CourseBLL/GradeManager.cs

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using System;
using System.Collections.Generic;
using System.Text;
using Course.Models;
using Course.DAL;

namespace Course.BLL
{
   public class GradeManager
    {
       GradeService gradeService = new GradeService();
       /// <summary>
       /// 获取所有的年级信息
       /// </summary>
       /// <returns></returns>
       public List<Grade> GetAllGrade()
       {
           return gradeService.GetAllGrade();
       }
        /// <summary>
        /// 根据年级 ID 获得年级名称
        /// </summary>
        /// <param name="gradeId"></param>
        /// <returns></returns>
       public string GetGradeNameByGradeId(int gradeId)
       {
           return gradeService.GetGradeNameByGradeId(gradeId);
       }
       /// <summary>
        /// 通过年级名称得到 Grade
        /// </summary>
        /// <param name="gradeName">年级名称</param>
        /// <returns></returns>
       public Grade GetGradeByGradeName(string gradeName)
       {
           return gradeService.GetGradeByGradeName(gradeName);
       }
    }
}