c#文件上传（上传到服务器）

首先需要创建一个窗体并拖放几个提示用于提示信息的文本 一个按钮 一个进度条

然后就开始写按钮的点击事件 双击开始

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialogTemp = new OpenFileDialog();
            DialogResult dr = openFileDialogTemp.ShowDialog();
            string address= "http://localhost:55345/FileSave.aspx";
            string fileNamePath;
            string saveName;
            //ProgressBar progressBar;
            if (dr == DialogResult.OK)
            {
                saveName = openFileDialogTemp.SafeFileName;
                fileNamePath = openFileDialogTemp.FileName;//图片路径 全路径
                Upload_Request2(address,fileNamePath,saveName,progressBar1);
            }
        }

        /// 

        /// 
        /// 
        /// 服务器地址 比如http://localhost:55345/FileSave.aspx 
        /// 上传的本地文件路径
        /// 要保存的文件名称
        /// 滚动态
        /// 
        private int Upload_Request2(string address, string fileNamePath, string saveName, ProgressBar progressBar)
        {
            int returnValue = 0;     // 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 = 300000;
            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 = 0;
                progressBar.Value = 0;
                //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;
                    progressBar.Value = (int)(offset * (int.MaxValue / length));
                    TimeSpan span = DateTime.Now - startTime;
                    double second = span.TotalSeconds;
                    label1.Text = "已用时：" + second.ToString("F2") + "秒";
                    if (second > 0.001)
                    {
                        lblSpeed.Text = "平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";
                    }
                    else
                    {
                        lblSpeed.Text = " 正在连接…";
                    }
                    Application.DoEvents();
                    size = r.Read(buffer, 0, bufferLength);
                }
                progressBar.Visible = false;
                //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();
                //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")
                {
                    MessageBox.Show("上传成功！");
                    returnValue = 1;
                }
                else if (sReturnString == "Error")
                {
                    returnValue = 0;
                }
            }
            catch
            {
                returnValue = 0;
            }
            finally
            {
                fs.Close();
                r.Close();
            }
            return returnValue;
        }

完工