ASP.NET图片打水印代码

来源：中国IT实验室作者：佚名出处：巧巧读书 2008-05-07 进入讨论组

关键词：
asp.net
switch

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 );
    }