This is lesson 12 of 12 in this module
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For outperforms Foreach
The lesson summarizes when each construct is the right choice: use foreach only when you genuinely need the enumerator's ability to traverse large, dynamic, or memory-unfriendly data structures such as LINQ queries or infinite sequences; use for with an indexer for all in-memory collections where performance matters. We note that LINQ is entirely built on enumerators and therefore carries the same performance trade-off.
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