mysql中的longblob类型处理

longblob 对应的 C#数据类型为 byte[]

 

1.byte[] 与 string 之间的转换

　　byte[] bb = Encoding.UTF8.GetBytes(ss);

　　string s = Encoding.UTF8.GetString(bb);

 

 

2.byte[] 与 image 之间的转换

        //参数是图片的路径

        public byte[] GetPictureData(string imagePath)

        {

            FileStream fs = new FileStream(imagePath, FileMode.Open);

            byte[] byteData = new byte[fs.Length];

            fs.Read(byteData, 0, byteData.Length);

            fs.Close();

            return byteData;

        }

        //将Image转换成流数据，并保存为byte[] 

        public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)

        {

            MemoryStream mstream = new MemoryStream();

            imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);

            byte[] byData = new Byte[mstream.Length];

            mstream.Position = 0;

            mstream.Read(byData, 0, byData.Length); mstream.Close();

            return byData;

        }

  public static BitmapImage ByteArrayToBitmapImage(byte[] byteArray)

        {

            BitmapImage bmp = null;

            try

            {

                bmp = new BitmapImage();

                bmp.BeginInit();

                bmp.StreamSource = new MemoryStream(byteArray);

                bmp.EndInit();

            }

            catch

            {

                bmp = null;

            }



            return bmp;

        }