在system.iO；命名空间中提供了两种遍历枚举文件夹的类，Directory 和DirectoryInfo，

他们都有一个方法GetDirectories()；来便利枚举文件夹，

        /// <summary>

        /// 遍历根目录 ，获取专业名称

        /// </summary>

        /// <returns></returns>

        public DataTable GetYearName(string path)

        {

            //string strYear = "";

            DataTable tbYear = new DataTable("年份表");

            string[] arrPath = Directory.GetDirectories(path);

            //添加表头

            tbYear.Columns.Add("id");

            tbYear.Columns.Add("year_url");

            tbYear.Columns.Add("year_name");

            for (int i = 0; i < arrPath.Length / 2; i++)

            {

                string temp = arrPath[i];

                arrPath[i] = arrPath[arrPath.Length - 1 - i];

                arrPath[arrPath.Length - 1 - i] = temp;

            }

            for (int i = 0; i < arrPath.Length; i++)

            {

                string[] arrSplit = arrPath[i].ToString().Split('\\');

                tbYear.Rows.Add(new object[] { i, arrPath[i], arrSplit[arrSplit.Length - 1] });

            }

            return tbYear;

        }

        /// <summary>

        /// 遍历根目录 ，获取专业名称

        /// </summary>

        /// <returns></returns>

        public DataTable GetMajorName(string path)

        {

            DataTable tbMajor = new DataTable("专业表");

            string[] arrPath = Directory.GetDirectories(path);

            //添加表头

            tbMajor.Columns.Add("major_id");

            tbMajor.Columns.Add("major_url");

            tbMajor.Columns.Add("major_name");

            for (int i = 0; i < arrPath.Length; i++)

            {

                string[] arrSplit = arrPath[i].ToString().Split('\\');

                tbMajor.Rows.Add(new object[] { i, arrPath[i], arrSplit[arrSplit.Length - 1] });

            }

            return tbMajor;

            //string strMajor = "";

            //DataTable tbMajor = new DataTable("专业表");

            //tbMajor.Columns.Add("major_name");

            //DirectoryInfo theDepInfo = new DirectoryInfo(path);

            //foreach (DirectoryInfo folder in theDepInfo.GetDirectories())

            //{

            //    strMajor += folder.Name + ",";

            //    tbMajor.Rows.Add(folder.Name);

            //}

            //return tbMajor;

        }

        /// <summary>

        ///  获取专业文件夹下班级名称

        /// </summary>

        /// <param name="majorName">专业名称</param>

        /// <returns></returns>

        public DataTable GetClassName(string path)

        {

            DataTable tbClasses = new DataTable("班级表");

            string[] arrPath = Directory.GetDirectories(path);

            //添加表头

            tbClasses.Columns.Add("class_id");

            tbClasses.Columns.Add("class_url");

            tbClasses.Columns.Add("class_name");

            for (int i = 0; i < arrPath.Length; i++)

            {

                string[] arrSplit = arrPath[i].ToString().Split('\\');

                tbClasses.Rows.Add(new object[] { i, arrPath[i], arrSplit[arrSplit.Length - 1] });

            }

            return tbClasses;

        }

        /// <summary>

        /// 获取班级文件夹下班级名称

        /// </summary>

        /// <param name="majorName">专业名称</param>

        /// <returns></returns>

        public DataTable GetStudentName(string path)

        {

            DataTable tbStudents = new DataTable("学生信息表");

            string[] arrPath = Directory.GetDirectories(path);

            //添加表头

            tbStudents.Columns.Add("_id");

            tbStudents.Columns.Add("student_url");

            tbStudents.Columns.Add("name");

            tbStudents.Columns.Add("student_num");

            tbStudents.Columns.Add("student_name");

            tbStudents.Columns.Add("teacher");

            tbStudents.Columns.Add("select_topic");

            for (int i = 0; i < arrPath.Length; i++)

            {

                string[] arrSplit = arrPath[i].ToString().Split('\\');

                string name = arrSplit[arrSplit.Length - 1];

                if(name.Length<=0)

                {

                    continue;

                }

                string []arrInfo=name.Split(new char[]{'_','-'});

                if (arrInfo.Length < 4)

                {

                    continue;

                }

                tbStudents.Rows.Add(new object[] { i, arrPath[i], name,arrInfo[0],arrInfo[1],arrInfo[2],arrInfo[3]});

            }

            return tbStudents;

        }

下面是使用了foreach，上面的看起来比较笨，但是专业性会更好一点

 /// <summary>

        ///  获取专业文件夹下班级名称

        /// </summary>

        /// <param name="majorName">专业名称</param>

        /// <returns></returns>

       public DataTable GetClasses(string path,string majorName)

        {

           string strClasses = "";

           DataTable tbClasses = new DataTable("班级表");

           tbClasses.Columns.Add("class_name");

           DirectoryInfo theDepInfo = new DirectoryInfo(rootDirectoryUrl);

           foreach (DirectoryInfo folder in theDepInfo.GetDirectories())

           {

               strClasses += folder.Name + ",";

               tbClasses.Rows.Add(new object[] { folder.Name });

           }

           return tbClasses;

       }