How can I merge two dictionaries in C#?

How can I merge two dictionaries in C#?

You can merge two dictionaries in C# using the Concat method or by using a loop to add entries from one dictionary to another.

Can you show me an example using the Concat method?

Sure! Here's an example:

var dict1 = new Dictionary<int, string>{{1, "One"}, {2, "Two"}};
var dict2 = new Dictionary<int, string>{{2, "Deux"}, {3, "Three"}};

var merged = dict1.Concat(dict2)
                  .GroupBy(x => x.Key)
                  .ToDictionary(g => g.Key, g => g.Last());

What if there are duplicate keys?

In the example above, the GroupBy method is used to handle duplicate keys by keeping the last value. You can modify this behavior as needed.

Is there a way to merge dictionaries without LINQ?

Yes! You can use a simple loop to merge dictionaries without LINQ. Here's an example:

foreach (var kvp in dict2)
{
    dict1[kvp.Key] = kvp.Value;
}