上传文件到服务器有很多种方式，按存储方式大概分为文件系统存储和数据库存储，平时用的比较多的是文件系统存储，特点是简单、方便，灵活，可选的实现方式也很多，TCP/UDP传输，或者直接通过Windows权限存放到服务器端，或者FTP服务，等等。数据库存储的特点是安全，毕竟多了一层加密，但是可想而知，效率不高，毕竟关系型数据库里存储的东西都是数据，想把文件放到数据库自然需要先转换成数据，需要取出的时候再转回来，浪费时间，而且大文件方式更不可取，试想一个读写操作需要都要占用很长时间，数据库还怎么提供服务，但是存放一下小文件，特别是非常零散的小文件还是可以用用的，毕竟是一种思路，下面的Demo简单说明了这一操作的思路：

大概过程就是将文件转换为二进制流，然后用数据库将其存储下来，下载的过程就是反向操作，将流从数据库中取出来，然后读成文件，运行界面：

核心代码

using System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.ComponentModel;using System.Data;using System.Data.SqlClient;using System.IO;using System.Text;using System.Windows;using System.Windows.Forms;using System.Windows.Input;namespace FileToDataBaseTest{    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();            this.DataContext = new MainWindowViewModel();        }    }    public class MainWindowViewModel : ViewModelBase    {        public MainWindowViewModel()        {            UploadFiles = new ObservableCollection
      
       ();            SearchFile();        }        private string filePath;        public string FilePath        {            get { return filePath; }            set            {                filePath = value;                OnPropertyChanged("FilePath");            }        }        public ObservableCollection
       
         UploadFiles { get; set; }        public UploadFileViewModel SelectedFileViewModel { get; set; }        private UploadFile file = null;        #region 载入文件        private ICommand loadFileCommand;        public ICommand LoadFileCommand        {            get            {                if (loadFileCommand == null)                {                    loadFileCommand = new RelayCommand(param => LoadFile());                }                return loadFileCommand;            }        }        public void LoadFile()        {            OpenFileDialog dialog = new OpenFileDialog();            if (dialog.ShowDialog() == DialogResult.OK)            {                FilePath = dialog.FileName;                FileInfo fileInfo = new FileInfo(@FilePath);                file = new UploadFile();                file.FileSize = fileInfo.Length;                file.FileName = fileInfo.Name;                file.FileType = fileInfo.Extension;                file.FileByteCode = new byte[file.FileSize];                FileStream stream = new FileStream(FilePath, FileMode.Open, FileAccess.Read);                BinaryReader reader = new BinaryReader(stream);                reader.Read(file.FileByteCode, 0, (int)file.FileSize);            }        }        #endregion        #region 保存文件        private ICommand saveCommand;        public ICommand SaveCommand        {            get            {                if (saveCommand == null)                {                    saveCommand = new RelayCommand(param => SaveFile());                }                return saveCommand;            }        }        public void SaveFile()        {            StringBuilder sqlStr = new StringBuilder();            sqlStr.AppendFormat(" INSERT  INTO FileDetails         ");            sqlStr.AppendFormat("         ( fName, fSize, fType, files )         ");            sqlStr.AppendFormat(" VALUES  ( @fName,          ");            sqlStr.AppendFormat("           @fSize,          ");            sqlStr.AppendFormat("           @fType,          ");            sqlStr.AppendFormat("           @files           ");            sqlStr.AppendFormat("           )         ");            Dictionary
        
