CODEWITHSUNDEEP
c#listlinqaverage
nojohnny101
nojohnny101

Reputation: 572

average of first 3 items from list using linq

I have cobbled together what I thought would have been a solution to what I wanted to do based on other threads on here on this topic (return a specific number of items from a list) but I think my syntax is a little of and it is not allowing me to sum the items I have taken.

Here is what I have:

public decimal average_of_items_examples(List<Car> cars)
        {
            if (cars == null)
            {
                return 0;
            }
            else if (cars.Count == 0)
            {
                return 0;
            }
            else
            {
                return cars.OrderBy(x => x.SuggestedRetailPrice).Take(3).Average();
            }
        }

I appreciate any help and appreciate explanations.

EDIT: Sorry I forgot to add why I have the OrderBy part. I only want the average of the 3 less expensive cars.

NOTE: I can not change the type "decimal" as this is how the exercise was written.

Upvotes: 1

Views: 924

Answers (2)

mjwills
mjwills

Reputation: 23975

Both:

cars.OrderBy(x => x.SuggestedRetailPrice).Take(3).Select(z => z.SuggestedRetailPrice).Average();

and:

cars.Select(z => z.SuggestedRetailPrice).OrderBy(x => x).Take(3).Average();

will do what you need.

They are both basically the same.

Upvotes: 3

AD.Net
AD.Net

Reputation: 13399

.Average(x => x.SuggestedRetailPrice)

You have to specify the property you want to get average of since the collection is for Car objects

Upvotes: 3

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