Entity Framework底層操作封裝V2版本（7）

下面就是使用了：首先我們舉例沒有緩存的類的使用：同時也把多條件組合 lambda 的使用弄上來給大家看看

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using JFrame.AccessCommon;
using JFrame.Entity;
using JFrame.Utility;
using System.Linq.Expressions;

namespace JFrame.Dal
{
    public class SysOperateLogDal : DalBaseData<SysOperateLog>
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="PageInfo"></param>
        /// <param name="ErrorType"></param>
        /// <param name="ErrorContent"></param>
        /// <param name="StarTime"></param>
        /// <param name="EndTime"></param>
        /// <returns></returns>
        public List<SysOperateLog> GetSysOperateLog(PagingInfo PageInfo, string ErrorType, string ErrorContent, DateTime? StarTime, DateTime? EndTime)
        {
            Expression<Func<SysOperateLog, bool>> expression = PredicateExtensions.True<SysOperateLog>();
            expression = expression.And(o => 1 == 1);
            if (!string.IsNullOrEmpty(ErrorType)) 
            {
                expression = expression.And(o => o.OType == ErrorType);
            }
            if (!string.IsNullOrEmpty(ErrorContent))
            {
                expression = expression.And(o => o.OContent.Contains(ErrorContent));
            }
            if (StarTime!=null)
            {
                expression = expression.And(o => o.ODate > StarTime);
            }
            if (EndTime != null)
            {
                expression = expression.And(o => o.ODate < EndTime);
            }
            return GetAllEntityByPage(expression, PageInfo, p => p.LogId);
        }
    }
}

下面是需要進行數據緩存的類的實例：角色是需要經常用到的，每個用戶登錄以後，都需要不斷的去去讀這部分數據，判斷用戶所有使用功能的權限。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using JFrame.Entity;

namespace JFrame.Dal
{
    public class SysRolesDal : DalBaseDataCache<SysRoles>
    {
        public List<SysRoles> GetUserRoles(int UserId) 
        {
            int?[] SysRoleMenu = (from myTabe in new DalBaseDataCache<SysUserAndRoles>().GetListByWhere(p => p.UBaseId == UserId)
                                  select myTabe.RoleId).ToArray();
            return GetListByWhere(p => SysRoleMenu.Contains(p.RoleId));
        }
    }
}