1.将图片Image转换成Byte[]

///<summary>
       /// 将图片Image转换成Byte[]
      /// </summary>
       /// <paramname="Image">image对象</param>
       /// <paramname="imageFormat">后缀名</param>
       /// <returns></returns>
       public static byte[] ImageToBytes(Image Image,System.Drawing.Imaging.ImageFormat imageFormat)
       {

          if (Image == null) { return null; }

          byte[] data = http://www.cnblogs.com/peasana/archive/2012/02/13/null;

          using (MemoryStream ms= new MemoryStream())
           {

               using (Bitmap Bitmap = new Bitmap(Image))
              {

                   Bitmap.Save(ms, imageFormat);

                  ms.Position = 0;

                   data = http://www.cnblogs.com/peasana/archive/2012/02/13/new byte[ms.Length];

                  ms.Read(data, 0, Convert.ToInt32(ms.Length));

                  ms.Flush();

              }

          }

          return data;

       }

2. byte[]转换成Image

           /// <summary>
           /// byte[]转换成Image
          /// </summary>
           /// <paramname="byteArrayIn">二进制图片流</param>
           ///<returns>Image</returns>
           public staticSystem.Drawing.Image byteArrayToImage(byte[] byteArrayIn)
           {
              if (byteArrayIn == null)
                  return null;
              using (System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArrayIn))
              {
                  System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);
                  ms.Flush();
                  return returnImage;
              }
           }

3.  Image转换Bitmap

//Image转换Bitmap

   1.Bitmap img = new Bitmap(imgSelect.Image);

   2.Bitmap bmp = (Bitmap)pictureBox1.Image;

4. Bitmap转换成Image

//Bitmap转换成Image

using System.IO;

private static System.Windows.Controls.Image Bitmap2Image(System.Drawing.Bitmap Bi)
      {          
           MemoryStream ms =new MemoryStream();
           Bi.Save(ms,System.Drawing.Imaging.ImageFormat.Png);
           BitmapImage bImage= new BitmapImage();
          bImage.BeginInit();
          bImage.StreamSource = new MemoryStream(ms.ToArray());
           bImage.EndInit();
           ms.Dispose();
           Bi.Dispose();
          System.Windows.Controls.Image i = new System.Windows.Controls.Image();
           i.Source = bImage;
           return i ;
       }

5. byte[] 转换 Bitmap

//byte[] 转换 Bitmap
public static Bitmap BytesToBitmap(byte[] Bytes)
       {
           MemoryStreamstream = null;
           try
           {
              stream = new MemoryStream(Bytes);
              return new Bitmap((Image)new Bitmap(stream));
           }
           catch(ArgumentNullException ex)
           {
              throw ex;
           }
           catch(ArgumentException ex)
           {
              throw ex;
           }
           finally
           {
              stream.Close();
           }
       } 
6. Bitmap转byte[] 
    //Bitmap转byte[] 
       public static byte[] BitmapToBytes(Bitmap Bitmap)
       {
           MemoryStream ms =null;
           try
           {
              ms = new MemoryStream();
              Bitmap.Save(ms, Bitmap.RawFormat);
              byte[] byteImage = new Byte[ms.Length];
              byteImage = ms.ToArray();
              return byteImage;
           }
           catch(ArgumentNullException ex)
           {
              throw ex;
           }
           finally
           {
              ms.Close();
           }
       }
   }

Byte[]、Image、Bitmap_之间的相互转换