如果使用多线程,应该会遇到这样的一个问题,在子线程中想调用主线程中(Form1)控件,提示报错!
可以使用Invoke方法调用。
this.Invoke(new MethodInvoker(() =>{ this.rTxtLog.AppendText("在线程内调用主线程中控件 " + Environment.NewLine);}));
异步委托学习,
using System;using System.Collections.Generic;using System.Linq;using System.Runtime.Remoting.Messaging;using System.Text;using System.Threading;using System.Threading.Tasks;namespace 线程与异步委托练习{ class Program { //声明一个委托, public delegate int AddFunDel(int a, int b); static void Main(string[] args) { Console.WriteLine("主线程{0},已启动...", Thread.CurrentThread.ManagedThreadId); #region 线程 ////ParameterizedThreadStart 有参委托 ////ThreadStart 无参委托 //Thread thread = new Thread(new ThreadStart(MyFun)); ////设置线程名称 给程序员看的。 //thread.Name = "MyFun"; ////设置为后台线程。当主线程被关闭时,后台子线程自动被关闭。 //thread.IsBackground = true; ////更改状态,并没有执行,只是告诉CPU,可以执行了。 //thread.Start(); #endregion #region 有参线程 ////Thread thread2 = new Thread(new ParameterizedThreadStart(MyFun2)); //Thread thread2 = new Thread(a => { // while (true) // { // Console.WriteLine("子线程{0},正在执行中。参数值:{1}", Thread.CurrentThread.ManagedThreadId, a); // Thread.Sleep(1000); // } //}); //thread2.Name = "MyFun2"; //thread2.IsBackground = true; ////设置优先级,只是建议告诉CPU处理。 //thread2.Priority = ThreadPriority.Highest; //thread2.Start(99); #endregion #region 异步委托 //AddFunDel aDel = new AddFunDel(AddFun); ////通过异步调用这个委托 //IAsyncResult iresult = aDel.BeginInvoke(3, 5, null, null); ////...异步委托,在新建子线程中执行委托中方法,主线程被阻塞状态。 //int num = aDel.EndInvoke(iresult); //Console.WriteLine("计算结果:{0} , 执行线程{1}", num, Thread.CurrentThread.ManagedThreadId); #endregion #region 异步委托回调函数 AddFunDel aDel = new AddFunDel(AddFun); //AsyncCallback IAsyncResult iresult = aDel.BeginInvoke(3, 5, new AsyncCallback(MyAsyncCallback), 30); //主线程不会阻塞 while (!iresult.IsCompleted) //IsCompleted 检测异步操作是否已完成。 { Console.WriteLine("主线程继续执行中..."); Thread.Sleep(1000); } #endregion Console.ReadKey(); } static void MyFun() { while (true) { Console.WriteLine("子线程{0},正在执行中。", Thread.CurrentThread.ManagedThreadId); Thread.Sleep(1000); } } static void MyFun2(object a) { Console.WriteLine("子线程{0},正在执行中。参数值:{1}", Thread.CurrentThread.ManagedThreadId, a); } static int AddFun(int a, int b) { Console.WriteLine("子线程{0},正在执行中,开始运算a+b", Thread.CurrentThread.ManagedThreadId); Thread.Sleep(5000); return a + b; } //异步委托回调函数 static void MyAsyncCallback(IAsyncResult result) { AsyncResult aResult = (AsyncResult)result; //封装类 通过接口 实现多态 AddFunDel addDel = (AddFunDel)aResult.AsyncDelegate; //封装委托 int num = addDel.EndInvoke(result); //获取异步操作结果 Console.WriteLine("计算结果:{0} , 执行线程{1}", num, Thread.CurrentThread.ManagedThreadId); int i = (int)aResult.AsyncState; //BeginInvoke方法中最后一个参数 Console.WriteLine("BeginInvoke最后一个参数调用:{0}", i); } }}