EF4.1 code首先复杂类型作为主键 [英] EF4.1 Code First Complex Type as primary key

问题描述

我目前正在实施的存储库我与实体框架4.1的RC和code第一种方法域对象。 现在我有一个域实体海角，它有封装类型VoyageNumber的唯一标识符

 公共类VoyageNumber
{
    私人只读串号;

    公共VoyageNumber（串号）
    {
        Validate.NotNull（数字，VoyageNumber需要）;

        this.number =号;
    }

    公共字符串ID
    {
        {返回数; }
    }
 

现在我得到一个异常，当我做到这一点我的DbContext的配置：

  modelBuilder.Entity＆LT;航程＆GT;（）HasKey＆LT; VoyageNumber＆GT;（K =＆GT; k.VoyageNumber）;
 

  

属性VoyageNumber不能   用作对实体关键属性   Domain.Model.Voyages.Voyage'，因为   物业类型不是有效的密钥   类型。只有标量类型，串并   byte []的支持的密钥类型。

和还当我尝试这样的：

  modelBuilder.Entity＆LT;航程＆GT;（）HasKey＆LT;字符串＆GT;（K =＆GT; k.VoyageNumber.Id）;
 

  

属性EX pression'K =>   k.VoyageNumber.Id'无效。该   EX pression应该重新present一个   属性：C＃：T => t.MyProperty

难道我真的有垃圾我VoyageNumber，并将其与原始类型替换？

解决方案

这是限制。键部件可以直接在实体是唯一标量属性。复杂类型是重新presented作为不被支持的复杂属性

I'm currently trying to implement the repositories for my domain objects with the RC of Entity Framework 4.1 and its code first approach. Now I have a domain entity "Voyage" which has a unique identifier encapsulated in the type "VoyageNumber"

public class VoyageNumber
{
    private readonly string number;

    public VoyageNumber(string number)
    {
        Validate.NotNull(number, "VoyageNumber is required");

        this.number = number;
    }

    public string Id
    {
        get { return number; }
    }

Now I get an exception when i do this in the configuration of my DbContext:

modelBuilder.Entity<Voyage>().HasKey<VoyageNumber>(k => k.VoyageNumber);

The property 'VoyageNumber' cannot be used as a key property on the entity 'Domain.Model.Voyages.Voyage' because the property type is not a valid key type. Only scalar types, string and byte[] are supported key types.

and also when I try this:

modelBuilder.Entity<Voyage>().HasKey<string>(k => k.VoyageNumber.Id);

The properties expression 'k => k.VoyageNumber.Id' is not valid. The expression should represent a property: C#: 't => t.MyProperty'

Do I really have to trash my VoyageNumber and replace it with a primitive type?

解决方案

This is the limitation. Key members can be only scalar properties directly in the entity. Complex type is represented as complex property which is not supported.

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