Which is faster linq or foreach

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Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question. Let's work to help developers, not make them feel stupid. Related Questions. How do I convert the below foreach loop to a linq statement.

Problem with foreach loop PHP. Faster version of setpixel. Groupby linq has a problem with my xpath. I get multiple records from database using linq and I'm using foreach loop to get each record and added it to a list. Performance wise take a look at this blog post.

As has been said, the for loop will most likely be more performant, but you can still clean the code up a bit more:. EDIT: As per the performance question. I found that the foreach version performs a few milliseconds better than the for loop.

EDIT2 - Regarding the link that seems to indicate such drastically poor performance in a foreach loop. In the case that you have a generic list, removing elements via a for loop is not normally the best approach. A better approach is to use the RemoveAll method. RemoveAll will remove all elements matching the predicate and then consolidate the list as opposed to RemoveAt which will require moving all elements above the removed element. For performance comparison of the removal please see the below code once again, this can be run in LINQPad.

In my testing the RemoveAll ran roughly x faster. I don't think it will run faster on LINQ. The function cylindre. IsPointInside would still have to be called on each item of Vertices.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Is the LINQ version faster than the foreach one? Ask Question. That should be enough reason. Tags: C Performance Linq Foreach. Shortest Hello World program with no semi colons Update. Pandas how to find column contains a certain value Recommended way to install multiple Python versions on Ubuntu Some like to write blogs, I am more of a 'get my hands dirty' kind of guy The proper question here is not why foreach is slower than LINQ but rather why foreach is slower than for.

In the case of arrays foreach and for should generate similar code and thus similar timings. If the timings are so different then there's a good chance that the 2 versions aren't comparable.

After fixing it, the for loop version is as slow as the foreach version:. If you change it to use the other overload then it will probably be slow as well. You may need to use a custom comparer to actually not being able to devirtualize and be as slow as those 2. My guess is that it has something to do with the fact that LINQ uses less lines of code, so the compiler is able to process the request faster.

Skip to content. Star 7. New issue. Jump to bottom. Why is a foreach loop on an array slower than a LINQ call? Labels question. Linked pull requests. Copy link. All SupersetArray.