C# | Copy the elements of collection over a range of elements in ArrayList

ArrayList.SetRange(Int32, ICollection) Method is used to copy the elements of a collection over a range of elements in the ArrayList.

Syntax:

public virtual void SetRange (int index, System.Collections.ICollection c);

Parameters:

index: It is a zero-based ArrayList index at which to start copying the elements of c. The type of this parameter is System.Int32.

c: It is an ICollection whose elements to copy to the ArrayList. The collection itself cannot be null, but it can contain elements that are null.

Exceptions:

• ArgumentNullException: If the value of c is null.
• NotSupportedException: If the ArrayList is read-only.
• ArgumentOutOfRangeException: If the index is less than zero or [index + number of elements in c] > Count.

Below given are some examples to understand the implementation in a better way:

Example 1:

// C# Program to illustrate the
// SetRange() Method
using System;
using System.Collections;

class GFG {

    // Main method
    public static void Main()
    {

        // Create and initialize ArrayList
        ArrayList mylist = new ArrayList();
        mylist.Add("G");
        mylist.Add("e");
        mylist.Add("e");
        mylist.Add("k");
        mylist.Add("s");
        mylist.Add("G");
        mylist.Add("F");
        mylist.Add("G");

        // There are total 4 elements
        string[] str = { "This", "is", "C#", "Tutorial" };

        // using SetRange() Method
        // starting from index 0
        mylist.SetRange(0, str);

        Show("ArrayList is", mylist);
    }

    // show method to display the result
    static void Show(string arr, ArrayList mylist)
    {
        for (int j = 0; j < mylist.Count; j++) {

            Console.WriteLine(arr + "[" + j + "] = " + mylist[j]);
        }
    }
}

Output:

ArrayList is[0] = This
ArrayList is[1] = is
ArrayList is[2] = C#
ArrayList is[3] = Tutorial
ArrayList is[4] = s
ArrayList is[5] = G
ArrayList is[6] = F
ArrayList is[7] = G

Example 2:

// C# Program to illustrate the
// SetRange() Method
using System;
using System.Collections;

class GFG {
    // Main method
    public static void Main()
    {
        // Create and initialize ArrayList
        ArrayList mylist1 = new ArrayList();
        mylist1.Add("Hello ");
        mylist1.Add("Welcome ");
        mylist1.Add("to ");
        mylist1.Add("online ");
        mylist1.Add("portal ");
        mylist1.Add("of ");
        mylist1.Add("Geeks ");
        mylist1.Add("for ");
        mylist1.Add("Geeks ");

        // Create and initialize new ArrayList
        ArrayList mylist2 = new ArrayList();
        mylist2.Add("This ");
        mylist2.Add("is ");
        mylist2.Add("C# ");
        mylist2.Add("tutorial");
        mylist2.Add(".");

        // Displays the values of 6
        // elements of mylist1 starting
        // at index 0.
        ArrayList result = mylist1.GetRange(0, 6);

        Console.WriteLine("String from index number 0 to 6:");
        {
            foreach(Object obj in result)
                Console.Write("{0}", obj);
            Console.WriteLine();
        }

        // Replace the value of 5 element
        // starting from index 1
        // with the values in mylist2
        mylist1.SetRange(1, mylist2);

        // Display the result
        result = mylist1.GetRange(0, 6);
        Console.WriteLine("After SetRange() Method:");
        {
            foreach(Object obj in result)
                Console.Write("{0}", obj);
            Console.WriteLine();
        }
    }
}

Output:

String from index number 0 to 6:
Hello Welcome to online portal of 
After SetRange() Method:
Hello This is C# tutorial.

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.arraylist.setrange?view=netframework-4.7.2