[英]c# Webrequest Post and GetResponse
我正在编写一个程序,它将向网站提交XML。 编写的代码工作正常, 但有时它因某些原因停止工作,抛出System.Net.ProtocolViolationException。 我可以关闭程序并重新运行 - 它再次开始工作就好了。
这是我正在使用的代码:
private string Summit(string xml)
{
string result = string.Empty;
StringBuilder sb = new StringBuilder();
try {
WebRequest request = WebRequest.Create(this.targetUrl);
request.Timeout = 800 * 1000;
RequestState requestState = new RequestState(xml);
requestState.Request = request;
request.ContentType = "text/xml";
// Set the 'Method' property to 'POST' to post data to a Uri.
requestState.Request.Method = "POST";
requestState.Request.ContentType = "text/xml";
// Start the Asynchronous 'BeginGetRequestStream' method call.
IAsyncResult r = (IAsyncResult)request.BeginGetRequestStream(new AsyncCallback(ReadCallBack), requestState);
// Pause the current thread until the async operation completes.
// Console.WriteLine("main thread waiting...");
allDone.WaitOne();
// Assign the response object of 'WebRequest' to a 'WebResponse' variable.
WebResponse response = null;
try {
response =request.GetResponse();
} catch (System.Net.ProtocolViolationException ex) {
response = null;
request.Abort();
request = null;
requestState = null;
return "";
}
//Console.WriteLine("The string has been posted.");
//Console.WriteLine("Please wait for the response...");
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
Char[] readBuff = new Char[256];
int count = streamRead.Read(readBuff, 0, 256);
//StringBuilder sb = new StringBuilder();
while (count > 0) {
String outputData = new String(readBuff, 0, count);
sb.Append(outputData);
count = streamRead.Read(readBuff, 0, 256);
}
// Close the Stream Object.
streamResponse.Close();
streamRead.Close();
//allDone.WaitOne();
// Release the HttpWebResponse Resource.
response.Close();
//return sb.ToString();
} catch (WebException webex) {
Debug.WriteLine(webex.Message);
} catch (System.Web.Services.Protocols.SoapException soapex) {
Debug.WriteLine(soapex.Message);
} catch (System.Net.ProtocolViolationException ex) {
Debug.WriteLine(ex.Message);
} catch (Exception ex) {
Debug.WriteLine(ex.Message);
}
return sb.ToString();
}
private static void ReadCallBack(IAsyncResult asyncResult)
{
try {
RequestState myRequestState = (RequestState)asyncResult.AsyncState;
WebRequest myWebRequest2 = myRequestState.Request;
// End of the Asynchronus request.
Stream responseStream = myWebRequest2.EndGetRequestStream(asyncResult);
//Convert the string into a byte array.
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] ByteArray = encoder.GetBytes(myRequestState.Xml);
// Write data to the stream.
responseStream.Write(ByteArray, 0, myRequestState.Xml.Length);
responseStream.Close();
} catch (WebException e) {
Console.WriteLine("\nReadCallBack Exception raised!");
Console.WriteLine("\nMessage:{0}", e.Message);
Console.WriteLine("\nStatus:{0}", e.Status);
}
allDone.Set();
}
response =request.GetResponse()
是失败并发出错误
如果设置ContentLength> 0或SendChunked == true,则必须提供请求正文。 通过在[Begin] GetResponse之前调用[Begin] GetRequestStream来完成此操作。
任何帮助将不胜感激。
由于我们正在进行异步调用,因此这很棘手。
按以下顺序执行此操作:
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request)
然后在'GetRequestStreamCallback(IAsyncResult asynchronousResult)'调用:
request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request)
最后,在GetResponse中,请务必关闭该流:
response.Close();
allDone.Set();
MSDN解释它是一个非常好的工作: http : //msdn.microsoft.com/en-us/library/system.net.httpwebrequest.begingetrequeststream.aspx
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.