一个接口进一步抽象的实例

public interface IGenericManager<T> where T:class
    {
       /// <summary>
       ///  信息详细
       /// </summary>
       /// <param name="id"></param>
       /// <returns></returns>
       T GetInfo(string id);

       /// <summary>
       /// 信息列表
       /// </summary>
       /// <param name="id"></param>
       /// <returns></returns>
       List<T> GetList(string id);
       /// <summary>
       /// 信息列表
       /// </summary>
       /// <param name="id"></param>
       /// <param name="Count"></param>
       /// <returns></returns>
       List<T> GetList(string id, int Count);
       /// <summary>
       ///  信息列表（分页）
       /// </summary>
       /// <param name="id"></param>
       /// <param name="PageSize"></param>
       /// <param name="PageNumber"></param>
       /// <param name="Count"></param>
       /// <returns></returns>
       List<T> GetList(string id, Int32 PageSize, int PageNumber, out int Count);
    }

    /// <summary>
    ///  网站新闻
    /// </summary>
    public interface ISchoolNewsManage : IGenericManager<SchoolNewsDAL>
    {
        List<SchoolNewsDAL> GetImgList(string Schoolid);
    }

 /// <summary>
    ///  网站通知
    /// </summary>
   public interface ISchoolNoticeManage:IGenericManager<SchoolNoticeDAL>
    {
     
    }