LINQ Operators:Partition Operators

This post is the part of series called LINQ Operators that brings the practical examples of LINQ operators. In previous posts we have learned about Filtering and Projection operators.Today we will see the Partition Operators in LINQ.

 

Partitioning Operators:

 

The Skip, Take, TtakeWhile and SkipWhile are the primary LINQ Partitioning Operators. These operators are commonly used to produced paged result-sets for UI data binding. In order to get the third page of results for a UI that shows 10 records per page, you could apply a Skip(20) operator followed by a Take(10).

Examples:

int[] numbers = { 1, 3, 9, 8, 6, 7, 2, 0, 5, 10 };

var firstFive = numbers.Take(5);

Console.WriteLine("First five numbers:");

foreach (var x in firstFive)

      Console.Write(x + ", ");    /*    Output:    1, 3, 9, 8, 6    */

var skipFive = numbers.Skip(5);

Console.WriteLine("All but first five numbers:");

foreach (var x in skipFive)

      Console.Write(x + ", ");    /*    Output:    7, 2, 0, 5, 10    */

var firstLessThanFive = numbers.TakeWhile(n => n < 5);

Console.WriteLine("First numbers less than five:");

foreach (var x in firstLessThanFive)

      Console.Write(x + ", ");    /*    Output:    1, 3    */

var fromFirstEven = numbers.SkipWhile(n => n % 2 != 0);

Console.WriteLine("All elements starting from first even element:");

foreach (var x in fromFirstEven)

      Console.Write(x + ", ");    /*    Output:    8, 6, 7, 2, 0, 5, 10    */

Happy reading!!