Question

这是我的SQL查询：

SELECT
  UserName,
  IsApproved
FROM aspnet_Users u
INNER JOIN aspnet_Membership m
  ON u.UserId = m.UserId

有人可以帮我解释如何使用lambda表达式编写吗？

Answer 1

from u in aspnet_Users 
join m in aspnet_Membership on u.UserId equals m.UserId
select new { u.UserName, m.IsApproved };

Answer 2

试试这个..

from u in context.aspnet_Users 
join m in context.aspnet_Membership on u.UserId equals m.UserId select new { u.UserName, m.IsApproved};

Answer 3

您可以将JOIN与Lambda Expression一起使用，例如

var result = aspnet_Users
                .Join(aspnet_Membership, 
                u => u.UserId, 
                m => m.UserId, 
                (u, m) => new
             {
                UserName = u.UserName,
                IsApproved = u.IsApproved
             }
            );

Answer 4

这个查询怎么样：

选择UserName，IsApproved 来自aspnet_Users你 u.UserId = m.UserId上的内连接aspnet_Membership m 其中u.UserName = @UserName

在这种情况下，何处放置“where”？ @UserName是我定义的字符串参数 public ActionResult UserActivation（string UserName） { ... }

如何将SQL查询转换为Lambda表达式

4 个答案: