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Replacing foreach loop with LINQ

, 5 Dec 2011 CPOL
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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

Comments and Discussions

 
GeneralIn case some don't know, the result will not be 100% the sam... PinmemberRiz Thon24-Oct-11 15:47 
In case some don't know, the result will not be 100% the same:
- in the 1st case you end up with a List<Student> which is created at once
- in the 2nd case you end up with a IEnumerable<Student> which will be evaluated once you iterate it.
As for me I don't like the SQL way of writing, I prefer students.Where(...).
Also if you do students.Where(s => s.Grade > 9).ToList() you'll end up with exactly the same as in the 1st case.

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