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How to use Enum in C#

Enums are strongly typed constants . If you have a number of constants that are logically related to each other, then you can group together these constants in an enumeration . The main benefit of this is that constants can be referred to in a consistent, expressive and type safe way.

Syntax

Creating an enumeration type

Enums are strongly typed constants which makes the code more readable and less prone to errors. It is useful when you have a set of values that are functionally significant and unchanged. The main advantage of Enum is make it easy to change values in the future, also you can reduces errors caused by transposing or mistyping numbers.


How to C# Enum

How to retrieve enum values

example

By default the underlying type of each element in the enum is int. If you try with above example to convert to integer then you can see the result:

output

Enum underlying type

C# enum types

By default the underlying type of each element in the enum is int. This means that, an enum declaration that does not explicitly declare an underlying type has an underlying type of int. You can specify another integral numeric type by using a colon . You can explicitly declare an underlying type of byte, sbyte, short, ushort, int, uint, long or ulong.

The following Enum declare as byte, you can verify the underlying numeric values by casting to the underlying type .

You can retrieve the value like the following:

output

Enum values

You can assign any values to the elements in the enumerator list of an enumeration type. By default, the first member of an enum takes the value of zero. If this value doesn't make sense for your enum, you can change it to one or some other number. If you declare a different value in the first member of Enum then it assign the next value greater by one than that of the immediately preceding member .

output

How to cast an Enum directly to int?

How to cast int to enum?

Method 1:

Following is the easiest method to cast an int to enum.

example

Converts int to enum values

Method 2:

example

How to check If a Enum contain a number?

The Enum.IsDefined() method tests if a particular value or name is defined within an enumeration's list of constants.

This method requires two parameters. The first one is the type of the enumeration to be checked. This type is usually obtained using a typeof expression . The second one is defined as a basic object. It is used to specify either the integer value or a string containing the name of the constant to find. The return value is a Boolean that is true if the value exists and false if it does not.

Enum.Parse

Enum.Parse() converts the C# string representation of the name or integer value of one or more enumerated constants to an equivalent Enum object .

Convert a string to an enum

output

How to Loop through all enum values

The Enum.GetValues() method returns an array that contains a value for each member of the enum Type . If more than one members have the same value, it returned array includes duplicate values

Iterating through an enum

The following example will show how do enumerate an enum .

Enum in Switch Case

The following program shows how to use Enum in Switch..Case statement.

Enum Class Methods

Methods Description
Equals(Object) Returns a boolean value indicating whether this instance is equal to a specified object.
GetNames(Type) Retrieves string array of the names of the constants in in enumType.
HasFlag(Enum) Returns true one or more bit fields are set in the current instance.
Parse(Type, String) Converts the string representation of the name or numeric value of one or more enumerated constants to an equivalent enumerated object.
ToString() Returns the string representation of the value of this instance.

C# Enum flags

Enum Flags Attribute

The idea of Enum Flags is to take an enumeration variable and allow it hold multiple values. It should be used whenever the enum represents a collection of flags, rather than representing a single value. More about.... Enum Flags Explained

Convert an enum to a List

The following program shows how to convert an enum to List Datastructure . More about.... Enum to List










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