What's the performance consequence using the 'With' keyword in vb.net instead of using reusing the instance name over and over?
+1
A:
There is no runtime performance cost. It is just "syntactic sugar" to make your code look prettier.
Eilon
2010-01-13 00:51:01
+1
A:
Assuming that you're comparing it to a local variable reference, there is no difference whatsoever; both will emit the exact same IL. (At least in Release mode)
However, if you're comparing it to repeated invocations of a property or indexer, With will be a little bit faster, and if you're comparing it to repeated invocations of a method, it might be much faster. (The With keyword will create a local variable and assign it to the object that you With'd, so the method will only be called once instead of on every line)
SLaks
2010-01-13 00:52:42
+1. Although I'd say you should only worry about these performance differences if you've measured and found a serious performance bottleneck in a specific block of code that uses With. "Premature micro-optimization is the root of all evil"
MarkJ
2010-01-13 13:21:07