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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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