C# | Dictionary.Clear Method

Last Updated : 01 Feb, 2019

This method is used to remove all key/value pairs from the Dictionary<TKey,TValue>.

Syntax:

public void Clear ();

Below are the programs to illustrate the use of above-discussed method:

Example 1:

// C# code to remove all pairs 
// from Dictionary 
using System; 
using System.Collections.Generic; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Create a new dictionary of 
        // strings, with string keys. 
        Dictionary<string, string> myDict =  
          new Dictionary<string, string>(); 
  
        // Adding key/value pairs in myDict 
        myDict.Add("Australia", "Canberra"); 
        myDict.Add("Belgium", "Brussels"); 
        myDict.Add("Netherlands", "Amsterdam"); 
        myDict.Add("China", "Beijing"); 
        myDict.Add("Russia", "Moscow"); 
        myDict.Add("India", "New Delhi"); 
  
        // To get count of key/value pairs in myDict 
        Console.WriteLine("Total key/value pairs "+ 
                "in myDict are : " + myDict.Count); 
  
        // Remove all pairs from the Dictionary 
        myDict.Clear(); 
  
        Console.WriteLine("After clear operation"); 
  
        // To get count of key/value pairs in myDict 
        Console.WriteLine("Total key/value pairs in"+ 
                   " myDict  are : " + myDict.Count); 
    } 
} 

Output:

Total key/value pairs in myDict are : 6
After clear operation
Total key/value pairs in myDict  are : 0

Example 2:

// C# code to remove all pairs 
// from Dictionary 
using System; 
using System.Collections.Generic; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Create a new dictionary of  
        // strings, with string keys. 
        Dictionary<int, int> myDict = 
           new Dictionary<int, int>(); 
  
        // Adding key/value pairs in myDict 
        myDict.Add(9, 8); 
        myDict.Add(3, 4); 
        myDict.Add(4, 7); 
        myDict.Add(1, 7); 
  
        // To get count of key/value pairs in myDict 
        Console.WriteLine("Total key/value pairs "+ 
                "in myDict are : " + myDict.Count); 
  
        // Remove all pairs from the Dictionary 
        myDict.Clear(); 
  
        Console.WriteLine("After clear operation"); 
  
        // To get count of key/value pairs in myDict 
        Console.WriteLine("Total key/value pairs"+ 
             " in myDict  are : " + myDict.Count); 
    } 
} 

Output:

Total key/value pairs in myDict are : 4
After clear operation
Total key/value pairs in myDict  are : 0

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.clear?view=netframework-4.7.2

Suggest improvement

C# | SortedDictionary.Remove() Method

C# | Dictionary.Count Property

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