How to Check if Two Dictionaries are Equal in C#

How to Check if Two Dictionaries are Equal in C# ?

Answer

To check if two dictionaries are equal in C#, you can compare their key-value pairs using the `SequenceEqual` method from the `System.Linq` namespace. This allows you to determine if the dictionaries contain the same elements.

✐ Examples

1 Checking if Two Dictionaries are Equal Using `SequenceEqual`

We can check if two dictionaries are equal in C# using the `SequenceEqual` method. This example demonstrates how to declare and initialize two dictionaries, use the `SequenceEqual` method to compare them, and print whether they are equal.

For example,

We start by including the necessary namespaces: using System.Collections.Generic; and using System.Linq;.
We declare and initialize two dictionaries named firstDict and secondDict with integer keys and string values.
We use the `SequenceEqual` method to compare the dictionaries.
We print whether the dictionaries are equal.

C# Program

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

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

        Dictionary<int, string> secondDict = new Dictionary<int, string>
        {
            {1, "One"},
            {2, "Two"},
            {3, "Three"}
        };

        // Check if the dictionaries are equal using SequenceEqual
        bool areEqual = firstDict.OrderBy(kvp => kvp.Key).SequenceEqual(secondDict.OrderBy(kvp => kvp.Key));

        // Print whether the dictionaries are equal
        if (areEqual)
        {
            Console.WriteLine("The dictionaries are equal.");
        }
        else
        {
            Console.WriteLine("The dictionaries are not equal.");
        }
    }
}

Output

The dictionaries are equal.

2 Checking if Two Dictionaries are Not Equal

We can check if two dictionaries are not equal in C# using the `SequenceEqual` method. This example demonstrates how to declare and initialize two dictionaries, use the `SequenceEqual` method to compare them, and print whether they are not equal.

For example,

We start by including the necessary namespaces: using System.Collections.Generic; and using System.Linq;.
We declare and initialize two dictionaries named firstDict and secondDict with integer keys and string values.
We use the `SequenceEqual` method to compare the dictionaries.
We print whether the dictionaries are not equal.

C# Program

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

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

        Dictionary<int, string> secondDict = new Dictionary<int, string>
        {
            {1, "One"},
            {2, "Two"},
            {3, "Four"}
        };

        // Check if the dictionaries are not equal using SequenceEqual
        bool areEqual = firstDict.OrderBy(kvp => kvp.Key).SequenceEqual(secondDict.OrderBy(kvp => kvp.Key));

        // Print whether the dictionaries are not equal
        if (!areEqual)
        {
            Console.WriteLine("The dictionaries are not equal.");
        }
        else
        {
            Console.WriteLine("The dictionaries are equal.");
        }
    }
}

Output

The dictionaries are not equal.

Summary

In this tutorial, we learned How to Check if Two Dictionaries are Equal in C# language with well detailed examples.

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