[英]How do I properly post data using the HttpWebRequest in C#
我在.Net Micro Framework中使用HttpWebRequest方法。 我正在嘗試使用以下方法將數據發布到另一台服務器。 我得到以下內容:
例外:
“ System.Net.ProtocolViolationException:HTTP方法不正確:GET”錯誤。
堆棧跟蹤:
System.Net.HttpWebRequest :: ValidateGetRequestStream System.Net.HttpWebRequest :: GetRequestStream
這個異常是否告訴我在進行POST時正在進行GET操作? 如果是這樣,我有request.Method =“ POST”,那么會導致它使用GET的原因是什么?
HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(@"http://192.168.2.1:3322/home/PostEvent");
Stream dataStream = webReq.GetRequestStream();
UTF8Encoding enc = new UTF8Encoding();
byte[] data = UTF8Encoding.UTF8.GetBytes(strMachineEvt.ToString());
dataStream.Write(data, 0, data.Length);
dataStream.Close();
webReq.Method = "POST";
webReq.ContentType = "application/json";
webReq.ContentLength = data.Length;
WebResponse response = webReq.GetResponse();
//HttpWebResponse resp = (HttpWebResponse)webReq.GetResponse();
Debug.Print(((HttpWebResponse)response).StatusDescription);
Stream respData = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
// Display the content.
Debug.Print(responseFromServer);
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
HttpWebRequest.GetRequestStream()
記錄了該異常:
Method屬性是GET或HEAD。
因此,只需在調用GetRequestStream()
之前將Method設置為“ POST”即可。
為了發布,請隨意使用以下代碼:
var request = (HttpWebRequest)WebRequest.Create(Url);
byte[] byteArray = Encoding.UTF8.GetBytes(YourParametersString);
request.Method = WebRequestMethods.Http.Post;
request.ContentLength = byteArray.Length;
request.ContentType = "application/json";
Stream postStream = request.GetRequestStream();
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
現在,如果您需要驗證並從服務器獲取答案或狀態:
using (var response = (HttpWebResponse)request.GetResponse()){
var responseValue = string.Empty;
// Error
if (response.StatusCode != HttpStatusCode.OK){
var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}
// Grab the response
using (var responseStream = response.GetResponseStream()){
if (responseStream != null){
using (var reader = new StreamReader(responseStream)){
responseValue = reader.ReadToEnd();
}
}
}
}
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