C# | SortedDictionary.Clear() Method

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

Syntax:

public void Clear ();

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

Example 1:

// C# code to remove all pairs
// from SortedDictionary
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Create a new dictionary of
        // strings, with string keys.
        SortedDictionary<string, string> myDict =
          new SortedDictionary<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 SortedDictionary
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Create a new SortedDictionary of
        // int, with int keys.
        SortedDictionary<int, int> myDict =
           new SortedDictionary<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.sorteddictionary-2.clear?view=netframework-4.7.2