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Set the capacity to the actual number of elements in the ArrayList in C#?
To set the capacity to the actual number of elements 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);
}
Console.WriteLine("Count of elements in ArrayList2 = " + list2.Count);
list2.RemoveAt(5);
Console.WriteLine("Count of elements in ArrayList2 (Updated) = " + list2.Count);
Console.WriteLine("Enumerator iterating the ArrayList2...");
IEnumerator demoEnum = list2.GetEnumerator();
while (demoEnum.MoveNext()) {
Console.WriteLine(demoEnum.Current);
}
Console.WriteLine("Capacity of ArrayList2 = " + list2.Capacity);
list2.TrimToSize();
Console.WriteLine("Capacity of ArrayList2 (updated) = " + list2.Capacity);
}
}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 Count of elements in ArrayList2 = 9 Count of elements in ArrayList2 (Updated) = 8 Enumerator iterating the ArrayList2... A B C D E G H I Capacity of ArrayList2 = 16 Capacity of ArrayList2 (updated) = 8
Example
Let us now see another example −
using System;
using System.Collections;
public class Demo {
public static void Main() {
ArrayList list = new ArrayList();
list.Add("One");
list.Add("Two");
list.Add("Three");
list.Add("Four");
list.Add("Five");
list.Add("Six");
list.Add("Seven");
list.Add("Eight");
Console.WriteLine("ArrayList elements...");
foreach(string str in list) {
Console.WriteLine(str);
}
Console.WriteLine("ArrayList is read-only? = "+list.IsReadOnly);
Console.WriteLine("Does the element Six in the ArrayList? = "+list.Contains("Six"));
list.Insert(4, "Twelve");
Console.WriteLine("ArrayList elements...UPDATED");
foreach(string str in list) {
Console.WriteLine(str);
}
Console.WriteLine("Capacity of ArrayList = " + list.Capacity);
list.TrimToSize();
Console.WriteLine("Capacity of ArrayList (updated) = " + list.Capacity);
}
}Output
This will produce the following output −
ArrayList elements... One Two Three Four Five Six Seven Eight ArrayList is read-only? = False Does the element Six in the ArrayList? = True ArrayList elements...UPDATED One Two Three Four Twelve Five Six Seven Eight Capacity of ArrayList = 16 Capacity of ArrayList (updated) = 9
Updated on: 16-Dec-2019
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