刷新Webclient获取新数据

当我使用这个时，我必须重新启动应用程序才能刷新数据。有几个帖子说我应该在最后加上一个随机数字，但是我不能这么做，因为我为了工作而放了一个数字。刷新Webclient获取新数据

解决方案是什么？

void myButton_Click(object sender, RoutedEventArgs e) 
    { 
     i = 0; 
     lstService.Items.Clear(); 
     lstDestination.Items.Clear(); 
     listTime.Items.Clear(); 


     if (textSearchBox.Text == "Cranleigh Avenue") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "6445"; 
     } 

     if (textSearchBox.Text == "Cranleigh Avenue (briamaw)") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "7099"; 
     }     

     else if (textSearchBox.Text == "Brighton Station (stop A)") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "7052"; 
     } 

     else if (textSearchBox.Text == "Brighton Station (stop B)") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "7053"; 
     } 


     else if (textSearchBox.Text == "Brighton Station (stop C)") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "7054"; 
     } 


     else if (textSearchBox.Text == "Brighton Station (stop D)") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "7055"; 
     } 

     else if (textSearchBox.Text == "Sea Life Centre (stop K)") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "7642"; 
     } 

     else if (textSearchBox.Text == "Race Hill") 
     { 
      textBlock2.Text = textSearchBox.Text; 
      txtstopId.Text = "6724"; 

     } 



     string myvar = txtstopId.Text; 
     textSearchBox.Text = ""; 
     try 
     { 
      WebClient webClient = new WebClient(); 
      Uri uri = new Uri("http://www.URL.aspx?stopid=" + HttpUtility.UrlEncode(myvar)); 
      webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted); 
      webClient.OpenReadAsync(uri); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 
    } 
    public int i; 
    void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) 
    { 
     DataContractJsonSerializer ser = null; 



     try 
     { 


      ser = new DataContractJsonSerializer(typeof(RootContainer)); 
      RootContainer rootContainer = ser.ReadObject(e.Result) as RootContainer; 
      foreach (Departures em in rootContainer.Departures) 
      { 
       i = i + 1; 

       if (i < 9) 
       { 


        string id = em.ServiceName; 
        string dt = em.Destination; 
        string tm = em.DepartureTimeAsString; 
        lstService.Items.Add(id); 
        lstDestination.Items.Add(dt); 
        listTime.Items.Add(tm); 



       } 
      } 
     } 


     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 

    }

编辑

WebClient webClient = new WebClient(); 
      string url = string.Format("http://www.URL.aspx?stopid={0}&ts={1}", HttpUtility.UrlEncode(myvar) + DateTime.Now.Ticks);     
      Uri uri = new Uri(url); 
      webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted); 
      webClient.OpenReadAsync(uri);

来源

2012-04-03 Henry Edwards

我会使用时间戳不是一个随机数：

string url = string.Format("http://www.URL.aspx?stopid={0}&ts={1}", 
     HttpUtility.UrlEncode(myvar), 
     DateTime.Now.Ticks); 
Uri uri = new Uri(url);

来源

2012-04-03 14:46:57 gbanfill

，当我在上面替换此，它抛出一个formatexpection 'WebClient的Web客户端=新的Web客户端（）; string url = string.Format（“http：//www.URL.aspx？stopid = {0}＆ts = {1}”，HttpUtility.UrlEncode（myvar）+ DateTime.Now.Ticks）; Uri uri = new Uri（url）; webClient.OpenReadCompleted + = new OpenReadCompletedEventHandler（webClient_OpenReadCompleted）; webClient.OpenReadAsync（uri）; ' 编辑 - 只是加了它 – 2012-04-03 15:02:43

你可以把它放在主要问题。它格式化的事情更容易。 – gbanfill 2012-04-03 15:04:28

它应该是myVar和DAteTime.Now.Ticks之间的逗号，格式为：string.Format（“url？stopid = {0}＆ts = {1}”，HttpUtility.UrlEncode（myvar），DateTime.Now.Ticks） ; – gbanfill 2012-04-03 15:07:47

刷新Webclient获取新数据

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