C#.NET 图片水印添加代码

using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.IO;namespace Pub.Class{ /// <summary> /// 添加水印类 只支持添加图片水印 /// </summary> public class Watermark {  #region 私有成员  private string modifyImagePath=null; private string drawedImagePath=null; private int rightSpace; private int bottoamSpace; private int lucencyPercent=70; private string outPath=null;  #endregion  #region 构造器  /// <summary>  /// 构造函数  /// </summary>  public Watermark() { }  #endregion  #region 属性  /// <summary> /// 获取或设置要修改的图像路径 /// </summary> public string ModifyImagePath { get{return this.modifyImagePath;} set{this.modifyImagePath=value;} } /// <summary> /// 获取或设置在画的图片路径(水印图片) /// </summary> public string DrawedImagePath { get{return this.drawedImagePath;} set{this.drawedImagePath=value;} } /// <summary> /// 获取或设置水印在修改图片中的右边距 /// </summary> public int RightSpace { get{return this.rightSpace;} set{this.rightSpace=value;} } /// <summary>  /// 获取或设置水印在修改图片中距底部的高度 /// </summary> public int BottoamSpace { get{return this.bottoamSpace;} set{this.bottoamSpace=value;} } /// <summary> /// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比 /// </summary> public int LucencyPercent { get{return this.lucencyPercent;} set { if(value>=0&&value<=100) this.lucencyPercent=value; } } /// <summary> /// 获取或设置要输出图像的路径 /// </summary> public string OutPath { get{return this.outPath;} set{this.outPath=value;}  }  #endregion  #region 开始绘制水印 DrawImage  /// <summary> /// 开始绘制水印 /// </summary>  /// <example>  /// <code>  ///  Watermark wm = new Watermark();  ///  wm.DrawedImagePath= Server.MapPath("") + "/upfile/" + "backlogo.gif";  ///  wm.ModifyImagePath=path;   ///  wm.RightSpace=184;  ///  wm.BottoamSpace=81;  ///  wm.LucencyPercent=50;  ///  wm.OutPath=Server.MapPath("") + "/upfile/" + fileName + "_new" + extension;  ///  wm.DrawImage();  ///    ///  //保存加水印过后的图片,删除原始图片   ///  mFileName=fileName + "_new" + extension;  ///  if(File.Exists(path)) { File.Delete(path); }   /// </code>  /// </example> public void DrawImage() { Image modifyImage=null; Image drawedImage=null; Graphics g=null; try {  modifyImage=Image.FromFile(this.ModifyImagePath);//建立图形对象 drawedImage=Image.FromFile(this.DrawedImagePath); g=Graphics.FromImage(modifyImage);  int x=modifyImage.Width-this.rightSpace;//获取要绘制图形坐标 int y=modifyImage.Height-this.BottoamSpace;  float[][] matrixItems ={//设置颜色矩阵   new float[] {1, 0, 0, 0, 0},   new float[] {0, 1, 0, 0, 0},   new float[] {0, 0, 1, 0, 0},   new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},   new float[] {0, 0, 0, 0, 1}};  ColorMatrix colorMatrix = new ColorMatrix(matrixItems); ImageAttributes imgAttr=new ImageAttributes(); imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap);  g.DrawImage(//绘制阴影图像  drawedImage,  new Rectangle(x,y,drawedImage.Width,drawedImage.Height),  0,0,drawedImage.Width,drawedImage.Height,  GraphicsUnit.Pixel,imgAttr);  string[] allowImageType={".jpg",".gif",".png",".bmp",".tiff",".wmf",".ico"};//保存文件 FileInfo file=new FileInfo(this.ModifyImagePath); ImageFormat imageType=ImageFormat.Gif; switch(file.Extension.ToLower()) {  case ".jpg": imageType=ImageFormat.Jpeg; break;  case ".gif": imageType=ImageFormat.Gif; break;  case ".png": imageType=ImageFormat.Png; break;  case ".bmp": imageType=ImageFormat.Bmp; break;  case ".tif": imageType=ImageFormat.Tiff; break;  case ".wmf": imageType=ImageFormat.Wmf; break;  case ".ico": imageType=ImageFormat.Icon; break;  default: break; } MemoryStream ms=new MemoryStream(); modifyImage.Save(ms,imageType); byte[] imgData=ms.ToArray(); modifyImage.Dispose(); drawedImage.Dispose(); g.Dispose(); FileStream fs=null; if(this.OutPath==null || this.OutPath=="") {  File.Delete(this.ModifyImagePath);  fs=new FileStream(this.ModifyImagePath,FileMode.Create,FileAccess.Write); } else {  fs=new FileStream(this.OutPath,FileMode.Create,FileAccess.Write); } if(fs!=null) {  fs.Write(imgData,0,imgData.Length);  fs.Close(); } } finally { try {  drawedImage.Dispose();  modifyImage.Dispose();  g.Dispose(); } catch{} } }  #endregion }}