System.Net.WebException」發生在System.dll中

Question

完整的例外是這樣的：

An exception of type 'System.Net.WebException' occurred in System.dll but was not handled in user code 

Additional information: The remote server returned an error: (404) Not Found. 

我的代碼如下所示：

Public Function GetHash(password As String) As String Implements IHashManager.GetHash 
     Dim uRL As String = HttpContext.Current.Request.Url.Scheme & "://" & HttpContext.Current.Request.Url.Host & ":" & HttpContext.Current.Request.Url.Port & "/md5_hash.asp?val=" & password 

     ' Dim myWebClient As New Net.WebClient 
     Using myWebClient As New Net.WebClient 
      Return myWebClient.DownloadString(uRL) 
     End Using 
    End Function 

它輕視回線除外。

該代碼的目的是使用當前URL返回密碼的哈希值。我沒有寫這個代碼，我不確定它爲什麼會出錯。有誰知道爲什麼？

Answer 1

當您撥打myWebClient.DownloadString()時，您需要檢查uRL的值。 「附加信息」非常清楚;你會得到一個404錯誤，說明uRL中標識的資源在該位置沒有找到/不存在。