LINQ Reverse() Method

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  Keywords : How to reverse a generic list items order using reverse method in linq with example, LINQ reverse list / collection items using reverse() method with example, LINQ reverse list with example

Here we will learn linq reverse() method with example in c#, vb.net and how to use linq reverse() method to reverse list / collection items order with example in c#, vb.net.

LINQ Reverse() Method

In LINQ Reverse method is used to simply reverses the list / collection items order.

Syntax of LINQ Reverse Method

Following is the syntax of using LINQ Reverse method to reverse the list / collection items.

 

C# Code

 

IEnumerable<Student> result = Students.Reverse();

VB.NET Code

 

Dim result As IEnumerable(Of Student) = Students.Reverse()

Let’s have a look at one example to understand more about the reverse operator.

Example of LINQ Reverse() Method

Following is the example of using LINQ Reverse() method to reverse order of list / collection of items.

 

C# Code

 

using System;

using System.Collections.Generic;

using System.Linq;

 

namespace LINQExamples

{

class Program

{

staticvoid Main(string[] args)

{

List<Student> Objstudent = new List<Student>()

{

new Student() { RoleId=1, Name = "Suresh Dasari", Gender = "Male", Subjects = new List<string> { "Mathematics", "Physics" } },

new Student() { RoleId=2, Name = "Rohini Alavala", Gender = "Female", Subjects = new List<string> { "Entomology", "Botany" } },

new Student() { RoleId=3, Name = "Praveen Kumar", Gender = "Male", Subjects = new List<string> { "Computers", "Operating System", "Java" } },

new Student() { RoleId=4, Name = "Sateesh Chandra", Gender = "Male", Subjects = new List<string> { "English", "Social Studies", "Chemistry" } },

new Student() { RoleId=5, Name = "Madhav Sai", Gender = "Male", Subjects = new List<string> { "Accounting", "Charted" } }

};

Console.WriteLine("Iterating Students in the Normal order");

Console.WriteLine("");

IEnumerable<Student> Students = Objstudent;

foreach (var item in Students)

{

Console.WriteLine("StudentId={0} Name={1} Gender={2}", item.RoleId, item.Name, item.Gender);

}

Console.WriteLine("-------------------------------------------------");

Console.WriteLine("Iterating Students in the Reverse order");

Console.WriteLine("");

IEnumerable<Student> result = Students.Reverse();

foreach (var item in result)

{

Console.WriteLine("StudentId={0} Name={1} Gender={2}", item.RoleId, item.Name, item.Gender);

}

Console.ReadLine();

}

}

class Student

{

public int RoleId { get; set; }

public string Name { get; set; }

public string Gender { get; set; }

public List<string> Subjects { get; set; }

}

}

VB.NET Code

 

Module Module1

Sub Main()

Dim Objstudent As New List(Of Student)() From {

New Student() With {.RoleId = 1, .Name = "Suresh Dasari", .Gender = "Male", .Subjects = New List(Of String)() From {"Mathematics", "Physics"}},

New Student() With {.RoleId = 2, .Name = "Rohini Alavala", .Gender = "Female", .Subjects = New List(Of String)() From {"Entomology", "Botany"}},

New Student() With {.RoleId = 3, .Name = "Praveen Kumar", .Gender = "Male", .Subjects = New List(Of String)() From {"Computers", "Operating System", "Java"}},

New Student() With {.RoleId = 4, .Name = "Sateesh Chandra", .Gender = "Male", .Subjects = New List(Of String)() From {"English", "Social Studies", "Chemistry"}},

New Student() With {.RoleId = 5, .Name = "Madhav Sai", .Gender = "Male", .Subjects = New List(Of String)() From {"Accounting", "Charted"}}

}

Console.WriteLine("Iterating Students in the Normal order")

Console.WriteLine("")

Dim Students As IEnumerable(Of Student) = Objstudent

For Each item In Students

Console.WriteLine("StudentId={0} Name={1} Gender={2}", item.RoleId, item.Name, item.Gender)

Next

Console.WriteLine("-------------------------------------------------")

Console.WriteLine("Iterating Students in the Reverse order")

Console.WriteLine("")

Dim result As IEnumerable(Of Student) = Students.Reverse()

For Each item In result

Console.WriteLine("StudentId={0} Name={1} Gender={2}", item.RoleId, item.Name, item.Gender)

Next

Console.ReadLine()

End Sub

Class Student

Public Property RoleId() As Int32

Get

Return m_RoleId

End Get

Set(ByVal value As Int32)

m_RoleId = value

End Set

End Property

Private m_RoleId As Int32

Public Property Name() As String

Get

Return m_Name

End Get

Set(ByVal value As String)

m_Name = value

End Set

End Property

Private m_Name As String

Public Property Gender() As String

Get

Return m_Gender

End Get

Set(ByVal value As String)

m_Gender = value

End Set

End Property

Private m_Gender As String

Public Property Subjects() As List(Of String)

Get

Return m_Subjects

End Get

Set(ByVal value AsList(Of String))

m_Subjects = value

End Set

End Property

Private m_Subjects As List(Of String)

End Class

End Module

If you observe above code we are displaying "Objstudent" list items without reversing and with reversing by using Reverse() method.

Output of LINQ Reverse() Method Example

Following is the result of linq reverse method example to reverse the list / collection items order.

 

Iterating Students in the Normal order

 

StudentId=1 Name=Suresh Dasari Gender=Male

StudentId=2 Name=Rohini Alavala Gender=Female

StudentId=3 Name=Praveen Kumar Gender=Male

StudentId=4 Name=Sateesh Chandra Gender=Male

StudentId=5 Name=Madhav Sai Gender=Male

-------------------------------------------------

Iterating Students in the Reverse order

 

StudentId=5 Name=Madhav Sai Gender=Male

StudentId=4 Name=Sateesh Chandra Gender=Male

StudentId=3 Name=Praveen Kumar Gender=Male

StudentId=2 Name=Rohini Alavala Gender=Female

StudentId=1 Name=Suresh Dasari Gender=Male

This is how we can use LINQ Reverse() method to change / reverse list / collection items order.

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