Linq Prepend Method In C#

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Linq Prepend Method in C#:

The Linq Prepend Method is used to add one value to the beginning of a sequence. This Prepend method like the Append method does not modify the elements of the sequence. Instead, it creates a copy of the sequence with the new element. The signature of this is given below.

Type Parameters

TSource: The data type of the elements contained in the sequence.

Parameters:

IEnumerable<TSource> source: A sequence of values.
TSource element: The value to prepend at the beginning of the sequence.

Returns:

IEnumerable<TSource>: A new sequence that begins with the element.

Exceptions: When the source is null, it will throw ArgumentNullException.

Note: This method is supported from Framework 4.7.1 or later.

Exmple:

The following example shows how to prepend a value to the beginning of the sequence using the Prepend method. The following example code is self-explained. So, please go through the comment lines.


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

namespace LinqDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            // Creating a list of numbers
            List<int> numberSequence = new List<int> { 10, 20, 30, 40 };

            // Trying to prepend 50
            numberSequence.Prepend(50);

            // It will not work because the original sequence has not been changed
            Console.WriteLine(string.Join(", ", numberSequence));

            // It works now because we are using a changed copy of the original list
            Console.WriteLine(string.Join(", ", numberSequence.Prepend(50)));

            // If you prefer, you can create a new list explicitly
            List<int> newNumberSequence = numberSequence.Prepend(50).ToList();

            // And then write to the console output
            Console.WriteLine(string.Join(", ", newNumberSequence));

            Console.ReadKey();
        }
    }
}

using System.Linq;

using System.Collections.Generic;

using System;

namespace LinqDemo

{

class Program

{

static void Main(string[] args)

{

// Creating a list of numbers

List<int> numberSequence = new List<int> { 10, 20, 30, 40 };

// Trying to prepend 50

numberSequence.Prepend(50);

// It will not work because the original sequence has not been changed

Console.WriteLine(string.Join(", ", numberSequence));

// It works now because we are using a changed copy of the original list

Console.WriteLine(string.Join(", ", numberSequence.Prepend(50)));

// If you prefer, you can create a new list explicitly

List<int> newNumberSequence = numberSequence.Prepend(50).ToList();

// And then write to the console output

Console.WriteLine(string.Join(", ", newNumberSequence));

Console.ReadKey();

}

In the next article, I am going to discuss the LINQ ZIP Method with an example. Here, in this article, I try to explain the Linq Prepend Method in C# with an example.

Linq Prepend Method in C#

Linq Prepend Method in C#:

Type Parameters

Exmple:

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