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Replacing foreach loop with LINQ

, 5 Dec 2011 CPOL 41.1K 9
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Advantages of replacing a foreach loop with LINQ

In some cases LINQ can simplify iterative code, and in those cases, it's a good practice to switch iterative code into LINQ.

Regular foreach loop:
var bestStudents = new List<Student>();
foreach (var s in students)
{
    if (s.Grade > 9)
    {
        bestStudents.Add(s);
    }
}

LINQ way:
//LINQ query which generate the same result as the foreach loop above
var bestStudents = students.Where(s => s.Grade > 9).ToList();

Why does it look better with LINQ?

  1. Removing the if statement reduces the complexity (even if just a little)
  2. For me, declarative code is often more readable

Reference: LINQ Tutorial.

Click here for more LINQ examples

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Delashmate
Software Developer GE
Israel Israel
I am Software Developer at GE company for more than 2 years,

I created LINQTutorial.net since I didn't found any other good dedicate LINQ tutorial

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Comments and Discussions

 
Questionnested foreach to linq Pin
Member 1089911622-Jun-14 1:33
memberMember 1089911622-Jun-14 1:33 
GeneralMy vote of 3 Pin
pushkar723-Sep-13 1:12
memberpushkar723-Sep-13 1:12 
GeneralRe: Ok, thanks for your comments :) By the way in case there is... Pin
Dan De'lashmate9-Nov-11 2:41
memberDan De'lashmate9-Nov-11 2:41 
GeneralRe: Well... in that case I agree and disagree. LINQ will be bett... Pin
Paulo Zemek9-Nov-11 2:26
mvpPaulo Zemek9-Nov-11 2:26 
Well... in that case I agree and disagree. LINQ will be better... but by the fact you don't need to create a new list. Creating one... well... I can say that the best option is to iterate the reverse way and delete the invalid items to save memory.
GeneralReason for my vote of 1 Horrible idea. The Linq way is MUCH ... Pin
SledgeHammer016-Dec-11 4:47
memberSledgeHammer016-Dec-11 4:47 
GeneralRe: Who said we have performance problem?! PREMATURE OPTIMIZATI... Pin
Delashmate7-Dec-11 1:20
memberDelashmate7-Dec-11 1:20 
GeneralReason for my vote of 3 To me it is a matter of style. In th... Pin
Oshtri Deka10-Nov-11 12:33
memberOshtri Deka10-Nov-11 12:33 
GeneralReason for my vote of 2 I already posted... but the reason i... Pin
Paulo Zemek9-Nov-11 1:45
mvpPaulo Zemek9-Nov-11 1:45 
GeneralWell... you may replace the <code>if</code> with linq... but... Pin
Paulo Zemek9-Nov-11 1:44
mvpPaulo Zemek9-Nov-11 1:44 
GeneralRe: Who said I need to iterate through the "bestStudents" in the... Pin
Dan De'lashmate9-Nov-11 2:17
memberDan De'lashmate9-Nov-11 2:17 
GeneralRe: http://msdn.microsoft.com/en-us/library/bwabdf9z.aspx Pin
stooboo12-Dec-11 13:40
memberstooboo12-Dec-11 13:40 
GeneralRe: http://msdn.microsoft.com/en-us/library/bwabdf9z.aspx Pin
LittleGreenMartian14-May-13 20:01
memberLittleGreenMartian14-May-13 20:01 
GeneralThe second point Riz makes is no biggie. You can still write... Pin
tdmeers24-Oct-11 15:46
membertdmeers24-Oct-11 15:46 
GeneralIn case some don't know, the result will not be 100% the sam... Pin
Riz Thon24-Oct-11 14:47
memberRiz Thon24-Oct-11 14:47 
GeneralReason for my vote of 5 I Liked it! Pin
onkuda0724-Oct-11 12:28
memberonkuda0724-Oct-11 12:28 
GeneralReason for my vote of 2 a silly idea. Pin
rj4524-Oct-11 11:27
memberrj4524-Oct-11 11:27 
GeneralRe: For me it's beautiful, I Hope the silent majority see that t... Pin
Dan De'lashmate24-Oct-11 11:35
memberDan De'lashmate24-Oct-11 11:35 
GeneralReason for my vote of 1 You say advantageS of replacing a fo... Pin
drkaj24-Oct-11 8:36
memberdrkaj24-Oct-11 8:36 
GeneralRe: I will try do better next time :) Pin
Dan De'lashmate24-Oct-11 10:09
memberDan De'lashmate24-Oct-11 10:09 

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