关注性能：字符串操作

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 1 using system;
 2 using system.collections.generic;
 3 using system.linq;
 4 using system.text;
 5 using system.threading;
 6 using system.diagnostics;
 7
 8 namespace csharpstudy
 9 {
10     class program
11     {
12         static void main(string[] args)
13         {
14             helper.watch(() =>
15             {
16                 var str = new stringbuilder();
17                 for (var i = 0; i < 100000; i++)
18                 {
19                     str.append(i);
20                 }
21             });
22             helper.watch(() =>
23             {
24                 var str = "";
25                 for (var i = 0; i < 100000; i++)
26                 {
27                     str += i;
28                 }
29             });
30             helper.watch(() =>
31             {
32                 var str = "";
33                 for (var i = 0; i < 100000; i++)
34                 {
35                     str += i.tostring();
36                 }
37             });
38         }
39     }
40

 

摘自 学海无涯