ASP.NET中实现在图片上打水印

在ASP.NET中实现在图片上打水印的程序代码：
/// <summary>
/// 在图片上加入图片版权信息
/// </summary>
/// <param name=/"strFileName/">输入图片(绝对路径)</param>
/// <param name=/"strOutfileName/">输出图片(绝对路径)</param>
/// <param name=/"strCopyRightFile/">水印图片(绝对路径)</param>
/// <param name=/"StrPlace/">水印位置</param>
/// <param name=/"bolFileName/">是否删除输入图片</param>
public static void CreateCopyRightImage(string strFileName, string strOutfileName, string strCopyRightFile, string StrPlace, bool bolFileName)
{
system.Drawing.Image MyImage = system.Drawing.Image.FromFile( strFileName );
system.Drawing.Image CopyMyImage = system.Drawing.Image.FromFile( strCopyRightFile );
system.Drawing.Bitmap OutPut = new system.Drawing.Bitmap( MyImage );
system.Drawing.Graphics GImage = system.Drawing.Graphics.FromImage( OutPut );

int IntX = 0;
int IntY = 0;
if (StrPlace == /"1/") // 在左上
{
IntX = 0;
IntY = 0;
}
else if (StrPlace == /"2/") // 在正上
{
IntX = (MyImage.Width-CopyMyImage.Width)/2;
IntY = 0;
}
else if (StrPlace == /"3/") // 在右上
{
IntX = MyImage.Width-CopyMyImage.Width;
IntY = 0;
}
else if (StrPlace == /"4/") // 在正左
{
IntX = 0;
IntY = (MyImage.Height-CopyMyImage.Height)/2;
}
else if (StrPlace == /"5/") // 在中间
{ [Page]
IntX = (MyImage.Width-CopyMyImage.Width)/2;
IntY = (MyImage.Height-CopyMyImage.Height)/2;
}
else if (StrPlace == /"6/") // 在正右
{
IntX = MyImage.Width-CopyMyImage.Width;
IntY = (MyImage.Height-CopyMyImage.Height)/2;
}
else if (StrPlace == /"7/") // 在左下
{
IntX = 0;
IntY = MyImage.Height-CopyMyImage.Height;
}
else if (StrPlace == /"8/") // 在正下
{
IntX = (MyImage.Width-CopyMyImage.Width)/2;
IntY = MyImage.Height-CopyMyImage.Height;
}
else if (StrPlace == /"9/") // 在右下
{
IntX = MyImage.Width-CopyMyImage.Width;
IntY = MyImage.Height-CopyMyImage.Height;
}
else
{
IntX = MyImage.Width-CopyMyImage.Width-10;
IntY = MyImage.Height-CopyMyImage.Height-10;
}

// 画出水印的位置
GImage.DrawImage(CopyMyImage, IntX, IntY, CopyMyImage.Width, CopyMyImage.Height);

string strExtend = strFileName.Substring(strFileName.LastIndexOf(/"./") + 1).ToLower();

switch ( strExtend )
{
case /"bmp/" :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Bmp);
break;
case /"jpg/" :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Jpeg);

break;
case /"gif/" :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Gif);
break;
case /"icon/" :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Icon); [Page]
break;
case /"png/" :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Png);
break;
case /"tif/" :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Tiff);
break;
default :
OutPut.Save(strOutfileName, system.Drawing.Imaging.ImageFormat.Jpeg);
break;
}

GImage.Dispose();
OutPut.Dispose();
MyImage.Dispose();
CopyMyImage.Dispose();

if( bolFileName )
File.Delete( strFileName );
}