public class LhaUtity     {         ///取得DLL的版本         [DllImport("unlha32")]         private static extern UInt16 UnlhaGetVersion();         /// <summary>         /// '取得DLL的执行情况         /// </summary>         /// <returns>是否成功</returns>         [DllImport("unlha32")]         private static extern  Boolean UnlhaGetRunning();         /// <summary>         /// '文件检查         /// </summary>         /// <param name="szFileName"></param>         /// <param name="iMode"></param>         /// <returns></returns>         [DllImport("unlha32")]         private static extern Boolean UnlhaCheckArchive(String szFileName, Int32 iMode);         /// <summary>         /// 文件解压缩         /// </summary>         /// <param name="hwnd"></param>         /// <param name="szCmdLine"></param>         /// <param name="szOutput"></param>         /// <param name="dwSize"></param>         /// <returns></returns>         [DllImport("unlha32")]         private static extern int Unlha(int hwnd, string szCmdLine, string szOutput, int dwSize);         /// <summary>         /// 需要解压的文件         /// </summary>         /// <param name="archiveFile">解压文件路径</param>         /// <param name="extractDir">解压到路径</param>         /// <param name="isDeleteFile">是否删除</param>         public static bool UnCompress(string archiveFile, string extractDir,bool  isDeleteFile)         {             string extractFullPath = string.Empty;             string startPath = AppDomain.CurrentDomain.BaseDirectory;             if (!System.IO.File.Exists(archiveFile))             {                 //判断需要解压的文件存不存                 throw new Exception(string.Format("需要解压的{0}不存在", archiveFile));             }             try             {                 UInt16 ver = LhaUtity.UnlhaGetVersion();             }             catch (Exception ex)             {                 throw new Exception("没找到Unlha32.dll文件");             }             if (UnlhaGetRunning())             {                 throw new Exception("DLL正在执行");             }             if (!UnlhaCheckArchive(archiveFile, 0))             {                 throw new Exception("文件不能被解压缩");             }             //解压的路径             if (string.IsNullOrEmpty(extractDir))             {                 extractFullPath =string.Format(@"{0}{1}\", startPath,archiveFile.Substring(archiveFile.LastIndexOf("\\")+1,archiveFile.IndexOf(".lha")-1-archiveFile.LastIndexOf("\\")));             }             else             {                 extractFullPath = extractDir;             }             if (!System.IO.Directory.Exists(extractFullPath))             {                 System.IO.Directory.CreateDirectory(extractFullPath);             }                            int ret = Unlha(0, string.Format("x \"{0}\" \"{1}\"", archiveFile, extractFullPath), null, 0);             if (ret != 0)             {                 if (ret == 32800)                 {                     throw new Exception("文件解压缩取消");                 }                 else                 {                     throw new Exception("文件解压缩异常结束");                 }             }             else             {                 if (isDeleteFile)                 {                     System.IO.File.Delete(archiveFile);                 }                 return true;             }         } }