          paramss = new Dictionary
         
          ();            paramss.Add("@fName", file.FileName);            paramss.Add("@fSize", file.FileSize);            paramss.Add("@fType", file.FileType);            paramss.Add("@files", file.FileByteCode);            int num = DataBaseHelper.SqlExcuteNoQueryWithParamters(sqlStr.ToString(), paramss);            if (num > 0)            {                System.Windows.MessageBox.Show("保存成功");            }        }        #endregion        #region 查询文件        public void SearchFile()        {            UploadFiles.Clear();            StringBuilder sbSql = new StringBuilder();            sbSql.AppendLine(" SELECT  fName ,  ");            sbSql.AppendLine("         fSize ,  ");            sbSql.AppendLine("         fType   ");            sbSql.AppendLine(" FROM    FileDetails  ");            DataTable dt = DataBaseHelper.GetDataTable(sbSql.ToString());            foreach (var row in dt.Rows)            {                DataRow dr = (DataRow)row;                UploadFile file = new UploadFile();                file.FileName = (string)dr["fName"];                file.FileSize = (long)dr["fSize"];                file.FileType = (string)dr["fType"];                UploadFileViewModel fileViewModel = new UploadFileViewModel(file);                UploadFiles.Add(fileViewModel);            }        }        #endregion            }    public class UploadFileViewModel : ViewModelBase    {        public UploadFileViewModel(UploadFile uploadFile)        {            this.uploadFile = uploadFile;        }        private UploadFile uploadFile;        public string FileName        {            get { return uploadFile.FileName; }            set { uploadFile.FileName = value; }        }        public long FileSize        {            get { return uploadFile.FileSize; }            set { uploadFile.FileSize = value; }        }        public string FileType        {            get { return uploadFile.FileType; }            set { uploadFile.FileType = value; }        }        public Byte[] FileByteCode        {            get { return uploadFile.FileByteCode; }            set { uploadFile.FileByteCode = value; }        }        #region 下载文件        private ICommand downloadFileCommand;        public ICommand DownloadFileCommand        {            get            {                if (downloadFileCommand == null)                {                    downloadFileCommand = new RelayCommand(param => DownloadFile());                }                return downloadFileCommand;            }        }        public void DownloadFile()        {            SaveFileDialog sfd = new SaveFileDialog();            sfd.FileName = this.FileName;            string extension = this.FileType.Replace(".", "");            sfd.Filter = string.Format("*.{0}|*.{0}", extension);            if (sfd.ShowDialog() == DialogResult.OK)            {                string savePath = sfd.FileName;                StringBuilder sbSql = new StringBuilder();                sbSql.AppendFormat("  SELECT  files           ");                sbSql.AppendFormat("  FROM    FileDetails           ");                sbSql.AppendFormat("  WHERE   fName = '{0}'           ", this.FileName);                byte[] fileBytes = DataBaseHelper.SqlExcuteScalar(sbSql.ToString()) as byte[];                FileStream stream = new FileStream(savePath, FileMode.CreateNew);                BinaryWriter writter = new BinaryWriter(stream);                writter.Write(fileBytes, 0, (int)this.FileSize);                stream.Close();                writter.Close();                System.Windows.MessageBox.Show("下载完成");            }        }        #endregion    }    public class UploadFile    {        public string FileName { get; set; }        public long FileSize { get; set; }        public string FileType { get; set; }        public byte[] FileByteCode { get; set; }    }    public class ViewModelBase : INotifyPropertyChanged    {        public event PropertyChangedEventHandler PropertyChanged;        public void OnPropertyChanged(string propertyName)        {            PropertyChangedEventHandler changedEvent = PropertyChanged;            if (changedEvent != null)            {                changedEvent.Invoke(this, new PropertyChangedEventArgs(propertyName));            }        }    }    public class DataBaseHelper    {        public static SqlConnection GetConn()        {            string connStr = string.Format("server=.;uid=sa;pwd=sql@2013;database=SaveAnyFile");            SqlConnection conn = new SqlConnection(connStr);            return conn;        }        public static DataTable GetDataTable(string commmandText)        {            SqlCommand command = new SqlCommand();            SqlConnection conn = GetConn();            command.Connection = conn;            command.CommandType = CommandType.Text;            command.CommandText = commmandText;            SqlDataAdapter adapter = new SqlDataAdapter(command);            DataTable dataTable = new DataTable();            conn.Open();            adapter.Fill(dataTable);            conn.Close();            return dataTable;        }        public static int SqlExcuteNoQueryWithParamters(string commmandText, Dictionary
          
            parameter)        {            SqlCommand command = new SqlCommand();            SqlConnection conn = GetConn();            command.Connection = conn;            command.CommandType = CommandType.Text;            command.CommandText = commmandText;            foreach (var param in parameter)            {                command.Parameters.AddWithValue(param.Key, param.Value);            }            conn.Open();            int num = command.ExecuteNonQuery();            conn.Close();            return num;        }        public static object SqlExcuteScalar(string commandText)        {            SqlCommand command = new SqlCommand();            SqlConnection conn = GetConn();            command.Connection = conn;            command.CommandType = CommandType.Text;            command.CommandText = commandText;            conn.Open();            object obj = command.ExecuteScalar();            conn.Close();            return obj;        }    }}
          
         
        
       
      

代码看起来比较乱，虽说是个Demo，但也遵循了MVVM模式，可以参考一下

ps.对于基础的东西 比如通讯协议 比如操作系统 比如编译... 还是要了解一些 万变不离其宗 无论怎样封装 组合 最重要的还是那些东西，内功有了，招式自然而然就出来了