C# | Get the number of key/value pairs contained in ListDictionary

ListDictionary.Count property is used to get the number of key/value pairs contained in the ListDictionary.

Syntax:

public int Count { get; }

Return Value : The number of key/value pairs contained in the ListDictionary.

Below are the programs to illustrate the use of ListDictionary.Count property:

Example 1:

// C# code to get the number
// of key/value pairs contained
// in the ListDictionary
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a ListDictionary named myDict
        ListDictionary myDict = new ListDictionary();

        // 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");

        // Displaying the number of key/value
        // pairs contained in the ListDictionary
        Console.WriteLine(myDict.Count);
    }
}

Output:

6

Example 2:

// C# code to get the number
// of key/value pairs contained
// in the ListDictionary
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a ListDictionary named myDict
        ListDictionary myDict = new ListDictionary();

        // Adding key/value pairs in myDict
        myDict.Add("I", "first");
        myDict.Add("II", "second");
        myDict.Add("III", "third");
        myDict.Add("IV", "fourth");
        myDict.Add("V", "fifth");

        // Displaying the number of key/value
        // pairs contained in the ListDictionary
        Console.WriteLine(myDict.Count);
    }
}

Output:

5

Note: Retrieving the value of this property is an O(1) operation.

Reference:

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