WinForm 通过HttpWebRequest实现大文件上传

客户端

        public bool UploadFile(string path, string urlPath, string fileNameguid)
        {
            string url = GetHttpServer() + "/UpFile.aspx?FilePath=" + urlPath + "&FileName=" + fileNameguid;
            // 设置参数
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
                                                                // request.ContentType = "text/html";
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
            int pos = path.LastIndexOf("\\");
            string fileName = path.Substring(pos + 1);

            //请求头部信息 
            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));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr, 0, bArr.Length);
            fs.Close();

            Stream postStream = request.GetRequestStream();
            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            postStream.Write(bArr, 0, bArr.Length);
            postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            postStream.Close();

            HttpWebResponse response;
            try
            {
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = (HttpWebResponse)ex.Response;
            }

            //发送请求并获取相应回应数据
            //HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            Stream instream = response.GetResponseStream();
            StreamReader sr = new StreamReader(instream, Encoding.UTF8);
            //返回结果网页（html）代码
            string content = sr.ReadToEnd();
            return true; 
 
        }

服务端  UpFile.aspx.cs

      protected void Page_Load(object sender, EventArgs e)
        {
            if (Context.Request.Files.Count > 0)
            {
                string filePath = Context.Request["FilePath"];
                string fileName = Context.Request["FileName"];
                string SaveDir = System.Web.HttpContext.Current.Server.MapPath(filePath);
                if (!System.IO.Directory.Exists(SaveDir)) System.IO.Directory.CreateDirectory(SaveDir);
                HttpPostedFile file = Context.Request.Files[0];
                if (file.FileName != "")
                { 
                    SaveDir = System.IO.Path.Combine(SaveDir, fileName);
                    file.SaveAs(SaveDir); 
                }
            } 
        }

服务端Web.config配置

  <system.web>
     
    <httpRuntime maxRequestLength="2072576000" useFullyQualifiedRedirectUrl="false" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100"/>
     
  </system.web>

  <system.webServer>
       <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2072576000"/>
      </requestFiltering>
    </security>
  </system.webServer>