C# | Get or set the element at the specified index in ArrayList
ArrayList.Item[Int32] Property is used to get or set the element at the specified index in ArrayList.
Syntax:
public virtual object this[int index] { get; set; }
Here, index is the zero-based index of the element to get or set.
Return Value: It returns the element of Object type at the specified index.
Exception: This property will throw ArgumentOutOfRangeException if the index is less than zero or is equal to or greater than Count.
Below programs illustrate the use of above-discussed property:
Example 1:
// C# code to get or set the element at // the specified index in ArrayList using System; using System.Collections; class GFG { // Driver code public static void Main() { // Creating an ArrayList ArrayList myList = new ArrayList(); // Adding elements to ArrayList myList.Add("A"); myList.Add("B"); myList.Add("C"); myList.Add("D"); myList.Add("E"); myList.Add("F"); // Displaying the elements // in the ArrayList foreach(string str in myList) { Console.WriteLine(str); } Console.WriteLine("After Item[int32] Property: "); // setting the value at index 2 myList[2] = "Z"; // Displaying the elements // in the ArrayList foreach(string str in myList) { Console.WriteLine(str); } } } |
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Output:
A B C D E F After Item[int32] Property: A B Z D E F
Example 2:
// C# code to get or set the element at // the specified index in ArrayList using System; using System.Collections; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating an ArrayList ArrayList myList = new ArrayList(); // Adding elements to ArrayList // Adding elements to ArrayList myList.Add(2); myList.Add(4); myList.Add(6); myList.Add(8); myList.Add(10); myList.Add(12); myList.Add(14); myList.Add(16); myList.Add(18); myList.Add(20); // Displaying the elements // in the ArrayList foreach(int i in myList) { Console.WriteLine(i); } Console.WriteLine("After Item[int32] Property: "); // setting the value at index 8 // this will give error as index // is greater than count myList[10] = 56; // Displaying the elements // in the ArrayList foreach(int j in myList) { Console.WriteLine(j); } } } |
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Runtime Error:
Unhandled Exception:
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Reference:
