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代码如下

using System;  using System.Data;  using System.Configuration;  using System.Web;  using System.Web.Security;  using System.Web.UI;  using System.Web.UI.WebControls;  using System.Web.UI.WebControls.WebParts;  using System.Web.UI.HtmlControls;  using System.IO;  using System.Drawing;  using System.Drawing.Imaging;  /// <summary>  /// 图片处理类  /// 1、生成缩略图片或按照比例改变图片的大小和画质  /// 2、将生成的缩略图放到指定的目录下  /// </summary>  public class ImageClass  {  public System.Drawing.Image ResourceImage;  private int ImageWidth;  private int ImageHeight;  public string ErrMessage;  /// <summary>  /// 类的构造函数  /// </summary>  /// <param name="ImageFileName">图片文件的全路径名称</param>  public ImageClass(string ImageFileName)  {  ResourceImage = System.Drawing.Image.FromFile(ImageFileName);  ErrMessage = "";  }  public bool ThumbnailCallback()  {  return false;  }  /// <summary>  /// 生成缩略图重载方法1，返回缩略图的Image对象  /// </summary>  /// <param name="Width">缩略图的宽度</param>  /// <param name="Height">缩略图的高度</param>  /// <returns>缩略图的Image对象</returns>  public System.Drawing.Image GetReducedImage(int Width, int Height)  {  try  {  System.Drawing.Image ReducedImage;  System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);  return ReducedImage;  }  catch (Exception e)  {  ErrMessage = e.Message;  return null;  }  }  /// <summary>  /// 生成缩略图重载方法2，将缩略图文件保存到指定的路径  /// </summary>  /// <param name="Width">缩略图的宽度</param>  /// <param name="Height">缩略图的高度</param>  /// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:Images ilename.jpg</param>  /// <returns>成功返回true，否则返回false</returns>  public bool GetReducedImage(int Width, int Height, string targetFilePath)  {  try  {  System.Drawing.Image ReducedImage;  System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);  ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);  ReducedImage.Dispose();  return true;  }  catch (Exception e)  {  ErrMessage = e.Message;  return false;  }  }  /// <summary>  /// 生成缩略图重载方法3，返回缩略图的Image对象  /// </summary>  /// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>  /// <returns>缩略图的Image对象</returns>  public System.Drawing.Image GetReducedImage(double Percent)  {  try  {  System.Drawing.Image ReducedImage;  System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);  ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);  ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);  return ReducedImage;  }  catch (Exception e)  {  ErrMessage = e.Message;  return null;  }  }  /// <summary>  /// 生成缩略图重载方法4，返回缩略图的Image对象  /// </summary>  /// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>  /// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:Images ilename.jpg</param>  /// <returns>成功返回true,否则返回false</returns>  public bool GetReducedImage(double Percent, string targetFilePath)  {  try  {  System.Drawing.Image ReducedImage;  System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);  ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);  ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);  ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);  ReducedImage.Dispose();  return true;  }  catch (Exception e)  {  ErrMessage = e.Message;  return false;  }  }  }  。

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