如何通过反射加载所有Entity Framework 4.1实体配置实体？ [英] How can I load all Entity Framework 4.1 entity configuration entities via reflection?

问题描述

在用于数据上下文的 OnModelCreating 方法中，我当前正在手动映射所有实体配置映射类，例如：

In my OnModelCreating method for my data context I currently am manually mapping all my entity configuration mapping classes manually, like:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Configurations.Add(new UserMap());
    // 20 or so mapping configuration below
}

我想简化通过使用反射，所以我有以下代码：

I want to streamline this by using reflection, so I have the following code:

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        // Find all EntityTypeConfiguration classes in the assembly
        foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
            foreach (Type t in asm.GetTypes())
                if (t.IsDerivedFromOpenGenericType(typeof(EntityTypeConfiguration<>)))
                    modelBuilder.Configurations.Add(Activator.CreateInstance(t));   
    }

IsDerivedFromOpenGenericType 是来自此问题并正常工作。

问题在于，由于 Activator.CreateInstance（t），因此无法编译返回对象，但是模型构建器期望使用 System.Data.Entity.ModelConfiguration.ComplexTypeConfiguration< TComplexType> 。

The problem is this doesn't compile because Activator.CreateInstance(t) returns an object, but the model builder is expecting a System.Data.Entity.ModelConfiguration.ComplexTypeConfiguration<TComplexType>.

通常在使用 Activator 类时，我只会将对象转换为我期望的类型 t 是（或我希望班级接受），但是由于这是使用泛型，所以我不知道这样做的方法。

Normally when using the Activator class I would just cast the object as whatever I expect type t to be (or what I expect the class to take), but since this is using a generics I don't know of a way to do that.

有人有什么想法吗？

推荐答案

我不确定为什么很难找到此信息（至少对我而言），但是有一种更简单的方法来进行详细操作此处。

I'm not sure why this information is so hard to find (at least it was for me), but there is a much simpler way to do it detailed here.

public class MyDbContext : DbContext
{
  protected override void OnModelCreating(DbModelBuilder modelBuilder)
  {
    modelBuilder.Configurations.AddFromAssembly(Assembly.GetAssembly(GetType())); //Current Assembly
    base.OnModelCreating(modelBuilder);
  }
}

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