C#记一次http协议multipart/form-data的boundary问题

HttpWebRequest request = WebRequest.Create(new Uri(url)) as HttpWebRequest;
request.Method = "POST";
request.Host = Properties.Settings.Default.IP;
request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko";
request.Accept = "*/*";
request.CookieContainer = cc;
request.KeepAlive = true;
string postData = string.Format("action=cx&hphm={0}&hpzl=&jclb=&detlsh=&clpp=&clxh=&rlzl=&pfbz=&jcff=&evl=&staName={1}&detLineId=&syxz=&rqyi={2}&rqer={3}&RQXZ=JCRQ&CXJL=Jiance&cllb=&clgs=&zcrq=&zzl=&clsbdh=&syr=&ccdjrq=&page={4}&rows=10", hphm, staName, rqyi, rqer, page);
byte[] postdatabyte = Encoding.GetEncoding("utf-8").GetBytes(postData);
request.ContentLength = postdatabyte.Length;
using (Stream stream = request.GetRequestStream())
{
	stream.Write(postdatabyte, 0, postdatabyte.Length);
}
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")))
{
	string temp = reader.ReadToEnd();
}

string url = "http://112.17.158.12:8180/intf/services/query";
HttpWebRequest request = WebRequest.Create(new Uri(url)) as HttpWebRequest;
request.Method = "POST";
request.Host = "112.17.158.12:8180";
request.ContentType = "multipart/form-data; ";
request.UserAgent = "PostmanRuntime/7.17.1";
request.Accept = "*/*";
request.KeepAlive = true;
string postData = @"jkuser=33088102&jkpasswd=33088102&jsondata={""jkid"":""R10"",""requestTime"":""20190919110603"",""body"":[{""inspstationcode"":""33088102""}]}";
byte[] postdatabyte = Encoding.GetEncoding("utf-8").GetBytes(postData);
request.ContentLength = postdatabyte.Length;
using (Stream stream = request.GetRequestStream())
{
	stream.Write(postdatabyte, 0, postdatabyte.Length);
}
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")))
{
	string temp = reader.ReadToEnd();
}

string url = "http://112.17.158.12:8180/intf/services/query";
string boundary = "--------------------------" + DateTime.Now.Ticks.ToString("x");
string boundary2 = "--" + boundary;
HttpWebRequest request = WebRequest.Create(new Uri(url)) as HttpWebRequest;
request.Method = "POST";
request.Host = "112.17.158.12:8180";
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.UserAgent = "PostmanRuntime/7.17.1";
request.Accept = "*/*";
request.KeepAlive = true;
StringBuilder sb = new StringBuilder();
sb.Append(boundary2 + "\r\n");
sb.Append(@"Content-Disposition: form-data; name=""jkuser""" + "\r\n\r\n");
sb.Append("33088102" + "\r\n");
sb.Append(boundary2 + "\r\n");
sb.Append(@"Content-Disposition: form-data; name=""jkpasswd""" + "\r\n\r\n");
sb.Append("33088102" + "\r\n");
sb.Append(boundary2 + "\r\n");
sb.Append(@"Content-Disposition: form-data; name=""jsondata""" + "\r\n\r\n");
sb.Append(@"{""jkid"":""R10"",""requestTime"":""20190919110603"",""body"":[{""inspstationcode"":""33088102""}]}" + "\r\n");
sb.Append(boundary2 + "--" + "\r\n");
string postData = sb.ToString();
byte[] postdatabyte = Encoding.GetEncoding("utf-8").GetBytes(postData);
request.ContentLength = postdatabyte.Length;
using (Stream stream = request.GetRequestStream())
{
    stream.Write(postdatabyte, 0, postdatabyte.Length);
}
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")))
{
    string temp = reader.ReadToEnd();
}