// 边界
string boundary = DateTime.Now.Ticks.ToString( " x " );
HttpWebRequest uploadRequest = (HttpWebRequest)WebRequest.Create(url);//url为上传的地址
uploadRequest.ContentType = " multipart/form-data; boundary= " + boundary;
uploadRequest.Method = " POST " ;
uploadRequest.Accept = " */* " ;
uploadRequest.KeepAlive = true ;
uploadRequest.Headers.Add( " Accept-Language " , " zh-cn " );
uploadRequest.Headers.Add( " Accept-Encoding " , " gzip, deflate " );
uploadRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
uploadRequest.Headers[ " Cookie " ] = cookies;//上传文件时需要的cookies
WebResponse reponse;
// 创建一个内存流
Stream memStream = new MemoryStream();
// 确定上传的文件路径
if ( ! String.IsNullOrEmpty(file))
boundary = " -- " + boundary;
// 添加上传文件参数格式边界
string paramFormat = boundary + " \r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}\r\n " ;
NameValueCollection param = new NameValueCollection();
param.Add( " fname " , Guid.NewGuid().ToString() + Path.GetExtension(file));
// 写上参数
foreach ( string key in param.Keys)
string formitem = string .Format(paramFormat, key, param[key]);
byte [] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
memStream.Write(formitembytes, 0 , formitembytes.Length);
// 添加上传文件数据格式边界
string dataFormat = boundary + " \r\nContent-Disposition: form-data; name=\"{0}\";filename=\"{1}\"\r\nContent-Type:application/octet-stream\r\n\r\n " ;
string header = string .Format(dataFormat, " Filedata " , Path.GetFileName(file));
byte [] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
memStream.Write(headerbytes, 0 , headerbytes.Length);
// 获取文件内容
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte [] buffer = new byte [ 1024 ];
int bytesRead = 0 ;
// 将文件内容写进内存流
while ((bytesRead = fileStream.Read(buffer, 0 , buffer.Length)) != 0 )
memStream.Write(buffer, 0 , bytesRead);
fileStream.Close();
// 添加文件结束边界
byte [] boundarybytes = System.Text.Encoding.UTF8.GetBytes( " \r\n\n " + boundary + " \r\nContent-Disposition: form-data; name=\"Upload\"\r\n\nSubmit Query\r\n " + boundary + " -- " );
memStream.Write(boundarybytes, 0 , boundarybytes.Length);
// 设置请求长度
uploadRequest.ContentLength = memStream.Length;
// 获取请求写入流
Stream requestStream = uploadRequest.GetRequestStream();
// 将内存流数据读取位置归零
memStream.Position = 0 ;
byte [] tempBuffer = new byte [memStream.Length];
memStream.Read(tempBuffer, 0 , tempBuffer.Length);
memStream.Close();
// 将内存流中的buffer写入到请求写入流
requestStream.Write(tempBuffer, 0 , tempBuffer.Length);
requestStream.Close();
// 获取到上传请求的响应
reponse = uploadRequest.GetResponse();