CODEWITHSUNDEEP
c#dictionary
Left4Cookies
Left4Cookies

Reputation: 597

Grouping an array by type in a Dictionary

Say I have this array of objects:

        var input = new object[]
        { 
            "Hello",
            123,                
            true,
            "Hats",
            12,34,
            '!'
        };

Which I then want to group by types and then return a dictionary with the type as the key and the number of occurrences of each type as the value. How would I go about doing this? I've got the array into a dictionary now, but from here I'm a little stuck as to what to do with it.

Upvotes: 0

Views: 218

Answers (1)

Selman Genç
Selman Genç

Reputation: 101701

Simply group by Type, and use ToDictionary method:

input.GroupBy(x => x.GetType()).ToDictionary(x => x.Key, x => x.Count());

Usually, when you are using GroupBy to group based on a reference type you need either override Equals and GetHashCode method on the type, or implement a custom comparer to get the expected behaviour. But fortunutely, the Type class is already doing that. So this will work as expected.

Upvotes: 5

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