当首先相关 table 引用时一对一的 EF 迁移问题

Question

我在 Companies 和 CompanyDemographics 之间建立了 1:1 关系，如下所示：

public class Company
{
    public Company()
    {
        Contacts = new HashSet<Contact>();
    }

    [Key]
    public int CompanyId { get; set; }

    public string Name { get; set; }

    [ForeignKey("CompanyId")]
    public virtual CompanyDemographic Demographic { get; set; }

    public virtual ICollection<Contact> Contacts { get; set; }
}

public class CompanyDemographic
{
    [Key]
    [ForeignKey("Company")]
    public int CompanyId { get; set; }
    public virtual Company Company { get; set; }

    public int EmployeeCount { get; set; }
}

迁移构建正确，一切正常。

然后我将 CompanyDemographic 的引用添加回 Company，如下所示：

public class CompanyDemographic
{
    [Key]
    [ForeignKey("Company")]
    public int CompanyId { get; set; }
    public virtual Company Company { get; set; }

    public int EmployeeCount { get; set; }

    // ADDING THIS
    [ForeignKey("CurrentProvider")]
    public int CurrentProviderCompanyId { get; set; }
    public virtual Company CurrentProvider { get; set; }
}

当我去添加迁移时，它看起来像这样：

public override void Up()
{
    DropForeignKey("dbo.Contacts", "CompanyId", "dbo.Companies");
    DropForeignKey("dbo.CompanyDemographics", "CompanyId", "dbo.Companies");
    DropPrimaryKey("dbo.Companies");
    AddColumn("dbo.CompanyDemographics", "CurrentProviderCompanyId", c => c.Int(nullable: false));
    AlterColumn("dbo.Companies", "CompanyId", c => c.Int(nullable: false));
    AddPrimaryKey("dbo.Companies", "CompanyId");
    CreateIndex("dbo.Companies", "CompanyId");
    CreateIndex("dbo.CompanyDemographics", "CurrentProviderCompanyId");
    AddForeignKey("dbo.CompanyDemographics", "CurrentProviderCompanyId", "dbo.Companies", "CompanyId", cascadeDelete: true);
    AddForeignKey("dbo.Contacts", "CompanyId", "dbo.Companies", "CompanyId", cascadeDelete: true);
    AddForeignKey("dbo.CompanyDemographics", "CompanyId", "dbo.Companies", "CompanyId");
}

它正在尝试删除所有密钥并重建。我该如何避免这种情况？

Answer 1

将@Steve Greene 评论转换为答案：

将 [InverseAttribute("Company")] 放在公司的人口统计属性上（而不是外键）解决了这个问题！

[InverseAttribute("Company")]
public virtual CompanyDemographic Demographic { get; set; }

当首先相关 table 引用时一对一的 EF 迁移问题

EF migration issue on one-to-one when related table references first

c#

entity-framework

entity-framework-migrations

entity-framework-6