个人收藏--未整理—C# http/https 上传下载文件

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c# HTTP/HTTPS 文件上传。

分类： .net 2015-02-03 08:36 541人阅读 评论(0) 收藏 举报

方法主体

[csharp] view plaincopy

1. public static string MyUploader(string strFileToUpload, string strUrl, string strFileFormName, NameValueCollection querystring, CookieContainer cookies) 
2.         { 
3. string postdata; 
4.             postdata = "?"; 
5. if (querystring != null) 
6.             { 
7. foreach (string key in querystring.Keys) 
8.                 { 
9.                     postdata += key + "=" + querystring.Get(key) + "&"; 
10.                 } 
11.             } 
12. //Uri uri = new Uri(strUrl + postdata);
14.             Uri oUri = new Uri(strUrl + postdata); 
16. string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x"); 
18. // The trailing boundary string
19. byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n"); 
21. // The post message header
22.             StringBuilder sb = new StringBuilder(); 
23.             sb.Append("--"); 
24.             sb.Append(strBoundary); 
25.             sb.Append("\r\n"); 
26.             sb.Append("Content-Disposition: form-data; name=\""); 
27.             sb.Append(strFileFormName); 
28.             sb.Append("\"; filename=\""); 
29.             sb.Append(Path.GetFileName(strFileToUpload)); 
30.             sb.Append("\""); 
31.             sb.Append("\r\n"); 
32.             sb.Append("Content-Type: "); 
33.             sb.Append("application/octet-stream"); 
34.             sb.Append("\r\n"); 
35.             sb.Append("\r\n"); 
36. string strPostHeader = sb.ToString(); 
37. byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader); 
39. // The WebRequest
40.             HttpWebRequest oWebrequest = (HttpWebRequest)WebRequest.Create(oUri); 
42. //如果是发送HTTPS请求 
43. if (strUrl.StartsWith("https", StringComparison.OrdinalIgnoreCase)) 
44.             { 
45.                 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); 
46.                 oWebrequest = WebRequest.Create(oUri) as HttpWebRequest; 
47.                 oWebrequest.ProtocolVersion = HttpVersion.Version10; 
48.             } 
49. else
50.             { 
51.                 oWebrequest = WebRequest.Create(oUri) as HttpWebRequest; 
52.             } 
54.             oWebrequest.ContentType = "multipart/form-data; boundary=" + strBoundary; 
55.             oWebrequest.Method = "POST"; 
57. // This is important, otherwise the whole file will be read to memory anyway...
58.             oWebrequest.AllowWriteStreamBuffering = false; 
60. // Get a FileStream and set the final properties of the WebRequest
61.             FileStream oFileStream = new FileStream(strFileToUpload, FileMode.Open, FileAccess.Read); 
62. long length = postHeaderBytes.Length + oFileStream.Length + boundaryBytes.Length; 
63.             oWebrequest.ContentLength = length; 
64.             Stream oRequestStream = oWebrequest.GetRequestStream(); 
66. // Write the post header
67.             oRequestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length); 
69. // Stream the file contents in small pieces (4096 bytes, max).
70. byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)oFileStream.Length))]; 
71. int bytesRead = 0; 
72. while ((bytesRead = oFileStream.Read(buffer, 0, buffer.Length)) != 0) 
73.                 oRequestStream.Write(buffer, 0, bytesRead); 
74.             oFileStream.Close(); 
76. // Add the trailing boundary
77.             oRequestStream.Write(boundaryBytes, 0, boundaryBytes.Length); 
78.             WebResponse oWResponse = oWebrequest.GetResponse(); 
79.             Stream s = oWResponse.GetResponseStream(); 
80.             StreamReader sr = new StreamReader(s); 
81.             String sReturnString = sr.ReadToEnd(); 
83. // Clean up
84.             oFileStream.Close(); 
85.             oRequestStream.Close(); 
86.             s.Close(); 
87.             sr.Close(); 
89. return sReturnString; 
90.         } 

[csharp] view plaincopy

1. private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) 
2.         { 
3. return true; //总是接受 
4.         } 

调用方法

[csharp] view plaincopy

1. CookieContainer cookies = new CookieContainer(); 
2. //add or use cookies 
3. NameValueCollection querystring = new NameValueCollection(); 
4. querystring["login_id"] = "your userid"; 
5. querystring["password"] = "your password"; 
6. string uploadfile = @"C:\Test.zip";// set to file to upload 
7. string outdata = MyUploader(filePath, updateUrl, "zipfile", querystring, cookies);

个人收藏--未整理—C# http/https 上传下载文件

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原文地址：http://www.cnblogs.com/MatureGinger/p/4776363.html