Foreach on an Array
We reveal that the C# compiler silently rewrites foreach on a one-dimensional array into an equivalent for loop, so there is no performance difference between the two constructs for arrays. The lesson explains that this optimization only applies to 1D arrays; foreach on a List still generates a full enumerator. We use the compiled intermediate language code to prove both cases.
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