Convert Enum to Integer or Integer to Enum examples | C# Examples

This tutorial explains about following things in C#

• How to convert Int to Enum constants
• How to parse Enum to Int in C Sharp? Enum is a custom special class type to have a group of constant values. the values can be strings or numbers.

Int is a native predefined type in C# that stores numeric values.

Automatic conversion is not possible due to different types of data.

Let’s declare Enum constants in C#, Enum constants contain an int value.

public enum DAYS : int{
    Monday = 1,
    Tuesday = 2,
    Wednesday = 3,
    Thursday = 4,
    Friday = 5,
    Saturday = 6,
    Sunday = 7,
}

Enum in C# supports constants mapped with Integer, Short, Bytes, and String.

Above example, Enum constants map with an integer.

How to Convert Int to Enum in C#?

Sometimes, Integers values need to convert to Enum Constants.

Simply, cast an integer to a given type, returns Enum.

Enum enum = (Enum) integer ;

Here is an example for parse Int to Enum in C#.

using System;

public class Program
{
    public static void Main()
    {
    var day= (DAYS)2;
    Console.WriteLine("Day is : {0}", day);

    }
}

public enum DAYS : int
{
    Monday = 1,
    Tuesday = 2,
    Wednesday = 3,
    Thursday = 4,
    Friday = 5,
    Saturday = 6,
    Sunday = 7,
}

Output:

The day is : Tuesday

How to Parse Enum to Integer in F#?

It is easy to convert Enum to an integer using cast. Enum constant cast to int type as given below

    int value = (int) Enum.constant;

Here is an example

using System;

public class Program
{
    public static void Main()
    {
    int number = (int) DAYS.Friday;
    Console.WriteLine("Day number is : {0}", number);

    }
}

public enum DAYS : int
{
    Monday = 1,
    Tuesday = 2,
    Wednesday = 3,
    Thursday = 4,
    Friday = 5,
    Saturday = 6,
    Sunday = 7,
}

Compiled to output:

The day number is 5

Another way

• using Convert.ToInt32 function

    DAYS day= DAYS.Friday;
    int number = Convert.ToInt32(day);

• cast enum to an object, recast to an int type

    DAYS day= DAYS.Friday;
    int number = (int)(object)day;