C# EntityFramework(.NET Core)由多个条件左外部联接
我需要通过以下几个条件匹配C# EntityFramework(.NET Core)由多个条件左外部联接,c#,sql,entity-framework,.net-core,entity-framework-core,C#,Sql,Entity Framework,.net Core,Entity Framework Core,我需要通过以下几个条件匹配用户和用户操作,操作类型,已批准,并且仍然希望将查询保留为左外部联接,因为操作可能丢失。在常规.net实体框架中,我将执行以下操作: var q = from u in db.User join ua in db.UserActions on { u.Id, "Approved" } equals { ua.UserId, ua.ActionType } into actions from ua in action.DefaultIfEm
用户
和用户操作
,操作类型
,已批准
,并且仍然希望将查询保留为左外部联接
,因为操作可能丢失。在常规.net实体框架中,我将执行以下操作:
var q = from u in db.User
join ua in db.UserActions on { u.Id, "Approved" } equals { ua.UserId, ua.ActionType } into actions
from ua in action.DefaultIfEmpty()
where u.Active
select new { User = u, Actions = ua}
不幸的是,对于实体框架的核心版本,它不起作用。如何使用EF for.NET Core实现类似的目标?试试以下方法:
var q = from u in db.User
join ua in db.UserActions on new { UserId = u.Id, ActionType = "Approved" } equals new { ua.UserId, ua.ActionType } into actions
from ua in actions.DefaultIfEmpty()
where u.Active
select new { User = u, Actions = ua}
连接语法两侧的匿名类型的属性名需要匹配。您使用的是什么EF核心版本?收到了什么错误消息?