当调用Web请求的 "BeginGetResponse" 方法时,我收到了 "System.Net.ProtocolViolationException: 在调用 [Begin]GetResponse 之前,您必须向请求流写入ContentLength字节" 错误。
这是我的代码:
try
{
Stream dataStream = null;
WebRequest Webrequest;
Webrequest = WebRequest.Create(this.EndPointAddress);
Webrequest.Credentials = new NetworkCredential(this.username, this.password);
Webrequest.ContentType = "text/xml";
Webrequest.Method = WebRequestMethods.Http.Post;
byteArray = System.Text.Encoding.UTF8.GetBytes(xmlRequest.Children[0].InnerXML);
Webrequest.ContentLength = byteArray.Length;
dataStream = Webrequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
RequestState rs = new RequestState();
rs.Request = Webrequest;
IAsyncResult r = (IAsyncResult)Webrequest.BeginGetResponse(new AsyncCallback(RespCallback), rs);
}
catch (Exception exc)
{
TRACE.EXCEPTION(exc);
}
finally
{
dataStream.Close();
}
更具体地说,在调用函数“getRequestStream()”后,流针对长度抛出了此异常:
这是什么原因引起的?'stream.Length' threw an exception of type 'System.NotSupportedException'