How to Get the Size (Number of Key-Value Pairs) of a Dictionary in C#

How to Get the Size (Number of Key-Value Pairs) of a Dictionary in C# ?

Answer

To get the size (number of key-value pairs) of a dictionary in C#, you can use the `Count` property of the `Dictionary` class from the `System.Collections.Generic` namespace. This property returns the number of key-value pairs in the dictionary.

✐ Examples

1 Getting the Size of a Dictionary Using the `Count` Property

We can get the size of a dictionary in C# using the `Count` property. This example demonstrates how to declare and initialize a dictionary, use the `Count` property to get the number of key-value pairs, and print the size.

For example,

We start by including the necessary namespace: using System.Collections.Generic;.
We declare and initialize a dictionary named myDictionary with integer keys and string values.
We use the `Count` property to get the number of key-value pairs in the dictionary.
We print the size of the dictionary.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // Declare and initialize a dictionary
        Dictionary<int, string> myDictionary = new Dictionary<int, string>
        {
            {1, "One"},
            {2, "Two"},
            {3, "Three"}
        };

        // Get the size of the dictionary using the Count property
        int size = myDictionary.Count;

        // Print the size of the dictionary
        Console.WriteLine("The size of the dictionary is {0}.", size);
    }
}

Output

The size of the dictionary is 3.

2 Getting the Size of an Empty Dictionary

We can get the size of an empty dictionary in C# using the `Count` property. This example demonstrates how to declare and initialize an empty dictionary, use the `Count` property to get the number of key-value pairs, and print the size.

For example,

We start by including the necessary namespace: using System.Collections.Generic;.
We declare and initialize an empty dictionary named myDictionary.
We use the `Count` property to get the number of key-value pairs in the dictionary.
We print the size of the dictionary.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // Declare and initialize an empty dictionary
        Dictionary<int, string> myDictionary = new Dictionary<int, string>();

        // Get the size of the dictionary using the Count property
        int size = myDictionary.Count;

        // Print the size of the dictionary
        Console.WriteLine("The size of the dictionary is {0}.", size);
    }
}

Output

The size of the dictionary is 0.

Summary

In this tutorial, we learned How to Get the Size (Number of Key-Value Pairs) of a Dictionary in C# language with well detailed examples.

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How to Get the Size (Number of Key-Value Pairs) of a Dictionary in C#