Is there a way to access the response body when the response status is 4xx when using the WebClient class, for example:
(webClient, evt) => // this is the event handler for the UploadStringCompleted event
{
if (evt.Error != null)
{
// can I access the response text?
}
});
Since evt.Error is a WebException (rather than a vanilla Exception), here's what I do (please excuse the 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
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.