[置顶] c#对于文件的操作

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;
       }