How to create a Dictionary with Initial Key-Value Pairs in C# - Step by Step Examples

How to create a Dictionary with Initial Key-Value Pairs in C# ?

Answer

To create a dictionary with initial key-value pairs in C#, you can use the `Dictionary` class from the `System.Collections.Generic` namespace and initialize it with a collection initializer.

✐ Examples

1 Creating a Dictionary with Integer Keys and String Values

We can create a dictionary in C# with initial key-value pairs where the keys are integers and the values are strings. This example demonstrates how to initialize a dictionary with key-value pairs and print its contents.

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 using a collection initializer.
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 a dictionary with key-value pairs
        Dictionary<int, string> myDictionary = new Dictionary<int, string>
        {
            {1, "One"},
            {2, "Two"},
            {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 a Dictionary with String Keys and Double Values

We can create a dictionary in C# with initial key-value pairs where the keys are strings and the values are doubles. This example demonstrates how to initialize a dictionary with key-value pairs and print its contents.

For example,

We start by including the necessary namespace: using System.Collections.Generic;.
We declare and initialize a dictionary named myDictionary with string keys and double values using a collection initializer.
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 a dictionary with key-value pairs
        Dictionary<string, double> myDictionary = new Dictionary<string, double>
        {
            {"A", 1.1},
            {"B", 2.2},
            {"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 a Dictionary with Initial Key-Value Pairs in C# language with well detailed examples.

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How to create a Dictionary with Initial Key-Value Pairs in C# - Step by Step Examples