Howto: C # Performance Test extended functions

ReadArticleIt reminds me of this. It may not have much practical significance, but it is indeed a good idea.
We usually use stopwatch for time statistics in this way.

 
Stopwatch watch = stopwatch. startnew (); For (INT I = 0; I <runs; I ++) {......} watch. Stop ();
 

In this way, the running time can be counted, but anyone who has used Python knows that python has its own battery. In fact, using an extension function can achieve this similar function (PS: in fact, the function is quite different, but the skin has already drawn a lot like it ).
First, demonstrate how to use IT (count the usage time of the method A. Run for 100 times)

 
Class program {static void main (string [] ARGs) {A = new A (); Action Act =. run; console. writeline (Act. profile (100); console. read () ;}} public class A {public void run () {for (INT I = 0; I <100000; I ++ );}}}
 

Use the extension method to implement this requirement, so you do not need to write stopwatch repeatedly.

Public static class functionhelper {public static string profile (this action func, int runs) {stopwatch watch = stopwatch. startnew (); For (INT I = 0; I <runs; I ++) {func ();} watch. stop (); float sec = watch. elapsedmilliseconds/1000.0f; float freq = runs/sec; return string. format ("execute runs: {0}; sec: {1}; freq", runs, // times of Operation sec, // run time freq // Average Run Time );}}
 

With this extension method, you can automatically call performance functions for certain methods.