ASP.NET2.0打通文件图片处理任督二脉

 public string PublicImageWater
 {
  get
  {
   return ImageWater;
  }
  set  //设置了水印图片的话说明是要水印图片效果的
  {
   dealtype = DealType.WaterImage;
   ImageWater = value;
  }
 }

 public string PublicFontString
 {
  get
  {
   return FontString;
  }
  set //设置了水印文字的话说明是要水印文字效果的
  {
   dealtype = DealType.WaterFont;
   FontString = value;
  }
 }

 public void DealImage()
 {
  IsDouble();

  switch( dealtype )
  {
   case DealType.WaterFont: WriteFont(); break;
   case DealType.WaterImage: WriteImg(); break;
   case DealType.DoubleDo: WriteFontAndImg(); break;
  }

 }

 private void IsDouble()
 {
  if(ImageWater+""!="" && FontString+""!="")
  {
            dealtype = DealType.DoubleDo;
  }
 }

 private void WriteFont()
 {
  //set a working directory
  //string WorkingDirectory = @"C:\Watermark_src\WaterPic";

  //define a string of text to use as the Copyright message
  //string Copyright = "Copyright ?2002 - AP Photo/David Zalubowski";

  //create a image object containing the photograph to watermark
  Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
  int phWidth = imgPhoto.Width;
  int phHeight = imgPhoto.Height;

  //create a Bitmap the Size of the original photograph
  Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

  bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

  //load the Bitmap into a Graphics object
  Graphics grPhoto = Graphics.FromImage(bmPhoto);

  //------------------------------------------------------------
  //Step #1 - Insert Copyright message
  //------------------------------------------------------------

  //Set the rendering quality for this Graphics object
  grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

  //Draws the photo Image object at original size to the graphics object.
  grPhoto.DrawImage(
   imgPhoto,                               // Photo Image object
   new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
   0,                                      // x-coordinate of the portion of the source image to draw.
   0,                                      // y-coordinate of the portion of the source image to draw.
   phWidth,                                // Width of the portion of the source image to draw.
   phHeight,                               // Height of the portion of the source image to draw.
   GraphicsUnit.Pixel);                    // Units of measure

  //-------------------------------------------------------
  //to maximize the size of the Copyright message we will
  //test multiple Font sizes to determine the largest posible
  //font we can use for the width of the Photograph
  //define an array of point sizes you would like to consider as possiblities
  //-------------------------------------------------------
  int[] sizes = new int[]{16,14,12,10,8,6,4};

  Font crFont = null;
  SizeF crSize = new SizeF();

  //Loop through the defined sizes checking the length of the Copyright string
  //If its length in pixles is less then the image width choose this Font size.
  for (int i=0 ;i<7; i++)
  {
   //set a Font object to Arial (i)pt, Bold
   //crFont = new Font("arial", sizes[i], FontStyle.Bold);

   crFont = new Font("arial",sizes[i],FontStyle.Bold);

   //Measure the Copyright string in this Font
   crSize = grPhoto.MeasureString(FontString, crFont);

   if((ushort)crSize.Width < (ushort)phWidth)
    break;
  }

  //Since all photographs will have varying heights, determine a
  //position 5% from the bottom of the image
  int yPixlesFromBottom = (int)(phHeight *.05);

  //Now that we have a point size use the Copyrights string height
  //to determine a y-coordinate to draw the string of the photograph
  float yPosFromBottom = ((phHeight - yPixlesFromBottom)-(crSize.Height/2));

  //Determine its x-coordinate by calculating the center of the width of the image
  float xCenterOfImg = (phWidth/2);

  //Define the text layout by setting the text alignment to centered
  StringFormat StrFormat = new StringFormat();
  StrFormat.Alignment = StringAlignment.Center;

  //define a Brush which is semi trasparent black (Alpha set to 153)
  SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));

  //Draw the Copyright string
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush2,                           //Brush
   new PointF(xCenterOfImg+1,yPosFromBottom+1),  //Position
   StrFormat);

  //define a Brush which is semi trasparent white (Alpha set to 153)
  SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));

  //Draw the Copyright string a second time to create a shadow effect
  //Make sure to move this text 1 pixel to the right and down 1 pixel
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush,                           //Brush
   new PointF(xCenterOfImg,yPosFromBottom),  //Position
   StrFormat);

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