c#上传⼤⽂件⽅法客户端代码：
/// <summary>
/// 将本地⽂件上传到指定的服务器(HttpWebRequest⽅法)
/// </summary>
/// <param name="address">⽂件上传到的服务器</param>
/// <param name="fileNamePath">要上传的本地⽂件（全路径）</param>
大文件发送/// <param name="saveName">⽂件上传后的名称</param>
/// <returns>服务器反馈信息</returns>
private string Upload_Request(string address, string fileNamePath, string saveName)
{
// 要上传的⽂件
FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(fs);
//时间戳
string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");
//请求头部信息
StringBuilder sb = new StringBuilder();
sb.Append("--");
sb.Append(strBoundary);
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=\"");
sb.Append("file");
sb.Append("\"; filename=\"");
sb.Append(saveName);
sb.Append("\"");
sb.Append("\r\n");
sb.Append("Content-Type: ");
sb.Append("application/octet-stream");
sb.Append("\r\n");
sb.Append("\r\n");
sb.Append("\r\n");
string strPostHeader = sb.ToString();
byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);
// 根据uri创建HttpWebRequest对象
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));            httpReq.Method = "POST";
//对发送的数据不使⽤缓存【重要、关键】
httpReq.AllowWriteStreamBuffering = false;
//设置获得响应的超时时间（300秒）
//httpReq.Timeout = 300000;
httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
long fileLength = fs.Length;
httpReq.ContentLength = length;
try
{
//每次上传4k
int bufferLength = 4096;
byte[] buffer = new byte[bufferLength];
//已上传的字节数
long offset = 0;
//开始上传时间
DateTime startTime = DateTime.Now;
int size = r.Read(buffer, 0, bufferLength);
Stream postStream = httpReq.GetRequestStream();
/
/发送请求头部消息
postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
while (size > 0)
{
postStream.Write(buffer, 0, size);
offset += size;
TimeSpan span = DateTime.Now - startTime;
//1024*1024=1048576
size = r.Read(buffer, 0, bufferLength);
}
//添加尾部的时间戳
postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
postStream.Close();
//获取服务器端的响应
WebResponse webRespon = httpReq.GetResponse();
Stream s = webRespon.GetResponseStream();
StreamReader sr = new StreamReader(s);
//读取服务器端返回的消息
string serverMsg = sr.ReadLine();
s.Close();
sr.Close();
}
catch (Exception ex)
{
}
finally
{
fs.Close();
r.Close();
}
return "";
}
服务端：
HttpPostedFileBase file = Request.Files[0];
file.SaveAs(Server.MapPath("~/file/k.iso"));
客户端调⽤：
Upload_Request("localhost:7115/test/index", "d:\\t.rar", "kk");