How do I compare collections in C#?

How do I compare two lists in C# to find common elements?

You can use LINQ to compare two lists. For example, you can use the Intersect method to find common elements.

Can you show me a code example of that?

Sure! Here's a simple example:

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

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3, 4, 5 };
        List<int> list2 = new List<int> { 4, 5, 6, 7, 8 };
        var commonElements = list1.Intersect(list2);
        Console.WriteLine("Common elements: " + string.Join(", ", commonElements));
    }
}

What if I want to compare two dictionaries instead?

You can compare dictionaries by checking for matching keys and values. You can use LINQ's Where method for that.

Can you provide a code snippet for comparing dictionaries?

Absolutely! Here's an example:

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

class Program
{
    static void Main()
    {
        Dictionary<string, int> dict1 = new Dictionary<string, int> { { "a", 1 }, { "b", 2 } };
        Dictionary<string, int> dict2 = new Dictionary<string, int> { { "b", 2 }, { "c", 3 } };
        var commonEntries = dict1.Where(d => dict2.ContainsKey(d.Key) && dict2[d.Key] == d.Value);
        foreach (var entry in commonEntries)
        {
            Console.WriteLine($"Key: {entry.Key}, Value: {entry.Value}");
        }
    }
}