1 class Program
 2     {
 3         private const int N = 10000000;
 4         private static Stopwatch watch = new Stopwatch();
 5         static void Main(string[] args)
 6         {
 7 
 8             string source = "aaabbbcccdddeeefffggghhhiiijjjkkklllmmmnnnooopppqqq";
 9             string target = "
 
AAA";
10             Console.WriteLine("目標在開頭部分時：");
11             Console.WriteLine("不區分大小寫：");
12             TestContains(source, target,true);
13             TestIndexOf(source, target,true);
14             Console.WriteLine("區分大小寫：");
15             target = "aaa";
16             TestContains(source, target,false
 
);
17             TestIndexOf(source, target,false);
18             Console.WriteLine();
19 
20             Console.WriteLine("目標在中部時：");
21             Console.WriteLine("不區分大小寫：");
22             target = "HHH";
23             TestContains(source, target, true);
24             TestIndexOf(source, target, true
 
);
25             Console.WriteLine("區分大小寫：");
26             target = "hhh";
27             TestContains(source, target, false);
28             TestIndexOf(source, target, false);
29             Console.WriteLine();
30 
31             Console.WriteLine("目標在結尾時：");
32             Console.WriteLine("不區分大小寫：");
33             target = "QQQ";
34             TestContains(source, target,true);
35             TestIndexOf(source, target,true);
36             Console.WriteLine("區分大小寫：");
37             target = "qqq";
38             TestContains(source, target,false);
39             TestIndexOf(source, target,false);
40 
41             Console.WriteLine("執行完畢，按任意鍵退出...");
42             Console.ReadKey();
43 
44         }
45         private static void TestIndexOf(string source, string target,bool isIgnoreCase)
46         {
47             watch.Reset();
48             watch.Start();
49             for (int i = 0; i < N; i++)
50             {
51                 if (isIgnoreCase)
52                     source.IndexOf(target, StringComparison.OrdinalIgnoreCase);
53                 else
54                     source.IndexOf(target);
55             }
56             watch.Stop();
57             Console.WriteLine("IndexOf: " + watch.ElapsedMilliseconds.ToString() + "ms");
58             return;
59         }
60 
61         private static void TestContains(string source, string target,bool isIgnoreCase)
62         {
63             watch.Reset();
64             watch.Start();
65             for (int i = 0; i < N; i++)
66             {
67                 if (isIgnoreCase)
68                     source.ToLower().Contains(target.ToLower());
69                 else
70                     source.Contains(target);
71             }
72             watch.Stop();
73             Console.WriteLine("Contains: " + watch.ElapsedMilliseconds.ToString() + "ms");
74             return;
75         }
76     }