foreach與for的性能比較

  1 string[] strings = new string[] { "str1", "str2", "str3", "str4", "str5", "str6" }; 2             foreach (string s in strings) 3             { 4                 textBox1.AppendText(s + " "); 5             }

IL：

01             foreach (string s in strings) 02 000000e0  nop  03 000000e1  mov         eax,dword ptr [ebp-44h]  04 000000e4  mov         dword ptr [ebp-50h],eax  05 000000e7  xor         edx,edx  06 000000e9  mov         dword ptr [ebp-54h],edx  07 000000ec  nop  08 000000ed  jmp         00000136                       //jmp to J1 09 000000ef  mov         eax,dword ptr [ebp-54h]  10 000000f2  mov         edx,dword ptr [ebp-50h]  11 000000f5  cmp         eax,dword ptr [edx+4]  12 000000f8  jb          000000FF 　　　　　　　　//低於"1個字節全是1"跳轉  13 000000fa  call        65C86690 　　　　　　　　//地址如此之大,應該是個外部call 14 000000ff  mov         eax,dword ptr [edx+eax*4+0Ch]  15 00000103  mov         dword ptr [ebp-48h],eax  16             { 17 00000106  nop  18                 textBox1.AppendText(s + " ");