一对一的关系，实体框架 [英] One-to-one relationship, entity framework

问题描述

我想在路线和难度级别之间建立一对一的关系（简单，坚硬）



我有这些模型：

I want a one-to-one relationship, between route and difficult level(simple, hard)

I have these models:

public class Route
    {

        [Key]
        public int routeID { get; set; }
        public string Name { get; set; }

        public int? UserProfileID { get; set; }
        public int? CountryID { get; set; }
        //public int? DifficultGradeID { get; set; }



        public virtual UserProfile userProfile { get; set; }
        public virtual Country country { get; set; }
        public virtual Difficult difficult { get; set; }
    }



public class Difficult
    {
        [Key, ForeignKey("Route")]
        public int routeID { get; set; }
        public string DifficultName { get; set; }

        public virtual Route route { get; set; }

    }

但每次我做Update-Databse时，都会收到此错误：

but every time I do Update-Databse, I get this error:

Quote：

类型'ContosoUniversity'属性'routeID'上的ForeignKeyAttribute .Models.Difficult'无效。在依赖类型'ContosoUniversity.Models.Difficult'上找不到导航属性'Route'。 Name值应该是有效的导航属性名称。

The ForeignKeyAttribute on property 'routeID' on type 'ContosoUniversity.Models.Difficult' is not valid. The navigation property 'Route' was not found on the dependent type 'ContosoUniversity.Models.Difficult'. The Name value should be a valid navigation property name.

谢谢

Thank you

推荐答案

您只需要使外键名称与导航属性匹配。

在外键中，您使用了 R oute，导航属性为 r oute

所以改变这个：

You just need to make the foreign key name match the navigation property.
In the foreign key, you have used "Route", and the navigation property is "route"
So change this:

[Key, ForeignKey("Route")]

到此：

to this:

[Key, ForeignKey("route")]

您应该排序。

And you should be sorted.

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