/// <summary>

    ///分页，使用offset,mssql2012以后有用
    /// </summary> 
    /// <param name="orderstr">如：yydate desc,yytime asc,id desc,必须形成唯一性</param>
    /// <param name="PageSize"></param>
    /// <param name="PageIndex"></param>
    /// <param name="strWhere"></param>
    /// <returns></returns>
    public List<Model.Blog> GetList(  string orderstr, int PageSize, int PageIndex, string strWhere)
    {
        if (!string.IsNullOrEmpty(strWhere))
        {
            strWhere = " where " + strWhere;
        }
        string sql = string.Format(
                "select * from [blog] {0} order by {1} offset {2} rows fetch next {3} rows only",  
                strWhere, 
                orderstr, 
                (PageIndex - 1) * PageSize,
                PageSize
            );
        List<Model.Blog> list = new List<Model.Blog>();
        using (var connection = ConnectionFactory.GetOpenConnection())
        {
            list = connection.Query<Model.Blog>(sql).ToList();
        }
        return list;
    }