Question

在我的模型中，我有两个对象：Lead和Work。 Lead 可能有相关的Work，但Work 必须有相关的Lead。如何使用EF Code First和Fluent API正确表达这一点？到目前为止，我大部分时间都在试图这样做，但我无处可去。问题（可能？），是我需要在关系的两边都有导航属性。以下是我到目前为止配置对象的方法：

public class Lead {
    public int Id { get; set; }
    public int? WorkId { get; set; }
    public virtual Work Work { get; set; }
}

public class Work {
    public int Id { get; set; }
    //public int LeadId { get; set; } <- I think this is necessary?
    public virtual Lead Lead { get; set; }
}

// this seems to make a one-to-one relationship, but it's setting
// the column references as the Id columns on both sides, so it's wrong...
// Also causes this exception:
// A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'Id'.
this.HasOptional(t => t.Work).WithRequired(t => t.Lead);

尝试对测试数据库进行反向工程会产生一对多的关系，这不是我想要的。我很欣赏有关如何正确配置关系的建议。

Answer 1

如果lead是一个主体（Lead必须首先存在），那么这些类可能看起来像这样。

public class Lead {
    public int Id { get; set; }
    public virtual Work Work { get; set; }
}

public class Work {
    [Key, ForeignKey("Lead")]
    public int Id { get; set; }
    public virtual Lead Lead { get; set; }
}

如何在两端正确创建具有导航属性的EF One-to-Zero-One关系？

1 个答案: