图片处理类

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/*****************************************************************  * 创建人：sunwugang  * 主要作用：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   *  创建日期：2018-07-27  *****************************************************************/ namespace KK.TriageSys.Helper {     using System;     using System.Drawing;     using System.Drawing.Imaging;       public class ImageHelper     {         private static ImageHelper instance;         public static ImageHelper Instance         {             get             {                 if (instance == null) instance = new ImageHelper();                 return ImageHelper.instance;             }         }           //图片宽         private int ImageWidth;         /// <summary>         /// 图片高         /// </summary>         private int ImageHeight;           /// <summary>           /// 根据文件路径获取图片对象           /// </summary>           /// <param name="ImageFileName">图片文件的全路径名称</param>           public Image GetImageByPath(string ImageFileName)         {             return Image.FromFile(ImageFileName);         }           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="img">图片对象</param>           /// <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 Image GetReducedImage(Image img,int Width, int Height)         {             try             {                 Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);                 return img.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);             }             catch (Exception ex)             {                 LogHelper.Default.SaveText("ImageHelper  GetReducedImage:" + ex.Message + ex.StackTrace);                 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="img">图片对象</param>           /// <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(Image img, int Width, int Height, string targetFilePath)         {             try             {                 Image ReducedImage;                 Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);                 ReducedImage = img.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);                 ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);                 ReducedImage.Dispose();                 return true;             }             catch (Exception ex)             {                 LogHelper.Default.SaveText("ImageHelper  GetReducedImage:" + ex.Message + ex.StackTrace);                 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="img">图片对象</param>           /// <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 Image GetReducedImage(Image img, double Percent)         {             try             {                 Image ReducedImage;                 Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);                 ImageWidth = Convert.ToInt32(img.Width * Percent);                 ImageHeight = Convert.ToInt32(img.Width * Percent);                 ReducedImage = img.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);                 return ReducedImage;             }             catch (Exception ex)             {                 LogHelper.Default.SaveText("ImageHelper  GetReducedImage:" + ex.Message + ex.StackTrace);                 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="img">图片对象</param>           /// <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(Image img, double Percent, string targetFilePath)         {             try             {                 Image ReducedImage;                 Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);                 ImageWidth = Convert.ToInt32(img.Width * Percent);                 ImageHeight = Convert.ToInt32(img.Width * Percent);                 ReducedImage = img.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);                 ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);                 ReducedImage.Dispose();                 return true;             }             catch (Exception ex)             {                 LogHelper.Default.SaveText("ImageHelper  GetReducedImage:" + ex.Message + ex.StackTrace);                 return false;             }         }       } }