关于多线程和异步

最新推荐文章于 2024-08-06 22:30:59 发布

转载最新推荐文章于 2024-08-06 22:30:59 发布 · 115 阅读

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原文链接：http://www.cnblogs.com/jx270/p/3579554.html

关于多线程和异步

计算密集型工作，采用多线程。

IO密集型工作，采用异步机制。

/// <summary>
/// 多线程 新开一个线程执行程序
/// </summary>
private void btnMutilthread_Click(object sender, EventArgs e)
      {
          var thread = new Thread(DoSomething);
          thread.Start();
      }

public void DoSomething()
      {
          var request = HttpWebRequest.Create("http://www.cnblogs.com/jx270");
          var response = request.GetResponse();
          var stream = response.GetResponseStream();
using (StreamReader reader = new StreamReader(stream))
          {
              var content = reader.ReadToEnd();
//textBox1.Text = content;
              SetText(content);
          }
      }

/// <summary>
/// 异步执行程序 减少占有CPU (DMA中断方式)
/// </summary>
private void btnAsyc_Click(object sender, EventArgs e)
      {
          var request = HttpWebRequest.Create("http://www.cnblogs.com/jx270");
          request.BeginGetResponse(this.AsyncCallbackImp, request);
      }

public void AsyncCallbackImp(IAsyncResult ar)
      {
          WebRequest request = ar.AsyncState as WebRequest;
          var response = request.EndGetResponse(ar);
          var stream = response.GetResponseStream();
using (StreamReader reader = new StreamReader(stream))
          {
              var content = reader.ReadToEnd();
//textBox1.Text = content;
              SetText(content);
          }
      }

void SetText(string argText)
      {
if (textBox1.InvokeRequired)
          {
              var callBack = new DelegateMethod(SetText);
              textBox1.Invoke(callBack, new[] { argText });
          }
else
          {
              textBox1.Text = argText;
          }
      }

delegate void DelegateMethod(string argText);