c# SQL資料庫image圖片檔案的保存於讀取     

       SqlConnection con = new SqlConnection("Persist Security Info=False;User id=sa;pwd=123;database=WDERPDATA_001;server=(local)");
            con.Open();
            SqlDataAdapter dat = new SqlDataAdapter("select*from TLFGL_LFRY", con);
            DataSet set = new DataSet();
            dat.Fill(set);
            DataTable tb = set.Tables[0];
            DataRow rw = tb.Rows[0];
            DataColumn cl = tb.Columns[0];
            //MessageBox.Show( cl.ColumnName.ToString());
            byte[] MyData = new byte[0];
           // MyData=tb.Rows[1]["AU_LFRY_ZJZ"];
            System.Text.StringBuilder temp = new System.Text.StringBuilder(255);

          
            Image _Image = Image.FromStream(new MemoryStream((byte[])tb.Rows[0]["AU_LFRY_ZJZ"]) );

            pictureBox1.Image = _Image;

            Bitmap bmmpp = new Bitmap(pictureBox1.Image);
            MemoryStream MS = new MemoryStream();
            //Bitmap bmp = new Bitmap(VisitorCheckIn.Class1.bmpname);
            bmmpp.Save(MS, ImageFormat.Bmp);
            Byte[] ImageData = new Byte[MS.Length];
            MS.Position = 0;
            MS.Read(ImageData, 0, Convert.ToInt32(MS.Length));
            string sql00 = "UPDATE  TLFGL_LFRY SET

[email protected] WHERE  AU_LFRY_ZJH='19850725'";
            SqlCommand dbCmd = new SqlCommand(sql00, con);
            dbCmd.CommandType = CommandType.Text;
            SqlParameter parameter = new SqlParameter("@Photo", SqlDbType.Image, int.MaxValue);
            parameter.Value = ImageData;
            dbCmd.Parameters.Add(parameter);
            dbCmd.ExecuteNonQuery();

將檔案轉換成二進位制方法：

     /// <summary>
    /// 將檔案轉換成二進位制
    /// </summary>
    /// <param name="Path">檔案路徑</param>
    /// <returns></returns>
    public static byte[] ConvertToBinary(string Path)
    {
        FileStream stream = new FileInfo(Path).OpenRead();
        byte[] buffer = new byte[stream.Length];
        stream.Read(buffer, 0, Convert.ToInt32(stream.Length));
        return buffer;
    }

將二進位制轉換成檔案方法：

using System.IO;

string filePath = "D://a.jpg";   //檔案路徑
byte[] br = ConvertToBinary(filePath);
FileStream fstream = File.Create(filePath, br.Length);
try
{  
     fstream.Write(br, 0, br.Length);   //二進位制轉換成檔案
}
catch(Exception ex)
{
     //丟擲異常資訊
}
 finally
{
     fstream.Close();    
} 

附加：二進位制與圖片互轉

    Image aa =new Bitmap(@"E:/photo/tm.jpg");

    System.IO.MemoryStream stream =new System.IO.MemoryStream();
     System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formatter 
     =new   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); formatter.Serialize(stream, aa); //將影象序列化成二進位制流                        
            stream.Position =0;
            Image bb = (Image)formatter.Deserialize(stream);  //將二進位制流序列成Image