How to create an Empty Dictionary in C# - Step by Step Examples

How to create an Empty Dictionary in C# ?

Answer

To create an empty dictionary in C#, you can use the `Dictionary` class from the `System.Collections.Generic` namespace. You can specify the types for the keys and values in the dictionary.

✐ Examples

1 Creating an Empty Dictionary with Integer Keys and String Values

We can create an empty dictionary in C# where the keys are integers and the values are strings. This example demonstrates how to initialize an empty dictionary and add key-value pairs to it.

For example,

We start by including the necessary namespace: using System.Collections.Generic;.
We declare and initialize an empty dictionary named myDictionary with integer keys and string values.
We add some key-value pairs to the dictionary using the Add method.
We print the dictionary contents to verify the key-value pairs.

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>();

        // Add key-value pairs to the dictionary
        myDictionary.Add(1, "One");
        myDictionary.Add(2, "Two");
        myDictionary.Add(3, "Three");

        // Print the dictionary contents
        Console.WriteLine("Dictionary contents:");
        foreach (KeyValuePair<int, string> kvp in myDictionary)
        {
            Console.WriteLine("Key: {0}, Value: {1}", kvp.Key, kvp.Value);
        }
    }
}

Output

Dictionary contents:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three

2 Creating an Empty Dictionary with String Keys and Double Values

We can create an empty dictionary in C# where the keys are strings and the values are doubles. This example demonstrates how to initialize an empty dictionary and add key-value pairs to it.

For example,

We start by including the necessary namespace: using System.Collections.Generic;.
We declare and initialize an empty dictionary named myDictionary with string keys and double values.
We add some key-value pairs to the dictionary using the Add method.
We print the dictionary contents to verify the key-value pairs.

C# Program

using System;
using System.Collections.Generic;

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

        // Add key-value pairs to the dictionary
        myDictionary.Add("A", 1.1);
        myDictionary.Add("B", 2.2);
        myDictionary.Add("C", 3.3);

        // Print the dictionary contents
        Console.WriteLine("Dictionary contents:");
        foreach (KeyValuePair<string, double> kvp in myDictionary)
        {
            Console.WriteLine("Key: {0}, Value: {1}", kvp.Key, kvp.Value);
        }
    }
}

Output

Dictionary contents:
Key: A, Value: 1.1
Key: B, Value: 2.2
Key: C, Value: 3.3

Summary

In this tutorial, we learned How to create an Empty Dictionary in C# language with well detailed examples.

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How to create an Empty Dictionary in C# - Step by Step Examples