C# | Count the number of key/value pairs in the Hashtable

The Hashtable class represents a collection of key-and-value pairs that are organized based on the hash code of the key. The key is used to access the items in the collection. Hashtable.Count Property is used to get the total number of the key/value pairs contained in the Hashtable.

Syntax:

myTable.Count

Here, myTable is the name of the Hashtable.

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

Example 1:

// C# code to get the number of key-and-value
// pairs contained in the Hashtable.
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Hashtable
        Hashtable myTable = new Hashtable();

        // Adding elements in Hashtable
        myTable.Add("2", "Even & Prime");
        myTable.Add("3", "Odd & Prime");
        myTable.Add("4", "Even & non-prime");
        myTable.Add("9", "Odd & non-prime");

        // To get the number of key-and-value
        // pairs contained in the Hashtable.
        Console.WriteLine(myTable.Count);
    }
}

Output:

4

Example 2:

// C# code to get the number of key-and-value
// pairs contained in the Hashtable.
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating an empty Hashtable
        Hashtable myTable = new Hashtable();

        // To get the number of key-and-value
        // pairs contained in the Hashtable.
        Console.WriteLine(myTable.Count);
    }
}

Output:

0

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.hashtable.count?view=netframework-4.7.2