从SQL读出的二进制流放在单独Page里，怎么控制图片长宽缩放
1： Response.ContentType = "image/Gif ";//设定输出文件类型,为什么一定要设置此格式,Response.ContentType =myDataReader[ "PhotoType "].ToString()却无效？
2： int length = (int)dr[ "PhotoLength "];
if (length == 0)//照片大小为0
{
Response.TransmitFile( "~/images/noPhoto.gif ");
}
else//照片大小不为0
{
Response.OutputStream.Write((byte[])dr[ "Photo "], 0, length);
dr.Close();
}
代码放置在单独Page里，别的页通过HyperLink的URL传递变量到此页，再根据变量读取SQL，得到PHOTO的字节流，类型，字节长度，现在的问题是：图片有时候非常大，或者非常小，通过HyperLink的宽度和长度无法控制， 要什么方法才能实现不管大的小的图片，都缩放到一个固定的大小（打印要求2寸照片大小）？
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[解决办法]
参考：http://topic.csdn.net/t/20051212/15/4454248.html
[解决办法]
生成缩略图protected void Button1_Click1(object sender, EventArgs e) { if (File1.PostedFile.FileName != null) { string namestr = Path.GetFileName(File1.PostedFile.FileName);//提取文件名 File1.PostedFile.SaveAs(Server.MapPath( ". ") + @ "\ " + namestr); Image2.Visible = true; Image2.ImageUrl = namestr; System.Drawing.Image image, aNewImage; image = System.Drawing.Image.FromStream(File1.PostedFile.InputStream); decimal width = image.Width; decimal height = image.Height; int newwidth, newheight; if (width > height) { newwidth = 150; newheight = (int)(height / width * 150); } else { newheight = 150; newwidth = (int)(width / height * 150); } aNewImage = image.GetThumbnailImage(newwidth, newheight, null, IntPtr.Zero); Bitmap output = new Bitmap(aNewImage); Graphics g = Graphics.FromImage(output); g.DrawString( "LonoL ", new Font( "Courier New ", 9), new SolidBrush(Color.Red), 60, 60);//写版权信息及文本格式及位置 output.Save(Server.MapPath( "~/ ") + @ "\s_ " + namestr, System.Drawing.Imaging.ImageFormat.Jpeg); Image1.Visible = true; Image1.ImageUrl = "s_ " + namestr; } else { Response.Write( "B "); } }}
