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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
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