有没有办法在使用WebClient类时响应状态为4xx时访问响应体,例如:
(webClient, evt) => // this is the event handler for the UploadStringCompleted event
{
if (evt.Error != null)
{
// can I access the response text?
}
});
最佳答案
由于 evt.Error 是一个 WebException(而不是一个普通的异常),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
关于c# - 当服务器返回错误时,有什么方法可以使用 WebClient 访问响应正文?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/8381576/