C#遍历目录下的文件和子目录

        //打开目录
        private void BtnClickOpenDirPics(object sender, EventArgs e)
        {
            FolderBrowserDialog DirPics = new FolderBrowserDialog();
            DirPics.SelectedPath = "D:\\";

            if (DirPics.ShowDialog() == DialogResult.OK)
            {
                string FolderPathName = DirPics.SelectedPath;
                DirectoryInfo DiFolder = new DirectoryInfo(FolderPathName);
                ArrayList Lfiles = new ArrayList();
                GetAll(DiFolder, ref Lfiles);
            }
        }

        private void GetAll(DirectoryInfo dir, ref ArrayList FileList)//搜索文件夹中的文件
        {
            FileInfo[] allFile = dir.GetFiles();
            foreach (FileInfo fi in allFile)
            {
                FileList.Add(fi.FullName);
            }

            DirectoryInfo[] allDir = dir.GetDirectories();
            foreach (DirectoryInfo d in allDir)
            {
                GetAll(d, ref FileList);
            }
        }