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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.
  1. 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.
  1. using System;  
  2. using System.Collections.Generic;  
  3. namespace ConsoleApp1  
  4. {  
  5.     class Program  
  6.     {  
  7.         static void Main(string[] args)  
  8.         {  
  9.             // Create a list of strings  
  10.             List<string> AuthorList = new List<string>();  
  11.             AuthorList.Add("Mahesh Chand");  
  12.             AuthorList.Add("Praveen Kumar");  
  13.             AuthorList.Add("Raj Kumar");  
  14.             AuthorList.Add("Nipun Tomar");  
  15.             AuthorList.Add("Dinesh Beniwal");  
  16.   
  17.             // Original Capacity  
  18.             Console.WriteLine($"Original Capacity: {AuthorList.Capacity}");  
  19.   
  20.             // Trim excess  
  21.             AuthorList.TrimExcess();  
  22.             Console.WriteLine($"Trimmed Capacity: {AuthorList.Capacity}");  
  23.   
  24.             // Update Capacity  
  25.             AuthorList.Capacity = 20;  
  26.             Console.WriteLine(AuthorList.Capacity);  
  27.             Console.WriteLine($"Updated Capacity: {AuthorList.Capacity}");  
  28.         }  
  29.     }  
  30. }  
The output from above code listing is shown in below figure.
 
 
 

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