c# – 当服务器返回错误时,使用WebClient访问响应主体的任何方法

发布时间：2020-12-15 17:22:18 所属栏目：百科来源：网络整理

导读：当使用WebClient类时响应状态为4xx时,是否有办法访问响应正文,例如： (webClient,evt) = // this is the event handler for the UploadStringCompleted event { if (evt.Error != null) { // can I access the response text? } }); 解决方法由于evt.Error

当使用WebClient类时响应状态为4xx时,是否有办法访问响应正文,例如：

(webClient,evt) => // this is the event handler for the UploadStringCompleted event
    {
        if (evt.Error != null)
        {
            // can I access the response text?
        }
    });

解决方法

由于evt.Error是一个WebException(而不是一个vanilla异常),这就是我所做的(请原谅VB.NET)：

''' <summary>
''' Extends a WebException to include any body text from the HTTP Response in the .Message
''' </summary>
Friend Function ExtendWebExceptionInfo(ex As Exception) As Exception
    Dim wEx As WebException = TryCast(ex,WebException)
    If wEx Is Nothing Then Return ex

    Dim exMessage As String = Nothing
    Using reader As New StreamReader(wEx.Response.GetResponseStream,System.Text.Encoding.UTF8)
        exMessage = reader.ReadToEnd
    End Using
    If Not String.IsNullOrWhiteSpace(exMessage) Then
        exMessage = String.Format("{0}{1}{1}The server says:{1}{2}",wEx.Message,vbCrLf,exMessage)
        Return New WebException(exMessage,wEx,wEx.Status,wEx.Response)
    End If
    Return wEx
End Function

（编辑：李大同）

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