.net - IF/ELSE 语句顺序的最佳实践

Question

哪个是更好的做法？ (如果这有所作为，我正在 .Net 中编码)

IF condition = true THEN
   ...true action--even if rare...
ELSE
   ...action
END IF

或者

IF condition = [most common condition] THEN
   ...most common action....
ELSE
   ...least common action
END IF

Answer 1

根据 Code Complete 的作者 Steve McConnell 的说法，你应该

"Put the case you normally expect to process first. This is in line with the general principle of putting code that results from a decision as close as possible to the decision...[putting the normal case after the if] puts the focus on reading the main flow rather than on wading through the exceptional cases, so the code is easier to read overall."

Code Complete ，第 2 版，第 356-357 页。