C#【多线程篇】Parallel.For和for的效率比较（Paralle.Foreach和foreach比较类似）

本文主要是介绍C#【多线程篇】Parallel.For和for的效率比较（Paralle.Foreach和foreach比较类似），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、执行耗时任务（Parallel.For更快，多线程执行）

using System;
using System.Threading.Tasks;          // Must use this namespace
using System.Diagnostics;
using System.Threading;namespace ExampleParallelFor
{class Program{static void Main(){const int maxValues = 100;//forint[] squares = new int[maxValues];Stopwatch sw = new Stopwatch();sw.Start();for (int i = 0; i < maxValues; i++){squares[i] = i * i;Thread.Sleep(10);}Console.WriteLine("for time:{0}", sw.ElapsedMilliseconds.ToString());//Parallel.Forint[] squares1 = new int[maxValues];Stopwatch sw1= new Stopwatch();sw1.Start();         Parallel.For(0, maxValues, i => { squares[i] = i * i; Thread.Sleep(10); });Console.WriteLine("Paralle.For time:{0}", sw1.ElapsedMilliseconds.ToString());//for (int i = 0; i < maxValues; i++)//{ Console.WriteLine("Element {0}: {1}", i, squares[i]); }Console.ReadLine();}}
}

执行结果：

2、执行短小（时间短、耗时小）任务（for更快，单线程执行）

using System;
using System.Threading.Tasks;          // Must use this namespace
using System.Diagnostics;
using System.Threading;namespace ExampleParallelFor
{class Program{static void Main(){const int maxValues = 100;//forint[] squares = new int[maxValues];Stopwatch sw = new Stopwatch();sw.Start();for (int i = 0; i < maxValues; i++){squares[i] = i * i;//Thread.Sleep(10);}Console.WriteLine("for time:{0}", sw.ElapsedMilliseconds.ToString());//Parallel.Forint[] squares1 = new int[maxValues];Stopwatch sw1= new Stopwatch();sw1.Start();         Parallel.For(0, maxValues, i => { squares[i] = i * i;/* Thread.Sleep(10);*/ });Console.WriteLine("Paralle.For time:{0}", sw1.ElapsedMilliseconds.ToString());//for (int i = 0; i < maxValues; i++)//{ Console.WriteLine("Element {0}: {1}", i, squares[i]); }Console.ReadLine();}}
}

执行结果：