标签：post httpwebrequest silverlight-3-0 c silverlight
我正在使用HTTPWebRequest在Silver light 3.0中将数据发布到Web服务器,这是我的代码
public void MakePostRequest()
{
// Create a new HttpWebRequest object.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.mywebsite.com/somepage.php");
// Set the ContentType property.
request.ContentType="application/x-www-form-urlencoded";
// Set the Method property to 'POST' to post data to the URI.
request.Method = "POST";
// Start the asynchronous operation.
request.BeginGetRequestStream(new AsyncCallback(ReadCallback), request);
// Keep the main thread from continuing while the asynchronous
// operation completes. A real world application
// could do something useful such as updating its user interface.
allDone.WaitOne();
// Get the response.
request.BeginGetResponse(new AsyncCallback(ResponseCallback), request);
}
private static void ResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse resp = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = resp.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
Console.WriteLine(responseString);
// Close the stream object.
streamResponse.Close();
streamRead.Close();
// Release the HttpWebResponse.
resp.Close();
}
private static void ReadCallback(IAsyncResult asynchronousResult)
{
IDictionary<string, string> objDictionary = new Dictionary<string, string>();
objDictionary.Add("action", "login");
objDictionary.Add("login", "myid@yahoo.com");
objDictionary.Add("password", "pass123");
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation.
// This line of code making the blocking call???
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
Stream memStream = new System.IO.MemoryStream();
byte[] boundarybytes = System.Text.Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
foreach (KeyValuePair<string, string> entry in objDictionary)
{
string key = entry.Key;
string value = entry.Value;
string formitem = string.Format(formdataTemplate, key, value);
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
memStream.Write(formitembytes, 0, formitembytes.Length);
}
memStream.Write(boundarybytes, 0, boundarybytes.Length);
memStream.Position = 0;
byte[] tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
//Writing the name value pair
postStream.Write(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
postStream.Close();
}
我面临的问题是流Stream postStream = request.EndGetRequestStream(asynchronousResult);正在进行一些阻止调用,并且我的整个应用程序似乎都已挂起..但是我可以从浏览器中打开同一网页…为什么会这样？
解决方法:
删除对Wait句柄allDone的使用.而是将对BeginGetResponse的调用移到ReadCallback方法的末尾.实际上,您可以将电话链接起来：
BeginGetRequest->ReadCallback->BeginGetResponse->ResponseCallback
顺便说一句,您正在使用“应用程序/ x-www-form-urlencoded”的内容类型.但是,您似乎正在尝试对Multipart实体主体进行编码,在这种情况下,您的内容类型应为“ multipart / form-data”.
标签：post,httpwebrequest,silverlight-3-0,c,silverlight 来源： https://codeday.me/bug/20191210/2101526.html
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