C# | Adding the elements of the specified collection to the end of the List
Last Updated :
01 Feb, 2019
List<T>.AddRange(IEnumerable<T>) Method is used to add the elements of the specified collection to the end of the List<T>.
Properties of List:
- It is different from the arrays. A list can be resized dynamically but arrays cannot.
- List class can accept null as a valid value for reference types and it also allows duplicate elements.
- If the Count becomes equals to Capacity, then the capacity of the List increases automatically by reallocating the internal array. The existing elements will be copied to the new array before the addition of the new element.
Syntax:
public void AddRange (System.Collections.Generic.IEnumerable<T> collection);
Parameter:
collection: It is the specified collection whose elements will be added to the end of the List<T>.
Exception: This method will give ArgumentNullException if the collection is null.
Note: The collection itself cannot be null, but it can contain elements that are null if type T is a reference type. The order of the elements in the collection is always preserved in the List<T>.
Below programs illustrate the use of above discussed method:
Example 1:
using System;
using System.Collections.Generic;
class Geeks {
public static void Main(String[] args)
{
List<String> firstlist = new List<String>();
firstlist.Add( "Geeks" );
firstlist.Add( "GFG" );
firstlist.Add( "C#" );
firstlist.Add( "Tutorials" );
Console.WriteLine( "Before AddRange Method" );
Console.WriteLine();
foreach (String str in firstlist)
{
Console.WriteLine(str);
}
Console.WriteLine( "\nAfter AddRange Method\n" );
firstlist.AddRange(firstlist);
foreach (String str in firstlist)
{
Console.WriteLine(str);
}
}
}
|
Output:
Before AddRange Method
Geeks
GFG
C#
Tutorials
After AddRange Method
Geeks
GFG
C#
Tutorials
Geeks
GFG
C#
Tutorials
Example 2:
using System;
using System.Collections.Generic;
class Geeks {
public static void Main(String[] args)
{
List<String> firstlist = new List<String>();
firstlist.Add( "Geeks" );
firstlist.Add( "GFG" );
firstlist.Add( "C#" );
firstlist.Add( "Tutorials" );
Console.WriteLine( "Before AddRange Method" );
Console.WriteLine();
foreach (String str in firstlist)
{
Console.WriteLine(str);
}
Console.WriteLine( "\nAfter AddRange Method\n" );
string [] str_add = { "Collections" ,
"Generic" ,
"List" };
firstlist.AddRange(str_add);
foreach (String str in firstlist)
{
Console.WriteLine(str);
}
}
}
|
Output:
Before AddRange Method
Geeks
GFG
C#
Tutorials
After AddRange Method
Geeks
GFG
C#
Tutorials
Collections
Generic
List
Reference:
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