在单独的项目不能使用DbModelBuilder [英] Cannot use DbModelBuilder in separate project

问题描述

在我的解决方案，我有几个项目，一个Web应用程序的共同组成部分。

In my solution, I have a few projects, all together forming part of one web application.

我忙设立实体框架，并在我的上下文类，而不必写在我所有的流利的API code中的

I am busy setting up Entity Framework, and in my context class, instead of having to write all my fluent API code in the

protected override void OnModelCreating(DbModelBuilder modelBuilder) 

方法，我希望能够在我的名为模式类来创建一个方法 ConfigureModel ，然后配置所有主键/外键设置在那里，所以它看起来应该如下：

method, I want to be able to create a method in my Model classes called ConfigureModel, and then configure all the primary key/foreign key settings there, so it should look something as follow:

public class UserRolesModel : ModelBase
{
    #region Configuration

    public static void ConfigureModel(DbModelBuilder modelBuilder)
    {
        //necessary code here
    }

    #endregion
}

和，例如，调用方法如下：

And, for example, call the method as follow:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    UserRolesModel.ConfigureModel(modelBuilder);
}

我现在面临的问题是在我的 ConfigureModel 方法：我似乎无法解析 DbModelBuilder 引用。即使我添加了 System.Data.Entity的 DLL我的引用，它没有工作。我需要实体框架安装到这个单独的项目，以及为这个工作。

The problem I am facing is in my ConfigureModel method: I cannot seem to resolve the DbModelBuilder reference. Even if I added the System.Data.Entity dll to my references, it did not work. I needed to install Entity Framework to this separate project as well for this to work.

当然，我没有EF添加到每个项目，我想使用 DbModelBuilder 吗？

Surely I do not have to add EF to every project I would like to use the DbModelBuilder in?

什么是实现这一目标的另一种方式？

What is another way of achieving this?

感谢

推荐答案

下面是我的2美分既然你问。不要把流利code在你的模型 - 这是关注和杂波它们（非POCO）不良分离。一个很好的替代巨人OnModelCreating是这样的：

Here's my 2 cents since you asked. Don't put fluent code in your models - that's bad separation of concerns and clutters them up (non-POCO). A good alternative to a giant OnModelCreating is this:

1）请在您的项目有上下文称为EntityConfigurations的文件夹。在一个大的项目，你可以把它连起来像进一步EntityConfigurations \\ SYSTEM，EntityConfigurations \\员工等。<一个href=\"http://odeto$c$c.com/blogs/scott/archive/2011/11/28/composing-entity-framework-fluent-configurations.aspx\"相对=nofollow>从斯科特 - 阿伦

1) Make a folder in your project that has your context called "EntityConfigurations". In a large project you could divide it up even further like "EntityConfigurations\System", "EntityConfigurations\Employee", etc. From Scott Allen

2）添加类为每个项目：

2) Add classes for each item:

public class ProductConfiguration : EntityTypeConfiguration<Product>
{
    public ProductConfiguration()
    {
        HasKey(p => p.ProductId);
        Property(p => p.ProductName)
           .IsRequired()
           .HasMaxLength(200);
        ...
    }

}

3）使用AddFromAssembly你的映射类将被发现并自动运行。 朱莉·勒曼。

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);
    Configuration.LazyLoadingEnabled = false;

    modelBuilder.Configurations.AddFromAssembly(Assembly.GetExecutingAssembly());
}

这为我们的团队运作良好。你几乎看以往的流畅code因此保持它我们看一下每天的模式是个好东西。

This has worked well for our team. You hardly ever look at the fluent code so keeping it out of the model we look at daily is a good thing.

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