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[英]How to expose Foreign Key property to existing entity having navigational property using EF6 Code First
[英]EF Code First - How to add foreign key property when using InverseProperty?
我在下面定義了代碼優先模型。
Project和TeamMember之間存在兩種關系:
一對多-項目始終只有一個TeamMember作為經理。
public class Project { public Guid ProjectId { get; set; } [InverseProperty("ManagedProjects"), Required] public virtual TeamMember Manager { get; set; } // 2 public virtual List<TeamMember> TeamMembers { get; set; } // 1 } public class TeamMember { public Guid TeamMemberId { get; set; } public virtual List<Project> Projects { get; set; } // 1 [InverseProperty("Manager")] public virtual List<Project> ManagedProjects { get; set; } // 2 }
此模型生成如下所示的“項目”表定義。
CREATE TABLE [dbo].[Project] (
[ProjectId] UNIQUEIDENTIFIER NOT NULL,
[Manager_TeamMemberId] UNIQUEIDENTIFIER NOT NULL,
CONSTRAINT [PK_dbo.Project] PRIMARY KEY CLUSTERED ([ProjectId] ASC),
CONSTRAINT [FK_dbo.Project_dbo.TeamMember_Manager_TeamMemberId] FOREIGN KEY
([Manager_TeamMemberId]) REFERENCES [dbo].[TeamMember] ([TeamMemberId]));
我需要使用Manager的外鍵屬性來擴展Project,但無法確定要執行此操作。
public Guid ManagerId { get; set; } // 2
[InverseProperty("ManagedProjects")]
public virtual TeamMember Manager { get; set; } // 2
上面的代碼不起作用,因為它只是在Project表中生成一個ManagerId字段。 我嘗試了ForeignKey和InverseProperty的不同組合,但沒有任何運氣。
有什么建議么?
接下來的代碼應為多對多創建連接表,並且“ Project”表將在此表上具有外鍵。
public class Project
{
public Guid ProjectId { get; set; }
public virtual TeamMember Manager { get; set; } // 2
[InverseProperty("Projects")]
public virtual List<TeamMember> TeamMembers { get; set; } // 1
}
public class TeamMember
{
public Guid TeamMemberId { get; set; }
[InverseProperty("TeamMembers")]
public virtual List<Project> Projects { get; set; } // 1
[InverseProperty("Manager")]
public virtual List<Project> ManagedProjects { get; set; } // 2
}
我認為沒有連接表就不可能有多對多的關系。
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