System.Net.WebException'发生在 System.dll

Question

完整的异常如下所示：

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.

我的代码如下所示：

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

它在返回线上抛出异常。

代码的目的是使用当前 URL 返回密码的哈希值。我没有编写此代码，我不确定它为什么会出错。有谁知道为什么？

Answer 1

当您调用myWebClient.DownloadString() 时，您需要检查uRL 的值。 “附加信息”很清楚；您收到一个 404 错误，指出在 uRL 中标识的资源在该位置未找到/不存在。