C# 并行线程调用

参考

一、异步委托开启线程

  Action<int, int> a = add;
            a.BeginInvoke(3, 4, null, null);//前两个是add方法的参数，后两个可以为空
            Console.WriteLine("main()");
            Console.ReadKey();


  static void add(int a, int b)
        {
            Console.WriteLine(a + b);
        }

如果不是开启线程，像平常一样调用的话，应该先输出7，再输出main（）

二、通过thread类开启线程

            new Thread(() =>
            {
                DTTEST();
            })
            { IsBackground = true }.Start();
            new Thread(() =>
            {
                DTTEST();
            })
            { IsBackground = true }.Start();
            new Thread(() =>
            {
                DTTEST();
            })
            { IsBackground = true }.Start();

            Thread.Sleep(10000);


        static private void DTTEST()
        {

            Console.WriteLine($"测试并行调用{DateTime.Now}");
        }

或者

            Thread thread = new Thread(() =>
            {
                while (true)
                {
                    Thread.Sleep(1000);
                    DTTEST();
                }
            });
            thread.Start();

三、通过线程池开启线程

            var param = "哈哈";
            ThreadPool.QueueUserWorkItem(obj =>
            {
                    // DTTEST(param);
                    CallbackDemoViod(obj);
            }, param);
            ThreadPool.QueueUserWorkItem((o) =>
            {
                DTTEST(param);
            });

       private static void CallbackDemoViod(object obj)
        {
            //以下不catch异常就会导致闪退
            try
            {
                Console.WriteLine(obj.ToString());
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex);
            }
          
        }
        static private void DTTEST(string a)
        {
            try
            {
                Console.WriteLine(a);
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex);
            }
        }

或者

            var param = "哈哈";
            ThreadPool.QueueUserWorkItem(CallbackDemoViod, param);//这种写法方法体参数必须为object

        private static void CallbackDemoViod(object obj)
        {
            //以下不catch异常就会导致闪退
            try
            {
                Console.WriteLine(obj.ToString());
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex);
            }
          
        }

或者

            var param = "哈哈";
            WaitHandle[] waitHandles = new WaitHandle[]
        {
                new AutoResetEvent(false),
                new AutoResetEvent(false),
                new AutoResetEvent(false)
        };

            ThreadPool.QueueUserWorkItem((o) =>
            {
                DTTEST(param);
                ((AutoResetEvent)o).Set();
            }, waitHandles[0]);
            ThreadPool.QueueUserWorkItem((o) =>
            {
                DTTEST(param);
                ((AutoResetEvent)o).Set();
            }, waitHandles[1]);
            ThreadPool.QueueUserWorkItem((o) =>
            {
                DTTEST(param);
                ((AutoResetEvent)o).Set();
            }, waitHandles[2]);
            WaitHandle.WaitAll(waitHandles);


 static private void DTTEST(string a)
        {
            try
            {
                Console.WriteLine(a);
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex);
            }
        }

4、通过任务开启线程

4.1通过Task

             Task wt1 = Task.Run(() =>
            {
                DTTEST();
            });
            Task wt2 = Task.Run(() =>
            {
                DTTEST();
            });
            Task wt3 = Task.Run(() =>
            {
                DTTEST();
            });
            var wtasks = new Task[] { wt1, wt2, wt3 };
            Task.WaitAll(wtasks);

         static private void DTTEST()
        {

            Console.WriteLine($"测试并行调用{DateTime.Now}");
        }

4.2 Task.Factory.StartNew

            int val = 5;

            Task.Factory.StartNew(() =>
            {
                MessageBox.Show("测试StartNew：无参数");
            });

            Task.Factory.StartNew(a =>
            {
                MessageBox.Show("测试StartNew：参数值" + (int)a);
            }, val);

5、Invoke实现

                  Parallel.Invoke(
                  () =>
                  {
                      DTTEST();
                  },
                   () =>
                   {
                       DTTEST();
                   },
                  () =>
                  {
                      DTTEST();
                  },
                  () =>
                  {
                      DTTEST();
                  },
                  () =>
                  {
                      DTTEST();
                  }
           );

 参考