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LINQ query to get element with highest score

Posted on 2013-11-05
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Last Modified: 2016-02-10
I'm trying to get an object in a list of objects that has the highest score. If there are two or more objects with equal high scores, I can get the first, either, or any.
Is the code below the best way to do it, or is there a better way?

 List<AddressCandidate> returnedCandidates = args.Results;

// Get the AddressCandidate with the highest addressCandidate score.
AddressCandidate addCand =   (
                from address in returnedCandidates
                let high = returnedCandidates.Max(highest => highest.Score)
                where address.Score == high
                select address).First();

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Question by:XTO
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LVL 23

Expert Comment

by:Jens Fiederer
ID: 39624568
I prefer using the order by clause....probably more efficient, too.
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Author Comment

by:XTO
ID: 39624574
I should add this.
I'm thinking that the above can't be the most efficient way.

Here's why:

Suppose that returnedCandidates has a count of 8 objects.
As I step through the code in debug mode, the debugger goes through all 8 objects in step 4 above.
Then the debugger goes to step 5, and then returns back to step 4 for 8 more loops.
In other words, the debugger hits step 5 a total of 8 times, which means that step 4 gets looped 64 times total.
That seems slower than if I had just done a for loop and captured an object with the highest score.
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LVL 23

Accepted Solution

by:
Jens Fiederer earned 250 total points
ID: 39624579
I.e. something like

(from address in returnedCandidates
                orderby address.Score
                select address).First();
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LVL 23

Expert Comment

by:Jens Fiederer
ID: 39624583
(or, actually, LAST)
0
 

Author Comment

by:XTO
ID: 39624586
re: jensfiederer,

I'm going to try to create an example using an order by clause and post it here.
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Author Comment

by:XTO
ID: 39624594
Our posts crossed.
0
 

Author Comment

by:XTO
ID: 39624654
re: jensfiederer

I tried your way and it worked correctly.

List<AddressCandidate> returnedCandidates = args.Results;
AddressCandidate addCand = (
                from address in returnedCandidates
                orderby address.Score
                select address).Last();  


Thank you.
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LVL 23

Expert Comment

by:Jens Fiederer
ID: 39624664
My pleasure
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