随笔分类 -  Entity Framework

Entity Framework6
Linq To SQL LEFT OUTER JOIN (Left Join)
摘要：SQL:SELECT [t0].[ProductName], [t1].[TotalPrice] AS [TotalPrice]FROM [Product] AS [t0]LEFT OUTER JOIN [OrderDetail] AS [t1] ON [t0].[ProductID] = [t1]... 阅读全文
posted @ 2015-07-02 19:57 dldg 阅读(538) 评论(0) 推荐(0)
ling join 报错The specified LINQ expression contains references to queries that are associated with different cont
摘要：The specified LINQ expression contains references to queries that are associated with different cont。解决方法：查询源的最后添加.ToList();一定是哪里转换成了IEnumerable或其他东东了... 阅读全文
posted @ 2015-06-03 10:41 dldg 阅读(1376) 评论(0) 推荐(0)
DatabaseGenerated(转)
摘要：在EF中，我们建立数据模型的时候，可以给属性配置数据生成选项DatabaseGenerated，它后有三个枚举值：Identity、None和Computed。Identity：自增长None：不处理Computed：表示这一列是计算列。在EF中，如果主键是int类型，Code First生成数据库... 阅读全文
posted @ 2014-12-29 09:53 dldg 阅读(561) 评论(0) 推荐(0)