怪事!!!把JPG,GIF,PNG改变大小然后Response.OutputStream,同样的方法就是PNG出现异常!!!!

[MPU]

把JPG,GIF,PNG改变大小然后Response.OutputStream,同样的方法就是PNG出现异常!!!!

如果用JPG ,Gif,都很正常网页可以显示,就是用PNG...
System.Drawing.Imaging.ImageFormat.Png

就出现异常!!!!!!!!!!!!!

//////////////////////////JPG GIF PNG ///////////////////////////
this.Response.ContentType = "image/gif";
System.Drawing.Image.GetThumbnailImageAbort myCallback =
new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);

System.Drawing.Bitmap myBitmap = new Bitmap("D:\\CppPNG.jpg");//D:\\CppPNG.png

System.Drawing.Image myThumbnail = myBitmap.GetThumbnailImage(120, 80, myCallback, IntPtr.Zero);
myThumbnail.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);
Response.OutputStream.Close();//"D:\\CppPNG.png"