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Michael Haddad
Michael Haddad

Reputation: 4455

How to sort a list of enums by the enum indexes in C#?

I have an enum:

public enum Group
{
    Administration = 1,
    Lawyers,
    PropertyManagement
    Bookkeeping,
    Secretariat
}

I have a List of Group also: List<Group>. I need a simple way to sort the values of the list by the enum index.

So, for example, this list:

{ Group.Bookkeeping, Group.Administration, Group.Secretariat, Group.Administration }

Will become:

{ Group.Administration, Group.Administration, Group.Bookkeeping, Group.Secretariat }

(Administration first, bookkeeping second, secretariat last, like in the definition of the enum). I am looking for a simple way (maybe using linq), without manually looping or so.

Upvotes: 0

Views: 579

Answers (3)

TheLethalCoder
TheLethalCoder

Reputation: 6744

You can use Linqs OrderBy:

List<Group> orderedGroups = groups.OrderBy(g => g).ToList();

Upvotes: 0

CodeCaster
CodeCaster

Reputation: 151730

An enum is basically an integral type, and its members gets numbered starting from 0 and incrementing by 1 by default. Given you've supplied a starting index, namely Administration = 1, your enum is numbered as follows:

Administration = 1
Lawyers = 2
PropertyManagement = 3
Bookkeeping = 4
Secretariat = 5

So you can simply sort using the default sort for the collection, as explained in Sorting a List<int>.

Upvotes: 0

Zein Makki
Zein Makki

Reputation: 30062

Array.Sort() uses the underlying type by default to compare the elements:

List<Group> groups = new List<Group>()
{
    Group.Bookkeeping, Group.Administration, Group.Secretariat, Group.Administration
};

groups.Sort();

Upvotes: 4

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