How to Convert an Array of Key-Value Pairs to a Dictionary in C# - Step by Step Examples

How to Convert an Array of Key-Value Pairs to a Dictionary in C# ?

Answer

To convert an array of key-value pairs to a dictionary in C#, you can use the `ToDictionary` method from the `System.Linq` namespace. This allows you to create a dictionary from a collection of key-value pairs stored in an array.

✐ Examples

1 Converting an Array of Arrays to a Dictionary

We can convert an array of key-value pairs to a dictionary in C# using the `ToDictionary` method. This example demonstrates how to declare and initialize an array of key-value pairs, use the `ToDictionary` method to convert the array to a dictionary, and print the resulting dictionary.

For example,

We start by including the necessary namespaces: using System.Collections.Generic; and using System.Linq;.
We declare and initialize an array of key-value pairs named pairs. In this example, the pairs are represented as arrays with two elements: a key and a value.
We use the `ToDictionary` method to convert the array to a dictionary.
We print the resulting dictionary.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        // Declare and initialize an array of key-value pairs
        var pairs = new[]
        {
            new[] { 1, 10 },
            new[] { 2, 20 },
            new[] { 3, 30 }
        };

        // Convert the array to a dictionary using ToDictionary
        Dictionary<int, int> myDictionary = pairs.ToDictionary(pair => pair[0], pair => pair[1]);

        // Print the resulting dictionary
        Console.WriteLine("Dictionary from array of pairs:");
        foreach (var kvp in myDictionary)
        {
            Console.WriteLine("Key: {0}, Value: {1}", kvp.Key, kvp.Value);
        }
    }
}

Output

Dictionary from array of pairs:
Key: 1, Value: 10
Key: 2, Value: 20
Key: 3, Value: 30

2 Converting an Array of KeyValuePair to a Dictionary

We can convert an array of `KeyValuePair` to a dictionary in C# using the `ToDictionary` method. This example demonstrates how to declare and initialize an array of `KeyValuePair`, use the `ToDictionary` method to convert the array to a dictionary, and print the resulting dictionary.

For example,

We start by including the necessary namespaces: using System.Collections.Generic; and using System.Linq;.
We declare and initialize an array of `KeyValuePair` named pairs.
We use the `ToDictionary` method to convert the array to a dictionary.
We print the resulting dictionary.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        // Declare and initialize an array of KeyValuePair
        var pairs = new[]
        {
            new KeyValuePair<int, int>(1, 10),
            new KeyValuePair<int, int>(2, 20),
            new KeyValuePair<int, int>(3, 30)
        };

        // Convert the array to a dictionary using ToDictionary
        Dictionary<int, int> myDictionary = pairs.ToDictionary(pair => pair.Key, pair => pair.Value);

        // Print the resulting dictionary
        Console.WriteLine("Dictionary from array of KeyValuePair:");
        foreach (var kvp in myDictionary)
        {
            Console.WriteLine("Key: {0}, Value: {1}", kvp.Key, kvp.Value);
        }
    }
}

Output

Dictionary from array of KeyValuePair:
Key: 1, Value: 10
Key: 2, Value: 20
Key: 3, Value: 30

3 Converting an Array of Tuples to a Dictionary

We can convert an array of tuples to a dictionary in C# using the `ToDictionary` method. This example demonstrates how to declare and initialize an array of tuples, use the `ToDictionary` method to convert the array to a dictionary, and print the resulting dictionary.

For example,

We start by including the necessary namespaces: using System.Collections.Generic; and using System.Linq;.
We declare and initialize an array of tuples named pairs.
We use the `ToDictionary` method to convert the array to a dictionary.
We print the resulting dictionary.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        // Declare and initialize an array of tuples
        var pairs = new[]
        {
            (1, 10),
            (2, 20),
            (3, 30)
        };

        // Convert the array to a dictionary using ToDictionary
        Dictionary<int, int> myDictionary = pairs.ToDictionary(pair => pair.Item1, pair => pair.Item2);

        // Print the resulting dictionary
        Console.WriteLine("Dictionary from array of tuples:");
        foreach (var kvp in myDictionary)
        {
            Console.WriteLine("Key: {0}, Value: {1}", kvp.Key, kvp.Value);
        }
    }
}

Output

Dictionary from array of tuples:
Key: 1, Value: 10
Key: 2, Value: 20
Key: 3, Value: 30

Summary

In this tutorial, we learned How to Convert an Array of Key-Value Pairs to a Dictionary in C# language with well detailed examples.

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