1 /// <summary>
  2         /// 使用Task，Task.Factory.StartNew，会创建新的线程
  3         /// </summary>
  4         /// <param name="sender"></param>
  5         /// <param name="e"></param>
  6         private void button4_Click(object sender, EventArgs e)
  7         {
  8             this.richTextBox1.Text = "正在处理请求...";
  9
 10             Task.Factory.StartNew(() =>
 11             {
 12                 //下面这段代码可封装一下，一个没有返回值的方法
 13                 var url = this.textBox1.Text.Trim();
 14                 var request = HttpWebRequest.Create(url);
 15                 var response = request.GetResponse();
 16                 var stream = response.GetResponseStream();
 17                 using (StreamReader reader = new StreamReader(stream))
 18                 {
 19                     var content = reader.ReadToEnd();
 20                     this.richTextBox1.Text = content;
 21                 }
 22             });
 23         }

  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         }