C# | Remove all elements from the Collection<T>

Collection<T>.Clear method is used to remove all elements from the Collection<T>.

Syntax:

public void Clear ();

Below given are some examples to understand the implementation in a better way:

Example 1:

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// C# code to remove all
// elements from the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
        // Creating a collection of strings
        Collection<string> myColl = new Collection<string>();
  
        // Adding elements in Collection myColl
        myColl.Add("A");
        myColl.Add("B");
        myColl.Add("C");
        myColl.Add("D");
        myColl.Add("E");
  
        // To print the count of elements in Collection
        Console.WriteLine("Count : " + myColl.Count);
  
        // Displaying the elements in myColl
        foreach(string str in myColl)
        {
            Console.WriteLine(str);
        }
  
        // Removing all the elements from Collection
        myColl.Clear();
  
        // To print the count of elements in Collection
        Console.WriteLine("Count : " + myColl.Count);
  
        // Displaying the elements in myColl
        foreach(string str in myColl)
        {
            Console.WriteLine(str);
        }
    }
}

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Output:




Count : 5
A
B
C
D
E
Count : 0



Example 2:











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// C# code to remove all 


// elements from the Collection 


using System; 


using System.Collections.Generic; 


using System.Collections.ObjectModel; 


  


class GFG { 


  


    // Driver code 


    public static void Main() 


    { 


        // Creating a collection of ints 


        Collection<int> myColl = new Collection<int>(); 


  


        // Adding elements in Collection myColl 


        myColl.Add(2); 


        myColl.Add(3); 


        myColl.Add(4); 


        myColl.Add(5); 


  


        // To print the count of elements in Collection 


        Console.WriteLine("Count : " + myColl.Count); 


  


        // Displaying the elements in myColl 


        foreach(int i in myColl) 


        { 


            Console.WriteLine(i); 


        } 


  


        // Removing all the elements from Collection 


        myColl.Clear(); 


  


        // To print the count of elements in Collection 


        Console.WriteLine("Count : " + myColl.Count); 


  


        // Displaying the elements in myColl 


        foreach(int i in myColl) 


        { 


            Console.WriteLine(i); 


        } 


    } 


} 



















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Output:


Count : 4
2
3
4
5
Count : 0



Note:


    

  • Count is set to zero, and references to other objects from elements of the collection are also released. 
    • 

  • This method is an O(n) operation, where n is Count.
    • 



Reference:






    

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