标签:ati 自定义类 cal 结果 write syn manage actor 继承
APM模式:
.net 1.0时期就提出的一种异步模式,并且基于IAsyncResult接口实现BeginXXX和EndXXX类似的方法。
.net中有很多类实现了该模式(比如HttpWebRequest),同时我们也可以自定义类来实现APM模式(继承IAsyncResult接口并且实现BeginXXX和EndXXX方法)
1 /// <summary> 2 /// 异步 3 /// </summary> 4 /// <param name="sender"></param> 5 /// <param name="e"></param> 6 private void button2_Click(object sender, EventArgs e) 7 { 8 //先清空上一次查询结果 9 this.richTextBox1.Text = ""; 10 11 var url = this.textBox1.Text.Trim(); 12 var request = HttpWebRequest.Create(url); 13 request.BeginGetResponse(AsyncCallbackImpl, request);//BeginGetResponse,发起异步请求 14 } 15 16 /// <summary> 17 /// 回调 18 /// </summary> 19 /// <param name="ar"></param> 20 public void AsyncCallbackImpl(IAsyncResult ar) 21 { 22 HttpWebRequest request = ar.AsyncState as HttpWebRequest; 23 var response = request.EndGetResponse(ar);//EndGetResponse,异步请求完成 24 var stream = response.GetResponseStream(); 25 StringBuilder sb = new StringBuilder(); 26 sb.AppendLine("当前线程Id:" + Thread.CurrentThread.ManagedThreadId); 27 using (StreamReader reader = new StreamReader(stream)) 28 { 29 var content = reader.ReadLine(); 30 sb.AppendLine(content); 31 this.richTextBox1.Text = sb.ToString(); 32 } 33 } 34
1 Func<int, int> func = (i) => i + 1; 2 func.BeginInvoke(5, (asyncResult) => { 3 //Console.WriteLine("call back,param:"+result.AsyncState); 4 int result = func.EndInvoke(asyncResult); 5 Console.WriteLine("result:"+ result); 6 }, null);
EAP模式:
基于事件的异步模式是.net 2.0提出的,实现了基于事件的异步模式的类将具有一个或者多个以Async为后缀的方法和对应的Completed事件,并且这些类都支持异步方法的取消、进度报告和报告结果。然而.net中并不是所有的类都支持EAP。
当调用基于事件的EAP模式的类的XXXAsync方法时,就开始了一个异步操作,并且基于事件的EAP模式是基于APM模式之上的,而APM又是建立在委托之上的。下面的Demo就以BackgroundWorker类来演示如何使用EAP异步。
1 BackgroundWorker worker = new BackgroundWorker(); 2 worker.DoWork += Worker_DoWork; 3 worker.RunWorkerCompleted += Worker_RunWorkerCompleted; 4 worker.RunWorkerAsync(null); 5 6 private static void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) 7 { 8 Console.WriteLine("dowork completed"); 9 } 10 11 private static void Worker_DoWork(object sender, DoWorkEventArgs e) 12 { 13 Console.WriteLine("dowork"); 14 }
TAP模式:
.net 4.0为我们带来了Task的异步,我们有以下三种方法创建Task。
1,Task.Factory.StartNew,比较常用。
2,Task t1 = new Task(() => { Console.WriteLine("t1 start"); }); t1.Start();
3,Task.Run,是.net 4.5中增加的。
4,Task.FromResult,如果结果是已计算,就可以使用这种方法来创建任务。
1 /// <summary> 2 /// 使用async/await 3 /// </summary> 4 /// <param name="sender"></param> 5 /// <param name="e"></param> 6 private async void button5_Click(object sender, EventArgs e) 7 { 8 this.richTextBox1.Text = "正在处理请求..."; 9 10 await DoWorkAsync(); 11 } 12 13 public async Task DoWorkAsync() 14 { 15 var url = this.textBox1.Text.Trim(); 16 var request = HttpWebRequest.Create(url); 17 var response = request.GetResponse(); 18 var stream = response.GetResponseStream(); 19 using (StreamReader reader = new StreamReader(stream)) 20 { 21 var content = reader.ReadToEnd(); 22 this.richTextBox1.Text = content; 23 } 24 } 25 26 View Code
标签:ati 自定义类 cal 结果 write syn manage actor 继承
原文地址:https://www.cnblogs.com/fanfan-90/p/12006157.html