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C# List<T>.AddRange() Method with Example

C# List<T>.AddRange() Method: In this tutorial, we will learn about the AddRange() method of List collection with its usage, syntax, and an example using C# program. By IncludeHelp Last updated : April 15, 2023

C# List<T>.AddRange() Method

List<T>.AddRange() method is used to add the objects/elements of a specified collection at the end of the list.

Syntax

void List<T>.AddRange(IEnumerable<T> collection);

Parameter(s)

It accepts a collection of elements (like, arrays) of T type to add in the List.

Return Value

It returns nothing – it's return type is void

Example

int list declaration:
List<int> a = new List<int>();
    
int array to be added to the list:
int[] int_arr = { 100, 200, 300, 400 };

Adding elements:
a.AddRange(int_arr);

Output:
100 200 300 400

C# program to add items to the list using List<T>.AddRange() method

using System;
using System.Text;
using System.Collections.Generic;

namespace Test {
  class Program {
    static void Main(string[] args) {
      //integer list
      List <int> a = new List <int> ();
      //int array to add in the list
      int[] int_arr = {100, 200, 300, 400 };

      //adding elements
      a.Add(10);
      a.Add(20);
      //adding range 
      a.AddRange(int_arr);

      //printing elements
      Console.WriteLine("list elements are...");
      foreach(int item in a) {
        Console.Write(item + " ");
      }
      Console.WriteLine();

      //string list
      List <string> b = new List <string> ();
      //string array to add in the list
      string[] str_arr = {"Abhi", "Radib", "Prem"};
      
      //adding elements
      b.Add("Manju");
      b.Add("Amit");
      //adding range
      b.AddRange(str_arr);

      //printing elements
      Console.WriteLine("list elements are...");
      foreach(string item in b) {
        Console.Write(item + " ");
      }
      Console.WriteLine();

      //hit ENTER to exit
      Console.ReadLine();
    }
  }
}

Output

list elements are...
10 20 100 200 300 400
list elements are...
Manju Amit Abhi Radib Prem

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