C# 之 向服务器上传资源

　　首先写客服端，winform 应用 或者 WPF 应用 模拟一个post提交：

　　　　　/// <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>
        /// <param name="saveName">文件上传后的名称</param>
        /// <param name="progressBar">上传进度条</param>
        /// <returns>成功返回1，失败返回0</returns>
        private int Upload_Request2(string address, string fileNamePath, string saveName, ProgressBar progressBar)
        {
            int returnValue = ;     

　　　　　　　// 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");
            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
            httpReq.AllowWriteStreamBuffering = false;     //设置获得响应的超时时间（300秒）
            httpReq.Timeout = ;
            httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
            long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
            long fileLength = fs.Length;
            httpReq.ContentLength = length;
            try
            {
                progressBar.Maximum = int.MaxValue;
                progressBar.Minimum = ;
                progressBar.Value = ;
                //每次上传4k
                int bufferLength = ;
                byte[] buffer = new byte[bufferLength]; //已上传的字节数
                long offset = ;         //开始上传时间
                DateTime startTime = DateTime.Now;
                int size = r.Read(buffer, , bufferLength);
                Stream postStream = httpReq.GetRequestStream();         //发送请求头部消息
                postStream.Write(postHeaderBytes, , postHeaderBytes.Length);
                while (size > )
                {
                    postStream.Write(buffer, , size);
                    offset += size;
                    progressBar.Value = (int)(offset * (int.MaxValue / length));
                    TimeSpan span = DateTime.Now - startTime;
                    double second = span.TotalSeconds;
                    lblTime.Text = "已用时：" + second.ToString("F2") + "秒";
                    if (second > 0.001)
                    {
                        lblSpeed.Text = "平均速度：" + (offset /  / second).ToString("0.00") + "KB/秒";
                    }
                    else
                    {
                        lblSpeed.Text = " 正在连接…";
                    }
                    lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";
                    lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";
                    Application.DoEvents();
                    size = r.Read(buffer, , bufferLength);
                }
                //添加尾部的时间戳
                postStream.Write(boundaryBytes, , boundaryBytes.Length);
                postStream.Close();         //获取服务器端的响应
                WebResponse webRespon = httpReq.GetResponse();
                Stream s = webRespon.GetResponseStream();
                //读取服务器端返回的消息
                StreamReader sr = new StreamReader(s);
                String sReturnString = sr.ReadLine();
                s.Close();
                sr.Close();
                if (sReturnString == "Success")
                {
                    returnValue = ;
                }
                else if (sReturnString == "Error")
                {
                    returnValue = ;
                }
            }
            catch
            {
                returnValue = ;
            }
            finally
            {
                fs.Close();
                r.Close();
            } return returnValue;
        }  

　　接收文件的WebForm添加一个Save.aspx页面，Load方法如下：

　　 protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Files.Count > )
        {
            try
            {
                HttpPostedFile file = Request.Files[];
                //string filePath = "C:\\Documents and Settings\\Administrator\\桌面\\2\\" + file.FileName;//this.MapPath("UploadDocument")
                string filePath = "D:\\SourceSafe\\testupform\\" + file.FileName;
                file.SaveAs(filePath);
                Response.Write("Success");
            }
            catch
            {
                Response.Write("Error");
            }
        }
        else
        {
            Response.Write("Error1");
        }  
    }  

　　

　　同时需要配置WebConfig文件的httpRuntime 如下：

<httpRuntime maxRequestLength="102400" executionTimeout="300000"/>

　　不修改配置，默认最大只能上传4M了。要是想上传更大的文件，maxRequestLength（KB），executionTimeout（毫秒）设置大些，另外别忘了看看IIS的连接超时是否设置为足够大。

　　注意：IIS7及以后的 Web.config 的配置方式与之前略有不同。见：IIS 之 通过 Web.config 修改文件上传大小限制设置方法 。