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what is partial operator in LINQ?

Ethan Karla 305 24-Sep-2021

how to use LINQ Partition Operators (Take, Skip, TakeWhile, SkipWhile) in C#?

linq c#  ado.net  linq 
Updated on 24-Sep-2021
Ethan Karla

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Ravi Vishwakarma

Ravi Vishwakarma

27-Sep-2021

Partial operators are used to partial list/ collection into two parts and after using the partial list operator then return the one list value.

There are the following Partial Operators.

  1. TAKE                    - Take( value )
  2. TAKEWHILE        - TakeWhile( Condition )
  3. SKIP                     - Skip( value )
  4. SKIPWHILE         - SkipWhile( Condition )

TAKE Operator

This operator is used to return a specific number of elements.

TAKEWHILE Operator

This operator is used to return a specific number of elements at specific conditions.

SKIP

This operator is used to skip a specific number of elements and return the remaining elements.

SKIPWHILE

This operator is used to skip a specific number of elements at a specific condition and return the remaining elements.

Example

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
 public static void Main()
 {
  List<Student> students = new List<Student>()
  {
  new Student() { StudentId = 1, Name = 'Ashu', Marks = 500 },
  new Student() { StudentId = 2, Name = 'Shyam', Marks = 300 },
  new Student() { StudentId = 3, Name = 'Shriyam', Marks = 400 },
  new Student() { StudentId = 4, Name = 'Sunny', Marks = 550 },
  new Student() { StudentId = 5, Name = 'Ram', Marks = 600 },
  new Student() { StudentId = 6, Name = 'Krishna', Marks = 700 },
  new Student() { StudentId = 7, Name = 'Anupam', Marks = 550 }
  };

  var result = students.Take(3);
  Console.WriteLine('\nTake() :\n');
  Console.WriteLine('{0,-10} {1,10} {2,5}','Name', 'ID', 'Marks');
  result.ToList().ForEach(item => Console.WriteLine('{0,-10} {1,10} {2,5}', item.Name, item.StudentId, item.Marks) );

  var result1 = students.Where( student => student.StudentId < 10).TakeWhile(s => s.Name.StartsWith('A'));
  Console.WriteLine('\nTakeWhile() :\n');
  Console.WriteLine('{0,-10} {1,10} {2,5}','Name', 'ID', 'Marks');
  result1.ToList().ForEach(item => Console.WriteLine('{0,-10} {1,10} {2,5}', item.Name, item.StudentId, item.Marks) );

  var result2 = students.Skip(3);
  Console.WriteLine('\nSkip() :\n');
  Console.WriteLine('{0,-10} {1,10} {2,5}','Name', 'ID', 'Marks');
  result2.ToList().ForEach(item => Console.WriteLine('{0,-10} {1,10} {2,5}', item.Name, item.StudentId, item.Marks) );

  var result3 = students.SkipWhile( s=> s.StudentId < 5);
  Console.WriteLine('\nSkip() :\n');
  Console.WriteLine('{0,-10} {1,10} {2,5}','Name', 'ID', 'Marks');
  result3.ToList().ForEach(item => Console.WriteLine('{0,-10} {1,10} {2,5}', item.Name, item.StudentId, item.Marks) );

  Console.ReadLine();
 }
}

class Student
{
public int StudentId { get; set; }
public string Name { get; set; }
public int Marks { get; set; }
}

Output

Take() :

Name               ID Marks
Ashu                1   500
Shyam               2   300
Shriyam             3   400

TakeWhile() :

Name               ID Marks
Ashu                1   500

Skip() :

Name               ID Marks
Sunny               4   550
Ram                 5   600
Krishna             6   700
Anupam              7   550

Skip() :

Name               ID Marks
Ram                 5   600
Krishna             6   700
Anupam              7   550

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