异步多线程（Thread）

Thread

1.利用Thread开启异步线程：

ThreadStart threadStart = new ThreadStart(() => this.DoSomethingLong("btnThreads_Click"));
Thread thread = new Thread(threadStart);
thread.Start();

2.设置前台前程与后台线程：

thread.IsBackground = true;

默认是前台线程，也就是当UI线程退出后，整个进程并不会结束，知道所有的的计算线程执行完，才退出，反之，后台进程是当UI线程退出后，进程立即退出，不会再进行计算

3.线程等待：

thread.Join();

把当前线程join到主线程，主线程等待当前线程执行完

4.基于Thread封装支持回调：

  private void ThreadWithCallback(ThreadStart threadStart, Action callback)
        {
            ThreadStart threadNew = new ThreadStart(
                ()=>
                {
                    threadStart.Invoke();
                    callback();
                });
            Thread thread = new Thread(threadNew);
            thread.Start();
        }

测试回调：

  ThreadStart threadStart = new ThreadStart(() => {
                this.DoSomethingLong("btnThreads_Click");

               });
               this.ThreadWithCallback(threadStart, () => { Console.WriteLine($"这里是回调{Thread.CurrentThread.ManagedThreadId.ToString("00")}"); });

5.基于Thread封装带返回值：

  private Func ThreadWithReturn(Func funcT)
        {
            T t = default(T);
            ThreadStart startNew = new ThreadStart(
                () =>
                {
                    t = funcT.Invoke();
                });
            Thread thread = new Thread(startNew);
            thread.Start();

            return new Func(() =>
            {
                thread.Join();
                return t;
            });
        }

测试返回值：

  Func func = this.ThreadWithReturn(()=>
                {
                    Thread.Sleep(2000);
                    Console.WriteLine($"这里是ThreadStart {Thread.CurrentThread.ManagedThreadId.ToString("00")}");
                    return 12345;
                });
                int iResult = func.Invoke();
                Console.WriteLine(iResult.ToString());
            }
            Console.WriteLine($"****************btnThreads_Click END {Thread.CurrentThread.ManagedThreadId.ToString("00")} {DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")}***************");