longblob type handling in mysql

The C# data type corresponding to longblob is byte[]

 

1. Conversion between byte[] and string

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

 

 

2. Conversion between byte[] and image

        // The parameter is the path of the picture 
        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;
        }

        // Convert Image into stream data and save it as 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;
        }

 

Reprinted in: https://www.cnblogs.com/XzcBlog/p/3951924.html