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linq to sql查询中返回linq自动建立的实体类型)

2011-12-03 11:39 597 查看
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///
/// UserBases扩展类,只在返回实体时用
///
public class User_BasesExt : User_Bases { }

///
/// (LINQ) UserBases分部类扩展
///
public partial class User_Bases : IEntity
{
///
/// 用户详细信息
///
public UserInfos UserInfos_Extend { get; set; }
///
/// 用戶地址实体
///
public IQueryable UserAddress_Extend { get; set; }

public UserAddress UserAddress { get; set; }
///
/// 统一主键
///
public object[] PrimaryKey
{
get { return new object[] { this.UserID }; }
}
}

下面代码将实现返回linq自动建立的实体(默认情况下,linq不支持这样建立)
public IQueryable GetDetailModel()
{
IQueryable linq1 = from data in new Repository().GetModel()
select new UserAddress_Ext
{
UserID = data.UserID,
ID = data.ID,
Address = data.Address,
};
var linq = from data in LoadRepository().GetModel()
join data2 in LoadRepository().GetModel() on data.UserID equals data2.UserID
let list = linq1.Where(i => i.UserID == data.UserID)
select new User_BasesExt
{
UserID = data.UserID,
UserName = data.UserName,
CreateDate = data.CreateDate,
Email = data.Email,
Status = data.Status,
UpdateDate = data.UpdateDate,
UserInfos_Extend = data2,
UserAddress_Extend = list,
};

return linq;
}
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