1 public static QiyeMaterialMsg UploadQyImg(string path)
 2         {
 3             try
 4             {
 5                 HttpWebRequest request = WebRequest.Create($"https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token={Config.access_token}&type=image") as HttpWebRequest;
 6 
 7                 if (request != null)
 8                 {
 9                     CookieContainer cookieContainer = new CookieContainer();
10                     request.CookieContainer = cookieContainer;
11                     request.AllowAutoRedirect = true;
12                     request.Method = "POST";
13                     string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
14                     request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
15                     byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
16                     byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
17 
18                     int pos = path.LastIndexOf("\\");
19                     string fileName = path.Substring(pos + 1);
20 
21                     //请求头部信息
22                     StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
23                     byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());
24 
25                     FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
26                     byte[] bArr = new byte[fs.Length];
27                     fs.Read(bArr, 0, bArr.Length);
28                     fs.Close();
29 
30                     Stream postStream = request.GetRequestStream();
31                     postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
32                     postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
33                     postStream.Write(bArr, 0, bArr.Length);
34                     postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
35                     postStream.Close();
36 
37                     //发送请求并获取相应回应数据
38                     HttpWebResponse response = request.GetResponse() as HttpWebResponse;
39                     //直到request.GetResponse()程序才开始向目标网页发送Post请求
40                     Stream instream = response.GetResponseStream();
41                     StreamReader sr = new StreamReader(instream, Encoding.UTF8);
42                     string content = sr.ReadToEnd();
43                     return JsonHelper.JsonDeserialize<QiyeMaterialMsg>(content);
44                 }
45 
46                 return new QiyeMaterialMsg();
47             }
48             catch (Exception e)
49             {
50                 LogHelper.ErrorLog(e.Message);
51                 return new QiyeMaterialMsg { errmsg = e.Message };
52             }
53         }