C# | ArrayList.InsertRange() Method (original) (raw)

Last Updated : 06 Jun, 2019

ArrayList.InsertRange(Int32, ICollection) Method in C# is used to insert the elements from a collection into the ArrayList at a specified index. That is the inserted element belongs to a collection(i.e. queue etc).Syntax:

public virtual void InsertRange (int index, ICollection element);

Parameters:

• index: It is the index, where the new elements to be inserted.
• element: It is the ICollection whose elements are going to be inserted into the ArrayList at a specified index.

Note: The collection cannot be null, but it can contain elements that are null. Exceptions:

• ArgumentNullException: If the element is null.
• ArgumentOutOfRangeException: If the index is less than zero or index is greater than counter.
• NotSupportedException: If the ArrayList is read-only or the ArrayList has a fixed size.

Example 1:

csharp `

// C# program to demonstrate the // ArrayList.InsertRange(Int32, // ICollection) Method using System; using System.Collections;

class GFG {

// Main Method
public static void Main()
{
    // initializes a new ArrayList
    ArrayList ArrList = new ArrayList();

    // adding values in the 
    // ArrayList using "Add"
    ArrList.Add("A");
    ArrList.Add("D");
    ArrList.Add("E");
    ArrList.Add("F");

    // initializes a new Stack
    // as collection
    Stack s = new Stack();

    // pushing values in the stack
    // values are pop as B, C
    s.Push("C");
    s.Push("B");

    // Displays the ArrayList and the Queue
    Console.WriteLine("The ArrayList initially has:");
    Display(ArrList);
    Console.WriteLine("The collection initially has:");
    Display(s);

    // Copies the elements of the stack 
    // to the ArrayList at index 1.
    ArrList.InsertRange(1, s);

    // Displays the ArrayList.
    Console.WriteLine("After insert the collection in the ArrList:");
    Display(ArrList);
}

// Display function
public static void Display(IEnumerable ArrList)
{
    foreach(Object a in ArrList)
    {
        Console.Write("   " + a);
    }
    Console.WriteLine();
}

}

`

Output:

The ArrayList initially has: A D E F The collection initially has: B C After insert the collection in the ArrList: A B C D E F

Example 2:+

csharp `

// C# program to demonstrate the // ArrayList.InsertRange(Int32, // ICollection) Method using System; using System.Collections;

class GFG {

// Main Method
public static void Main()
{
    // initializes a new ArrayList
    ArrayList ArrList = new ArrayList();

    // adding values in the ArrayList
    // using "Insert" method
    ArrList.Insert(0, "A");
    ArrList.Insert(1, "D");
    ArrList.Insert(2, "E");
    ArrList.Insert(3, "G");

    // Initializes a new Stack
    // as collection
    Stack s = new Stack();

    // pushing values in the stack
    // values are pop as B, C
    s.Push("C");
    s.Push("B");

    // Displays the ArrayList and the Queue.
    Console.WriteLine("The ArrayList initially has:");
    Display(ArrList);
    Console.WriteLine("The collection initially has:");
    Display(s);

    // Copies the elements of the stack 
    // to the ArrayList at index 1.
    ArrList.InsertRange(1, s);

    // Displays the ArrayList.
    Console.WriteLine("After insert the collection in the ArrList:");
    Display(ArrList);

    // insert F by finding the index of G
    // using IndexOf() method
    ArrList.Insert(ArrList.IndexOf("G"), "F");
    Console.WriteLine("After inserting F before G:");
    Display(ArrList);
}

// Display function
public static void Display(IEnumerable ArrList)
{
    foreach(Object a in ArrList)
    {
        Console.Write(" " + a);
    }
    Console.WriteLine();
}

}

`

Output:

The ArrayList initially has: A D E G The collection initially has: B C After insert the collection in the ArrList: A B C D E G After inserting F before G: A B C D E F G

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.arraylist.insertrange?view=netframework-4.8