Parallel Power并行的力量（一个测试代码）

Parallel

1. using System;
2. using System.Collections.Generic;
3. using System.Diagnostics;
4. using System.Linq;
5. using System.Text;
6. using System.Threading;
7.  
8. namespace ConsoleApplication2
9. {
10.     class Test
11.     {
12.         static void Main()
13.         {
14.             int max = 500;
15.             var query = Enumerable.Range(0, max)
16.                                   .Select(SlowProjection)
17.                                   .Where(x => x > 10)
18.                                   .AsParallel();
19.             Stopwatch sw = Stopwatch.StartNew();
20.             int count = query.Count();
21.             sw.Stop();
22.             Console.WriteLine("Count: {0} in {1}ms", count,
23.                               sw.ElapsedMilliseconds);
24.  
25.             query = Enumerable.Range(0, max)
26.                               .AsParallel()
27.                               .Select(SlowProjection)
28.                               .Where(x => x > 10);
29.             sw = Stopwatch.StartNew();
30.             count = query.Count();
31.             sw.Stop();
32.             Console.WriteLine("Count: {0} in {1}ms", count,
33.                               sw.ElapsedMilliseconds);
34.             Console.Read();
35.         }
36.  
37.         static int SlowProjection(int input)
38.         {
39.             Thread.Sleep(100);
40.             return input;
41.         }
42.     }
43.  
44. }

这里比较了两种使用并行效率的比较,没有写顺序执行的原因你懂的.