How To Get And Set Size Of A C# List

C# List<T> class provides methods and properties to create a list of objects (classes).

 

List is a generic class. You must import the following namespace before using the List<T> class.

using System.Collections.Generic;

List.Capacity

 

The Capacity property gets and sets the number of items a list can hold without resizing. Capacity is always greater than or equal to the Count value.

 

The following code snippet creates a List of authors and displays the original capacity. After that, code removes the excess capacity by calling TrimExcess method. After that, capacity is set to 20.

using System;
using System.Collections.Generic;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a list of strings
            List<string> AuthorList = new List<string>();
            AuthorList.Add("Mahesh Chand");
            AuthorList.Add("Praveen Kumar");
            AuthorList.Add("Raj Kumar");
            AuthorList.Add("Nipun Tomar");
            AuthorList.Add("Dinesh Beniwal");

            // Original Capacity
            Console.WriteLine($"Original Capacity: {AuthorList.Capacity}");

            // Trim excess
            AuthorList.TrimExcess();
            Console.WriteLine($"Trimmed Capacity: {AuthorList.Capacity}");

            // Update Capacity
            AuthorList.Capacity = 20;
            Console.WriteLine(AuthorList.Capacity);
            Console.WriteLine($"Updated Capacity: {AuthorList.Capacity}");
        }
    }
}

The output from above code listing is shown in below figure.

 

 

 

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