C# | Getting a subset of the elements from the source ArrayList

ArrayList.GetRange(Int32, Int32) Method is used to get an ArrayList which will represent a subset of the elements in the source ArrayList.

Syntax: 

public virtual System.Collections.ArrayList GetRange (int index, int count);

Parameters:

index: It is of Int32 type and represents the zero-based ArrayList index at which the range starts.
count: It is of Int32 type and represents the number of elements in the range.

Return Value: This method returns an ArrayList which represents a subset of the elements in the source ArrayList.

Exceptions:

  • ArgumentOutOfRangeException: If the value of the index is less than zero, or if the value of count is less than zero.
  • ArgumentException: If the value of an index and count does not denote a valid range of elements in the ArrayList.

Below programs illustrate the above-discussed method:

Example 1:

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// C# program to illustrate the
// concept of GetRange() Method
using System;
using System.Collections;
  
class GFG {
  
    // Main method
    public static void Main()
    {
  
        // Creates and initializes
        // a new ArrayList.
        ArrayList myarraylist = new ArrayList();
        myarraylist.Add("Welcome");
        myarraylist.Add("to");
        myarraylist.Add("Geeks");
        myarraylist.Add("for");
        myarraylist.Add("Geeks");
        myarraylist.Add("portal");
  
        // Creates and initializes queue
        Queue mynewList = new Queue();
        mynewList.Enqueue("This");
        mynewList.Enqueue("is");
        mynewList.Enqueue("C#");
        mynewList.Enqueue("tutorial");
  
        // Displays the values of six 
        // elements starting at index 0.
        ArrayList newarraylist = myarraylist.GetRange(0, 6);
        Console.WriteLine("Elements are:");
        Displaydata(newarraylist, '\n');
  
        // Replaces the values of six elements 
        // starting at index 1 with the values
        // in the queue.
        myarraylist.SetRange(2, mynewList);
  
        // Displays the values of six 
        // elements starting at index 0.
        newarraylist = myarraylist.GetRange(0, 6);
        Console.WriteLine("\nNow elements are:");
        Displaydata(newarraylist, '\n');
    }
  
    public static void Displaydata(IEnumerable myvalueList,
                                          char mySeparator)
    {
        foreach(Object obj in myvalueList)
            Console.Write("{0}{1}", mySeparator, obj);
        Console.WriteLine();
    }
}

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Output:


Elements are:

Welcome
to
Geeks
for
Geeks
portal

Now elements are:

Welcome
to
This
is
C#
tutorial



Example 2:











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// C# program to illustrate the 


// concept of GetRange() Method 


using System; 


using System.Collections; 


  


class GFG { 


  


    // Main method 


    public static void Main() 


    { 


  


        // Creates and initializes a new ArrayList. 


        ArrayList myarraylist = new ArrayList(); 


        myarraylist.Add("Welcome"); 


        myarraylist.Add("to"); 


        myarraylist.Add("Geeks"); 


        myarraylist.Add("for"); 


        myarraylist.Add("Geeks"); 


        myarraylist.Add("portal"); 


  


        // Creates and initializes queue 


        Queue mynewList = new Queue(); 


        mynewList.Enqueue("This"); 


        mynewList.Enqueue("is"); 


        mynewList.Enqueue("C#"); 


        mynewList.Enqueue("tutorial"); 


  


        // Displays the values of six elements 


        ArrayList newarraylist = myarraylist.GetRange(-1, 6); 


        Console.WriteLine("Elements are:"); 


        Displaydata(newarraylist, '\n'); 


  


        // Replaces the values of six elements  


        // starting at index 1 with the  


        // values in the queue. 


        myarraylist.SetRange(2, mynewList); 


  


        // Displays the values of six  


        // elements starting at index 0. 


        newarraylist = myarraylist.GetRange(0, 6); 


        Console.WriteLine("Now elements are:"); 


        Displaydata(newarraylist, '\n'); 


    } 


  


    public static void Displaydata(IEnumerable myvalueList,  


                                          char mySeparator) 


    { 


        foreach(Object obj in myvalueList) 


            Console.Write("{0}{1}", mySeparator, obj); 


        Console.WriteLine(); 


    } 


} 



















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Runtime Error:



Unhandled Exception:

System.ArgumentOutOfRangeException: Non-negative number required.

Parameter name: index



Reference:




          
          
          
          

            

    

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