1. Image.FromFile()返回的是某个继承自Image的具体类的对象，在这里，就是Bitmap或者Metafile其中之一。这应该算是factory pattern的一种形式。所以，Image类确实不能直接创建对象的，但这里Image.FromFile()返回的是Bitmap或者Metafile的对象。
2. Bitmap不仅仅对应于bmp，其实只要是像素式的图片格式（矢量格式不行），理论上都可以用Bitmap，就像YJPC789(雪地里的一颗星) 所说的。Image所抽象的是Bitmap和Metafile两个子类，你可以看一下msdn里的介绍。
/// <summary>
/// 将图片Image转换成Byte[]
/// </summary>
/// <param name="Image">image对象</param>
/// <param name="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 = ; data = http://www.cnblogs.com/peasana/archive/2012/02/13/new byte[ms.Length]; ms.Read(data, , Convert.ToInt32(ms.Length)); ms.Flush(); } } return data; } /// <summary>
/// byte[]转换成Image
/// </summary>
/// <param name="byteArrayIn">二进制图片流</param>
/// <returns>Image</returns>
public static System.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;
}
} //Image转换Bitmap
. Bitmap img = new Bitmap(imgSelect.Image);
. Bitmap bmp = (Bitmap)pictureBox1.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 ;
}
//byte[] 转换 Bitmap
public static Bitmap BytesToBitmap(byte[] Bytes)
{
MemoryStream stream = 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();
}
} //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();
}
}
参考文章