实体框架1到1的设置关系 [英] setup relation for 1 to 1 with entity framework

问题描述

如何设置ContactId的建模工具？

How do I have to setup the modelbuilder for the ContactId?

CountryCompanyAssignment与联系人有关系。

A CountryCompanyAssignment has a relation to a Contact.

当我删除CountryCompanyAssignment时，我不想让联系人丢失。

When I delete the CountryCompanyAssignment I do not want that the contact is lost.

当我创建CountryCompanyAssignment时，我还需要一个联系人来保存CountryCompanyAssignment。

When I create a CountryCompanyAssignment then I also need a contact to save the CountryCompanyAssignment.

我需要设置CountryCompanyAssignment和ContactId之间的关系，因为当我删除CountryCompanyAssignment时，我收到一个错误，说我应该为联系人添加一个外键，使其工作

I need to setup the relation between CountryCompanyAssignment and the ContactId because when I delete the CountryCompanyAssignment I get an error saying I should add a foreign key for the Contact to make it work.

这是我试过的：

 modelBuilder.Entity<CountryCompanyAssignment>().HasRequired(e => e.Contact).WithRequiredDependent(e => e.);

 [Key]
        [Column(Order = 1)]
        public int Id { get; set; }

        [Key]
        [Column(Order = 1)]
        public string ContactId { get; set; }

        [Required]
        public string Test{ get; set; }

        [Required]
        public virtual Contact Contact { get; set; }

推荐答案

如果您使用WithRequired，必须是FK：

if you use a WithRequired, one of the PK must be a FK:

• Contact.Id如果WihtRequiredPrincipal


• Company.Id如果WithRequiredDependent
• 
  

• Contact.Id if WihtRequiredPrincipal
• Company.Id if WithRequiredDependent

如果您想要公开并选择您必须的fk：

if you want to expose and choose the fk you must:

modelBuilder.Entity<Company>().HasRequired(x => x.Contact). WithMany().HasForeignKey(y => y.ContactId);

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