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C# - Enum.IsDefined() Method with Example

In this tutorial, we will learn about the C# Enum.IsDefined() method with its definition, usage, syntax, and example. By Nidhi Last updated : March 29, 2023

C# Enum.IsDefined() Method

The Enum.IsDefined() method is used to check given specified value is defined in enum or not. It returns a boolean value, it returns true if the given value is defined otherwise it returns false.

Syntax

    bool Enum.IsDefined(Type enumType,object value);

Parameter(s)

• enumType : Type of enum.
• value : Value that is defined in enum or not.

Return Value

This method returns a boolean value if the given specified value is defined in enum or not. Otherwise, it returns false.

Exception(s)

• System.ArgumentException
• System.ArgumentNullException
• System.InvalidOperationException

C# Example of Enum.IsDefined() Method

The source code to demonstrate the IsDefined() method of Enum class is given below. The given program is compiled and executed successfully.

using System;

class Sample {
  enum Directions {
    EAST = 0, WEST = 1, NORTH = 2, SOUTH = 3
  };

  //Entry point of Program
  static public void Main() {
    bool isDefined = false;

    isDefined = Directions.IsDefined(typeof (Directions), 1);
    if (isDefined == true)
      Console.WriteLine("It is defined");
    else
      Console.WriteLine("It is not defined");

    isDefined = Directions.IsDefined(typeof (Directions), 8);
    if (isDefined == true)
      Console.WriteLine("It is defined");
    else
      Console.WriteLine("It is not defined");
  }
}

Output

It is defined
It is not defined
Press any key to continue . . .

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