Extension Methods: Performance issue when using too much?

Question

Possible Duplicate:
Extension Method Performance

Will I face performance issues when I´m using extension methods too heavy in any way?

Just an example:

Lets say I´ve 100 extension methods on the type string and a business object that has 50 string properties. Now I create a collection of this business object, maybe 500 items?

Do these extension methods on string have any impact to RAM, CPU, ...?!

I really like extension methods but I´d like to know if there is a limitation concerning its usage.

score 16 · Accepted Answer · answered Feb 09 '12 at 10:32

16

No you will not.

Extension methods are just normal static methods with some syntactic sugar. Use them as much as you want :)

answered Feb 09 '12 at 10:32

Alexey Raga

7,457
1
31
40

I'm writing an extension library so this is nice to know – DerpyNerd Aug 13 '16 at 11:51

score 5 · Answer 2 · answered Feb 09 '12 at 10:34

5

You might slow intellisense down in the IDE - and possibly make the intellisense lists a bit unwieldy, but it won't have any impact on the execution of the code itself over any other static method.

answered Feb 09 '12 at 10:34

Rob Levine

40,328
13
85
111

score 3 · Answer 3 · answered Feb 09 '12 at 10:34

An extension method is part of a static class, and it's a syntactic sugar because simulates that some static method is an instance method of some other class.

In conclusion, there's no performance penalty here. It's the same ExtensionMethods.YourExtensionMethod(objectToAddMethod) and objectToAddMethod.YourExtensionMethod().

score 0 · Answer 4 · edited May 23 '17 at 12:32

0

I think this is a duplicate:

See: Is there a performance hit for creating Extension methods that operate off the object type?

The answer there explains this very well!

edited May 23 '17 at 12:32

Community

1
1

answered Feb 09 '12 at 10:35

Digvijay

361
1
9

3

If you think this is a duplicate, you need to comment out OP question instead of adding an useless answer ;) – Matías Fidemraizer Feb 09 '12 at 10:35
how do i do that? I have just actively started to use StackOverflow so any tips would be nice. – Digvijay Feb 09 '12 at 10:42
@Digvijay Click `close` at the question. You need **[3000 reputation](http://stackoverflow.com/privileges/close-questions)** though – sehe Feb 09 '12 at 10:47
@Digvijay I mean adding a comment to the question. sehe is right, but you can suggest anything with regular comments too. – Matías Fidemraizer Feb 09 '12 at 10:52
@Matías I do not have enough privileges to comment anywhere yet!!! else i shall do so. – Digvijay Feb 09 '12 at 11:04
@Digvijay Oh, I didn't know that, I thought this was available for all. – Matías Fidemraizer Feb 09 '12 at 11:28
The questions are similar but the context is at some extent different, I think they deserve their place as two separated questions – Andre Nov 23 '22 at 12:29

Extension Methods: Performance issue when using too much?

4 Answers4