1 /// <summary>
2 /// 上传文件
3 /// </summary>
4 /// <param name="url"></param>
5 /// <param name="files"></param>
6 /// <param name="data"></param>
7 /// <param name="encoding"></param>
8 /// <returns></returns>
9 public static string HttpUploadFile(string url, string[] files, NameValueCollection data, Encoding encoding)
10 {
11 string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
12 byte[] boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
13 byte[] endbytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
14
15 //1.HttpWebRequest
16 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
17 request.ContentType = "multipart/form-data; boundary=" + boundary;
18 request.Method = "POST";
19 request.KeepAlive = true;
20 request.Credentials = CredentialCache.DefaultCredentials;
21
22 using (Stream stream = request.GetRequestStream())
23 {
24 //1.1 key/value
25 string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
26 if (data != null)
27 {
28 foreach (string key in data.Keys)
29 {
30 stream.Write(boundarybytes, 0, boundarybytes.Length);
31 string formitem = string.Format(formdataTemplate, key, data[key]);
32 byte[] formitembytes = encoding.GetBytes(formitem);
33 stream.Write(formitembytes, 0, formitembytes.Length);
34 }
35 }
36
37 //1.2 file
38 string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";
39 byte[] buffer = new byte[4096];
40 int bytesRead = 0;
41 for (int i = 0; i < files.Length; i++)
42 {
43 stream.Write(boundarybytes, 0, boundarybytes.Length);
44 string header = string.Format(headerTemplate, "file" + i, Path.GetFileName(files[i]));
45 byte[] headerbytes = encoding.GetBytes(header);
46 stream.Write(headerbytes, 0, headerbytes.Length);
47 using (FileStream fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))
48 {
49 while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
50 {
51 stream.Write(buffer, 0, bytesRead);
52 }
53 }
54 }
55
56 //1.3 form end
57 stream.Write(endbytes, 0, endbytes.Length);
58 }
59 //2.WebResponse
60 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
61 using (StreamReader stream = new StreamReader(response.GetResponseStream()))
62 {
63 return stream.ReadToEnd();
64 }
65 }
