In .NET, which loop runs faster, ‘for’ or ‘foreach’?

by

Patrick Smacchia blogged about this last month, with the following conclusions:

  • for loops on List are a bit more than 2 times cheaper than foreach
    loops on List.
  • Looping on array is around 2 times cheaper than looping on List.
  • As a consequence, looping on array using for is 5 times cheaper
    than looping on List using foreach
    (which I believe, is what we all do).

More Related Contents:

  1. Best way to reverse a string
  2. How to create a new object instance from a Type
  3. What’s the fastest way to read a text file line-by-line?
  4. Is DateTime.Now the best way to measure a function’s performance? [closed]
  5. String vs. StringBuilder
  6. How slow are .NET exceptions?
  7. How costly is .NET reflection?
  8. Performance differences between debug and release builds
  9. C# Sort and OrderBy comparison
  10. How to get object size in memory? [duplicate]
  11. Does C# optimize the concatenation of string literals?
  12. LINQ: Not Any vs All Don’t
  13. Exact time measurement for performance testing [duplicate]
  14. String interning in .Net Framework – What are the benefits and when to use interning
  15. Float vs Double Performance
  16. Why is LINQ .Where(predicate).First() faster than .First(predicate)?
  17. Performance of “direct” virtual call vs. interface call in C#
  18. SQLite .NET performance, how to speed up things?
  19. How does extern work in C#?
  20. How performant is StackFrame?
  21. How to force a number to be in a range in C#? [duplicate]
  22. How accurate is System.Diagnostics.Stopwatch?
  23. Warm-up when calling methods in C#
  24. Why is processing a sorted array slower than an unsorted array?
  25. XmlSerializer Performance Issue when Specifying XmlRootAttribute
  26. When to use pointers in C#/.NET?
  27. When to change the Generate Serialization Assembly value?
  28. Slow SoapHttpClientProtocol constructor
  29. Fastest implementation of log2(int) and log2(float)
  30. Why subsequent direct method call is much faster than the first call?

Leave a Comment