is the name of the type
The following is an example showing the usage of is operator in C# &minis;
Example
using System;
class One { }
class Two { }
public class Demo {
public static void Test(object obj) {
One x;
Two y;
if (obj is One) {
Console.WriteLine("Class One");
x = (One)obj;
} else if (obj is Two) {
Console.WriteLine("Class Two");
y = (Two)obj;
} else {
Console.WriteLine("None of the classes!");
}
}
public static void Main() {
One o1 = new One();
Two t1 = new Two();
Test(o1);
Test(t1);
Test("str");
Console.ReadKey();
}
}Output
Class One Class Two None of the classes!
AS Operator
The "as" operator perform conversions between compatible types. It is like a cast operation and it performs only reference conversions, nullable conversions, and boxing conversions. The as operator can't perform other conversions, such as user-defined conversions, which should instead be performed by using cast expressions.
The following is an example showing the usage of as operation in C#. Here as is used for conversion −
string s = obj[i] as string;
Try to run the following code to work with ‘as’ operator in C# −
Example
using System;
public class Demo {
public static void Main() {
object[] obj = new object[2];
obj[0] = "jack";
obj[1] = 32;
for (int i = 0; i < obj.Length; ++i) {
string s = obj[i] as string;
Console.Write("{0}: ", i);
if (s != null)
Console.WriteLine("'" + s + "'");
else
Console.WriteLine("This is not a string!");
}
Console.ReadKey();
}
}Output
0: 'jack' 1: This is not a string!
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