用WebRequest VB .Net重新加载URL

Question

我在我的测试html页面上放置了在线计数器，当我尝试重新加载此页面时，计数器没有刷新，所以看起来这个WebRequest不工作​​，感谢您的帮助，这里是我得到的此刻：

Public Class Form2 

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
     Dim sites() As String = New String() {"TextBox1.Text"} 
       Debug.WriteLine(sites.Length) 
     'Stop 
     For Each s As String In sites 
      Dim t As New Threading.Thread(AddressOf threadimportbtcUSD) 
      t.IsBackground = True 
      t.Start(s) 
      Threading.Thread.Sleep(1000) 
     Next 
    End Sub 

    Private Sub threadimportbtcUSD(s As Object) 
     Dim asite As String = DirectCast(s, String) 
     Do 
      Debug.WriteLine(DateTime.Now.ToLongTimeString) 
      Dim postReq As Net.HttpWebRequest = DirectCast(Net.WebRequest.Create(asite), Net.HttpWebRequest) 

      Try 
       postReq.Timeout = 5000 
       postReq.ContentType = "application/x-www-form-urlencoded" 
       postReq.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)" 
       Dim postresponse As Net.HttpWebResponse 
       postresponse = DirectCast(postReq.GetResponse(), Net.HttpWebResponse) 
       Dim risposta As String 
       Dim postreqreader As New IO.StreamReader(postresponse.GetResponseStream()) 
       risposta = postreqreader.ReadToEnd 
       postreqreader.Close() 
       postreqreader.Dispose() 

       postresponse.Close() 
       postresponse.Dispose() 
      Catch ex As Exception 
       Debug.WriteLine(ex.ToString) 
       postReq.Abort() 
      End Try 
      Threading.Thread.Sleep(1000) 
     Loop 
    End Sub 
End Class 

Answer 1

试试这个：

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
    doSubmitHTTPRequest(TextBox1.Text) 
End Sub 

Private Sub doSubmitHTTPRequest(ByVal url As String) 
    Dim webRequest As Net.HttpWebRequest = CType(System.Net.HttpWebRequest.Create(url & "?nocache=" & DateTime.Now.Ticks), Net.HttpWebRequest) 
    webRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)" 
    webRequest.Method = "GET" 
    webRequest.ContentType = "text/xml; encoding='utf-8'" 

    Dim responseReader As IO.StreamReader = New IO.StreamReader(webRequest.GetResponse().GetResponseStream()) 
    Dim responseData As String = responseReader.ReadToEnd() 

    responseReader.Close() 
    webRequest.GetResponse().Close() 

    'responseData <= variable which contains the response from the server 
End Sub