How to remove elements from a list in C#

The List<T> class in C# represents a collection of items that can be indexed, searched, sorted, and manipulated. The class provides three methods to allow the removal of elements from the list:

  • List.Remove()
  • List.RemoveAt()
  • List.Clear()

List.Remove()

The Remove() method takes an item as a ​parameter and removes the first occurrence of that item from the list

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Code

The code snippet below illustrates the usage of the Remove() method:

using System.Collections.Generic;
class RemoveDemo
{
    static void Main()
    {
      // Creating a list of strings
      List<string> Fruits = new List<string>();
      // Adding items to the list
      Fruits.Add("Apple");    
      Fruits.Add("Banana");
      Fruits.Add("Mango");   
      System.Console.WriteLine("Original List:");
      // Printing the list
      Fruits.ForEach(System.Console.WriteLine); 
      // Calling the Remove() method
      Fruits.Remove("Banana");
      System.Console.WriteLine();
      System.Console.WriteLine("After removing Banana:");
      // Printing the list
      Fruits.ForEach(System.Console.WriteLine); 
    }
}

List.RemoveAt()

The RemoveAt() method takes a zero-based index number as a ​parameter and removes the item at that index.

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Code

The code snippet below illustrates the usage of the RemoveAt() method:

using System.Collections.Generic;
class RemoveDemo
{
    static void Main()
    {
      // Creating a list of strings
      List<string> Fruits = new List<string>();
      // Adding items to the list
      Fruits.Add("Apple");    
      Fruits.Add("Banana");
      Fruits.Add("Mango");   
      System.Console.WriteLine("Original List:");
      // Printing the list
      Fruits.ForEach(System.Console.WriteLine); 
      // Calling RemoveAt() method
      Fruits.RemoveAt(1);
      System.Console.WriteLine();
      System.Console.WriteLine("After removing item at index 1:");
      // Printing the list
      Fruits.ForEach(System.Console.WriteLine); 
    }
}

List.Clear()

The Clear() method removes all elements from the list.

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Code

The code snippet below illustrates the method of the Clear() method:

using System.Collections.Generic;
class RemoveDemo
{
    static void Main()
    {
      // Creating a list of strings
      List<string> Fruits = new List<string>();
      // Adding items to the list
      Fruits.Add("Apple");    
      Fruits.Add("Banana");
      Fruits.Add("Mango");   
      System.Console.WriteLine("Original List:");
      // Printing the list
      Fruits.ForEach(System.Console.WriteLine); 
      // Calling RemoveAt() function
      Fruits.Clear();
      System.Console.WriteLine();
      System.Console.WriteLine("After clearing the list:");
      // Printing the list
      Fruits.ForEach(System.Console.WriteLine); 
    }
}

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