网站上自己写的上传方法

protected void btnUploadFile_ServerClick(object sender, EventArgs e)
        {
            //文件上传 方法,
            string filepath = this.txtFilePath.Value;
            filepath = filepath.Replace("/","\\");

             string serverPath = Server.MapPath("~/SaveImage"); //服务器文件夹 所在的物理目录

             string savePath = serverPath +"\\"+ filepath.Substring(filepath.LastIndexOf('\\') + 1);//
           
            MemoryStream ms = ReadFileStream(filepath);
            bool result = ThunderByHttp(ms, savePath);
            string script = "";
            if (result)
            {
                script = "alert('上传成功')";
            }
            else
            {
                script = "alert('上传失败')";
            }

            ScriptManager.RegisterStartupScript(this, this.GetType(), "", script, true);

        }

/// 
        /// 将文件读入文件流中
        /// 
        /// 
        public MemoryStream ReadFileStream(string path)
        {
            FileStream fs = new FileStream(path, FileMode.Open);
            byte[] data = new byte[fs.Length];
            fs.Read(data, 0, data.Length);
            fs.Close();
            MemoryStream ms = new MemoryStream(data);
            return ms;//返回内存流 ,比如把文件,以文件流的方式写入内存中 然后从流中拿出来
            //this.pictureBox1.Image =Image.FromStream(ms);
        }

      
        /// 
        /// 网络上传输,以二进制写文件
        /// 
        /// 
        /// 
        /// 
        public static bool ThunderByHttp(Stream input, string savepath)
        {
            bool saveResult = false;
            BinaryReader binaryReader = new BinaryReader(input, System.Text.Encoding.ASCII);
            FileStream fileStream = new FileStream(savepath, FileMode.Create);
            BinaryWriter binaryWriter = new BinaryWriter(fileStream);
            try
            {
                byte[] array;
                while (true)
                {
                    bool flag = true;
                    array = binaryReader.ReadBytes(5120);
                    if (flag)
                    {
                        if (array.Length == 0)
                        {
                            break;
                        }
                    }
                    if (array.Length < 5120)
                    {
                        binaryWriter.Write(array);
                       // Console.WriteLine("writing END the data.");
                        saveResult = true;

                    }
                    binaryWriter.Write(array);
                }

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                fileStream.Close();
                binaryReader.Close();
                binaryWriter.Close();
            }

            return saveResult;
        }