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Get the number of elements actually contained in the ArrayList in C#
To get the number of elements actually contained in the ArrayList, the code is as follows −
Example
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args){
ArrayList list1 = new ArrayList();
list1.Add("A");
list1.Add("B");
list1.Add("C");
list1.Add("D");
list1.Add("E");
list1.Add("F");
list1.Add("G");
list1.Add("H");
list1.Add("I");
Console.WriteLine("Elements in ArrayList1...");
foreach (string res in list1){
Console.WriteLine(res);
}
ArrayList list2 = new ArrayList();
list2.Add("A");
list2.Add("B");
list2.Add("C");
list2.Add("D");
list2.Add("E");
list2.Add("F");
list2.Add("G");
list2.Add("H");
list2.Add("I");
Console.WriteLine("Elements in ArrayList2...");
foreach (string res in list2){
Console.WriteLine(res);
}
ArrayList list3 = new ArrayList();
Console.WriteLine("Current capacity of ArrayList3: " + list3.Capacity);
list3 = list2;
Console.WriteLine("Current capacity of ArrayList3 (Updated) " + list3.Capacity);
Console.WriteLine("Is ArrayList3 equal to ArrayList2? = "+list3.Equals(list2));
Console.WriteLine("Count of elements in ArrayList2 = " + list2.Count);
list2.Clear();
Console.WriteLine("Count of elements in ArrayList2 (Updated) = " + list2.Count);
}
}Output
This will produce the following output −
Elements in ArrayList1... A B C D E F G H I Elements in ArrayList2... A B C D E F G H I Current capacity of ArrayList3: 0 Current capacity of ArrayList3: 16 Is ArrayList3 equal to ArrayList2? = True Count of elements in ArrayList2 = 9 Count of elements in ArrayList2 (Updated) = 0
Example
Let us see another example −
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args){
ArrayList list1 = new ArrayList();
list1.Add("A");
list1.Add("B");
list1.Add("C");
list1.Add("D");
list1.Add("E");
list1.Add("F");
list1.Add("G");
list1.Add("H");
list1.Add("I");
Console.WriteLine("Current capacity of ArrayList1: " + list1.Capacity);
Console.WriteLine("Elements in ArrayList1...");
foreach (string res in list1){
Console.WriteLine(res);
}
ArrayList list2 = new ArrayList();
list2.Add("A");
list2.Add("B");
list2.Add("C");
list2.Add("D");
list2.Add("E");
list2.Add("F");
list2.Add("G");
list2.Add("H");
list2.Add("I");
Console.WriteLine("Elements in ArrayList2...");
foreach (string res in list2){
Console.WriteLine(res);
}
ArrayList list3 = new ArrayList();
list3 = list2;
Console.WriteLine("Is ArrayList3 equal to ArrayList2? = "+list3.Equals(list2));
}
}Output
This will produce the following output −
Current capacity of ArrayList1: 16 Elements in ArrayList1... A B C D E F G H I Elements in ArrayList2... A B C D E F G H I Is ArrayList3 equal to ArrayList2? = True
Updated on: 06-Dec-2019
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