C# Parallel 多线程并发

Parallel并发执行多个任务 多线程的，主线程会参与计算---阻塞界面等于TaskWaitAll+主线程计算

常用方法

1、Invoke  尽可能并行执行提供的每个操作

            Console.WriteLine("***************Parallel.Invoke Start******************");
            Parallel.Invoke(
                () => Console.WriteLine("action0"),
                () => Console.WriteLine("action1"),
                () => Console.WriteLine("action2"),
                () => Console.WriteLine("action3"),
                () => Console.WriteLine("action4"),
                () => Console.WriteLine("action5"),
                () => Console.WriteLine("action6"));
            Console.WriteLine("***************Parallel.Invoke End******************");
            Console.WriteLine();

2、For  并行运行迭代，可以配置循环选项，可以监视和操作循环的状态

            Console.WriteLine("***************Parallel.For Start******************");
            Parallel.For(0, 5, i => Console.WriteLine($"Parallel.For{i}"));
            Parallel.For(0, 5, (i,p) => Console.WriteLine($"Parallel.For{i} {p.IsExceptional}"));
            Console.WriteLine("***************Parallel.For End******************");
            Console.WriteLine();

3、Foreach 并行运行迭代，可以配置循环选项，可以监视和操作循环的状态

            var array = new[] { "A", "B", "C", "D", "E" };
            Console.WriteLine("***************Parallel.ForEach Start******************");
            Parallel.ForEach(array, s => Console.WriteLine(s));
            Console.WriteLine("***************Parallel.ForEach End******************");
            Console.WriteLine();

 

有没有办法不阻塞主线程？结合Task

                Task.Run(() =>
                {
                    ParallelOptions options = new ParallelOptions();
                    options.MaxDegreeOfParallelism = 3;
                    Parallel.For(0, 10, options, s => Console.WriteLine(s));
                });

微软文档：

Parallel：https://docs.microsoft.com/zh-cn/dotnet/api/system.threading.tasks.parallel?view=netframework-4.8

ParallelOptions：https://docs.microsoft.com/zh-cn/dotnet/api/system.threading.tasks.paralleloptions?view=netframework-4.8