Demo: For and Foreach in Intermediate Language
The lesson disassembles the benchmark DLL to confirm that for on a list calls List.GetItem, foreach on a list calls GetEnumerator and MoveNext, and both for and foreach on a 1D array produce identical ldelm-based loop code. We demonstrate exactly why the enumerator path is slower: every iteration requires a virtual method call to advance to the next element.
Previous Module
Basic Performance Optimizations
This Module
Array Performance Optimizations
1D, 2D and Jagged Arrays
1D Arrays in Intermediate Language
2D Arrays in Intermediate Language
Jagged Arrays in Intermediate Language
Demo: Benchmarking Arrays (part 1)
Demo: Benchmarking Arrays (part 2)
Array Performance Recap
For versus Foreach Performance
Foreach on an Array
Demo: Benchmarking For and Foreach
Demo: For and Foreach in Intermediate Language