Ordering Operators in Linq

There are mainly five types of Ordering Operators in Linq.


1. OrderBy

2. OrderByDescending

3. ThenBy

4. ThenByDescending

5. Reverse



1.OrderBy
public void OrderBy()
{
    string[] names = { "Tom", "Dick", "Harry", "Mary", "Jay" };
 
    var sortedNames = names.OrderBy (s => s);
    var sortedNamesLengthWise = names.OrderBy (s => s.Length);
 
    Console.WriteLine("Sorted List: ");
    foreach (var n in sortedNames)
    {
        Console.WriteLine(n);
    }
    Console.WriteLine("Sorted List LengthWise: ");
    foreach (var nlw in sortedNamesLengthWise)
    {
        Console.WriteLine(nlw);
    }
}

OutPut

Sorted List:
Dick
Harry
Jay
Mary
Tom


2.OrderByDescending
public void OrderByDescending()
{
    string[] names = { "Tom", "Dick", "Harry", "Mary", "Jay" };
 
    var sortedNames = names.OrderByDescending(s => s);
    var sortedNamesLengthWise = names.OrderByDescending(s => s.Length);
 
    Console.WriteLine("Sorted Descending : ");
    foreach (var n in sortedNames)
    {
        Console.WriteLine(n);
    }
    Console.WriteLine("Sorted Descending LengthWise: ");
    foreach (var nlw in sortedNamesLengthWise)
    {
        Console.WriteLine(nlw);
    }
}

OutPut

Sorted List:
Tom
Mary
Jay
Harry
Dick
Sorted List LengthWise:
Harry
Dick
Mary
Tom
Jay

3.ThenBy
public void ThenBy()
{
    string[] names = { "Tom", "Dick", "Harry", "Mary", "Jay" };
 
    var sortedNames = names.OrderBy(s => s.Length).ThenBy (s => s);
    var sortedNamesLengthWise = names.OrderBy (s => s.Length).ThenBy (s => s[1]).ThenBy (s => s[0]);
 
    Console.WriteLine("Sorting By Length then alphabetically : ");
    foreach (var n in sortedNames)
    {
        Console.WriteLine(n);
    }
    Console.WriteLine("By length, then second character, then first character : ");
    foreach (var nlw in sortedNamesLengthWise)
    {
        Console.WriteLine(nlw);
    }
}

OutPut

Sorting By Length then alphabetically :
Jay
Tom
Dick
Mary
Harry

By length, then second character, then first character :

Jay
Tom
Mary
Dick
Harry

4.ThenByDescending

public void ThenByDescending()
{
 string[] names = { "Tom", "Dick", "Harry", "Mary", "Jay" };
var sortedNames = names.OrderBy(s => s.Length).ThenByDescending(s => s);
Console.WriteLine("Sorting By Length then alphabetically in descending order : ");
foreach (var n in sortedNames)
 {
 Console.WriteLine(n);
 }
}
OutPutSorting By Length then alphabetically in descending order :
Tom
Jay
Mary
Dick
Harry

5.Reverse

public void Reverse()
{
 string[] names = { "Tom", "Dick", "Harry", "Mary", "Jay" };
var reverse = names.Reverse();
Console.WriteLine("Reversing the collection : ");
foreach (var r in reverse)
 {
   Console.WriteLine(r);
  }
}
OutPutReversing the collection :
Jay
Mary
Harry
Dick
Tom