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我有一个具有用户->角色关系的 EF 模型。这是我们数据库中的一对多关系。我想从角色记录中选择 ID，从用户记录中选择名称。我想出的方法适用于一对一的关系。我不确定如何在动态 linq 中生成一个列表。也许一个SelectMany？

用户表：用户

加入表：User_Role

角色表：角色

 //does not select inside a collection of USER_ROLES
 q= query.Select(" new ( ID, (new (USER_ROLES.ID as ID) as USER)")

 //not valid
 //q = query.Select(" new ( ID, (new List<Object> (USER_ROLES.ID as ID) as USER)")   something I figure this would give me a list of User_Role's ID

 //not valid
 //q = query.Select(" new ( ID, (new List<Object> (USER_ROLES.ROLE.ID as ID) as USER)")       something I figure this would give me a list of Role's ID

更新我越来越近了。我使用了一个selectman，但结果是重复的

q = query.SelectMany("USER_ROLES","new (inner as myUSER,outer as myROLE) ").SelectD("new (myROLE.ID as ROLE_ID, new( myROLE.NAME, myUSER.USER.FIRSTNAME,myUSER.USER.ID)as user)")

结果如下所示：

 Role->User_Role A-> User A
       User_Role A-> User B    ..notice the repeat of "User_Role A" 
       User_Role A-> User C

它应该是

     Role->User Role a -> User A
                         + User B
                         + User C
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