1.在.net4.0中,有了一个新的类库:任务并行库。它极大地简化了并行编程且内容丰富。这里仅介绍其中最简单的
Parallel.For循环和Parallel.ForEach循环。它们位于System.Threading.Tasks命名空间。它们是两个方法,这两个方法将迭代分别放在不同的处理器上并行处理,如果机器是多处理器或多核处理器,这样就会使性能大大提升。
2.例子用Parallel.For做计算,为数组赋值并打印,用Parallel.ForEach计算字符串数组每个元素的长度,运行结果:
3.代码:
- using System;
- using System.Threading.Tasks; //必须使用这个命名空间
- namespace 为多核处理器而生的多线程方法Parallel.For和Parallel.ForEach
- {
- class Program
- {
- static void Main(string[] args)
- {
- Parallel.For(0,5,i=>Console.WriteLine("The square of {0} is {1}", i , i*i));
- Console.WriteLine();
- const int maxValues = 5;
- int[] squares=new int[maxValues];
- Parallel.For(0, maxValues,i=>Console.WriteLine(i*i));
- Console.WriteLine();
- string[] squarsStr = new string[]{
- "We","are","the","kings","of","this",
- "beautiful","world","How","do","you","think"
- };
- Parallel.ForEach(squarsStr,
- i => Console.WriteLine(string.Format("{0} has {1} letters",i,i.Length)));
- Console.WriteLine();
- }
- }
- }