关于图像格式转换的c#代码

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
//langyue_wu@163.com

namespace ImageConvert
{
    class ChangeImageClass
    {
        private string _dataPath;
        private string _savePath;
        private int _pathIndex;
        private string _fileExtension;
        private string _pixFormat;
        private float _ResolutionH;
        private float _ResolutionV;

        private int _fileCount;
        private int _fileInc;


        public delegate void ShowMessageHander（string strMessage）;
        public event ShowMessageHander ShowMessageEvent;

        public delegate void ShowExceptionHander（string strMessage）;
        public event ShowExceptionHander ShowExceptionEvent;

        public delegate void AfterWorkHander（）;
        public event AfterWorkHander AfterWorkEvent;

        public delegate void ShowProgressHander（int progressNum int totalNum）;
        public event ShowProgressHander ShowProgressEvent;

        public ChangeImageClass（string dataPath string savePath string fileExtension string pixFormat float ResolutionH float ResolutionV）
        {
            _dataPath = dataPath;
            _savePath = savePath;
            _fileExtension = fileExtension;
            _pixFormat = pixFormat;
            _ResolutionH = ResolutionH;
            _ResolutionV = ResolutionV;
        }

        public void MainProcess（）
        {
            try
            {
                DirectoryInfo dirParent = Directory.GetParent（_dataPath）;
                _pathIndex = dirParent.FullName.Length;
                _savePath = Path.Combine（_savePath _dataPath.Substring（_pathIndex）.TrimStart（‘\‘） + “转换后“）;
                _pathIndex = _dataPath.Length;
                DirectoryInfo dirInfo = new DirectoryInfo（_dataPath）;
                _fileCount = dirInfo.GetFiles（“*.*“ SearchOption.AllDirectories）.Length;
                ShowMessageEvent（string.Format（“总文件数：{0}“ _fileCount））;
                _fileInc = 0;
                ListFolder（dirInfo true）;
                ShowMessageEvent（string.Format（“处理文件数：{0}“ _fileInc））;
                AfterWorkEvent（）;
            }
            catch （Exception ee）
            {
                //盘符目录
                ShowExceptionEvent（string.Format（“【异常】{0}“ ee.Message））;
            }

        }

        /// 

        /// 递归目录
        /// 

        /// 文件信息
        /// 是否递归子项
        private void ListFolder（FileSystemInfo fileInfo bool getChildren）
        {

            if （!fileInfo.Exists） return;//如果文件不存在，返回
            DirectoryInfo dirInfo = fileInfo as DirectoryInfo;//转换成目录
            if （dirInfo == null） return;   //不是目录 
            if （getChildren）
            {
                DirectoryInfo[] dirs = dirInfo.G

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-09-12 20:26  ImageConvert
     目录           0  2013-09-12 20:36  ImageConvertImageConvert
     文件       10677  2013-09-12 20:54  ImageConvertImageConvertChangeImageClass.cs
     文件        7675  2013-09-12 20:30  ImageConvertImageConvertFormMain.cs
     文件       16753  2013-09-12 20:30  ImageConvertImageConvertFormMain.designer.cs
     文件      253360  2013-09-12 20:30  ImageConvertImageConvertFormMain.resx
     文件        5744  2013-09-12 20:36  ImageConvertImageConvertImageConvert.csproj
     文件         580  2012-12-12 00:58  ImageConvertImageConvertImageConvert.csproj.user
     文件         474  2011-04-16 11:51  ImageConvertImageConvertProgram.cs
     目录           0  2011-10-27 14:41  ImageConvertImageConvertProperties
     文件        1203  2013-09-12 20:53  ImageConvertImageConvertPropertiesAssemblyInfo.cs
     文件        2862  2012-12-12 00:58  ImageConvertImageConvertPropertiesResources.Designer.cs
     文件        5612  2011-04-16 11:50  ImageConvertImageConvertPropertiesResources.resx
     文件        1110  2012-12-12 00:58  ImageConvertImageConvertPropertiesSettings.Designer.cs
     文件         249  2011-04-16 11:50  ImageConvertImageConvertPropertiesSettings.settings
     目录           0  2013-09-12 21:47  ImageConvertImageConvertin
     文件     6447104  2011-04-16 11:50  ImageConvertImageConvertgdal18.dll
     文件      161862  2011-04-16 11:50  ImageConvertImageConvertiPulse.ico
     目录           0  2013-09-12 20:28  ImageConvertImageConvertlibs
     文件        7030  2011-04-16 11:50  ImageConvertImageConvertlibsFileProcessClass.cs
     文件      421200  2011-04-16 14:18  ImageConvertImageConvertmsvcp100.dll
     文件      770384  2011-04-16 12:06  ImageConvertImageConvertmsvcr100.dll
     目录           0  2011-10-27 14:41  ImageConvertImageConvertobj
     目录           0  2011-10-27 14:41  ImageConvertImageConvertobjDebug
     文件      162428  2011-04-16 11:51  ImageConvertImageConvertobjDebugImageConvert.FormMain.resources
     文件         180  2011-04-16 11:51  ImageConvertImageConvertobjDebugImageConvert.Properties.Resources.resources
     文件         845  2011-04-16 11:51  ImageConvertImageConvertobjDebugImageConvert.csproj.GenerateResource.Cache
     目录           0  2013-09-12 21:52  ImageConvertImageConvertobjDebugTempPE
     文件        2251  2011-06-27 09:41  ImageConvertImageConvertobjImageConvert.csproj.FileListAbsolute.txt
     目录           0  2013-09-12 20:47  ImageConvertImageConvertobjRelease
     文件         789  2013-09-12 20:29  ImageConvertImageConvertobjReleaseDesignTimeResolveAssemblyReferences.cache
............此处省略13个文件信息