public static string HttpPostMultipartFormData(string url, NameValueCollection kVDatas, string method = WebRequestMethods.Http.Post, string encoding= "UTF-8", int timeOut = -1)
{
string resultStr = "";
try
{
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = Encoding.GetEncoding(encoding).GetBytes("\r\n--" + boundary + "\r\n");
byte[] endbytes = Encoding.GetEncoding(encoding).GetBytes("\r\n--" + boundary + "--\r\n");
//1.HttpWebRequest
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.Method = method;
request.KeepAlive = true;
request.Timeout = timeOut;
using (Stream stream = request.GetRequestStream())
{
//1.1 key/value
string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
if (kVDatas != null)
{
foreach (string key in kVDatas.Keys)
{
stream.Write(boundarybytes, 0, boundarybytes.Length);
string formitem = string.Format(formdataTemplate, key, kVDatas[key]);
byte[] formitembytes = Encoding.GetEncoding(encoding).GetBytes(formitem);
stream.Write(formitembytes, 0, formitembytes.Length);
}
}
stream.Write(endbytes, 0, endbytes.Length);
}
//2.WebResponse
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (StreamReader stream = new StreamReader(response.GetResponseStream()))
{
resultStr = stream.ReadToEnd();
}
}
}
catch (WebException ex)
{
var errorSr = new StreamReader(ex.Response.GetResponseStream());
resultStr = errorSr.ReadToEnd();
}
return resultStr;
}
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