C# 批量转换图片格式

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;
namespace PictureBatchConversion
{
    public partial class Frm_Main : Form
    {
        public Frm_Main（）
        {
            InitializeComponent（）;
        }

        string[] path1=null;                 //用于存储选择的文件列表
        string path2=““;                    //用于存储保存的路径
        Bitmap bt;                          //声明一个转换图片格式的Bitmap对象
        Thread td;                          //声明一个线程
        int Imgtype1;                       //声明一个变量用于标记ConvertImage方法中转换的类型
        string OlePath;                     //声明一个变量用于存储ConvertImage方法中原始图片的

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2011-12-22 23:11  PictureBatchConversion\
     文件         956  2013-05-22 22:25  PictureBatchConversion.sln
     文件       16384  2010-11-04 01:50  PictureBatchConversion.suo
     目录           0  2011-12-22 23:11  PictureBatchConversion\bin\
     目录           0  2013-05-22 22:25  PictureBatchConversion\bin\Debug\
     文件       34816  2013-05-22 22:25  PictureBatchConversion\bin\Debug\PictureBatchConversion.exe
     文件       32256  2013-05-22 22:25  PictureBatchConversion\bin\Debug\PictureBatchConversion.pdb
     文件       12637  2010-07-08 22:01  PictureBatchConversion\Frm_Main.cs
     文件       17588  2010-07-08 22:01  PictureBatchConversion\Frm_Main.Designer.cs
     文件       10337  2010-07-08 22:01  PictureBatchConversion\Frm_Main.resx
     目录           0  2011-12-22 23:11  PictureBatchConversion\obj\
     目录           0  2013-05-22 22:25  PictureBatchConversion\obj\Debug\
     文件        8881  2013-05-22 22:25  PictureBatchConversion\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件        7345  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.csproj.FileListAbsolute.txt
     文件        1114  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.csproj.GenerateResource.Cache
     文件        1757  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.csprojResolveAssemblyReference.cache
     文件       34816  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.exe
     文件        2825  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.Frm_Main.resources
     文件       32256  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.pdb
     文件       12883  2013-05-22 22:25  PictureBatchConversion\obj\Debug\PictureBatchConversion.Properties.Resources.resources
     目录           0  2011-12-22 23:11  PictureBatchConversion\obj\Debug\Refactor\
     目录           0  2013-05-22 22:25  PictureBatchConversion\obj\Debug\TempPE\
     文件        5632  2013-05-22 22:25  PictureBatchConversion\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll
     文件        4697  2013-05-22 22:25  PictureBatchConversion\PictureBatchConversion.csproj
     文件         506  2010-07-08 22:01  PictureBatchConversion\Program.cs
     目录           0  2011-12-22 23:11  PictureBatchConversion\Properties\
     文件        1404  2008-12-24 22:18  PictureBatchConversion\Properties\AssemblyInfo.cs
     文件        5162  2013-05-22 22:25  PictureBatchConversion\Properties\Resources.Designer.cs
     文件        7453  2008-09-20 22:12  PictureBatchConversion\Properties\Resources.resx
     文件        1122  2013-05-22 22:25  PictureBatchConversion\Properties\Settings.Designer.cs
     文件         249  2008-09-20 20:55  PictureBatchConversion\Properties\Settings.settings
............此处省略9个文件信息