我如何动态地注册具有Unity名称的泛型类？ [英] How can I dynamically register generic classes with a name with Unity?

问题描述

我有一个带有一个BaseClass的很多类（300+）的程序集，我想用一个接口注册一个泛型类。

I have an assembly with a lot of classes (300+) with a BaseClass and I want register a generic class with a interface.

如果要解析接口的一组对象，请按{名称}进行注册。
我想在 MainViewModel 中自动创建一个对象数组。

With unity you have to register by {Name} if you want to resolve an array of objects of the interface. I want an array of objects in the MainViewModel automatically.

有没有一种方法可以通过反射自动执行此操作？
有何建议？

Is there a way to automate this with reflection? Any suggestions?

示例（伪）：

Example (pseudo):

public class BaseClass
{
   public void doFoo();
}

public ClassNumber001 : BaseClass
{
}
public ClassNumber002 : BaseClass
{
}

public interface ISuperman
{
}

public class Superman : ISuperman where T : BaseClass
{
}

public MainViewModel(IEnumerable<ISuperman> lotsofSuperman)
{
}

举例来说：

Working example by hand:

container.RegisterType<ISuperman, Superman <ClassNumber001>>("ClassNumber001");
container.RegisterType<ISuperman, Superman <ClassNumber002>>("ClassNumber002");
container.RegisterType<IEnumerable<ISuperman>, ISuperman[]>();

推荐答案

是的，您需要使用反射轻松创建所有你想要的映射。由于您使用的是Unity 3，因此您可以利用按公约注册，以便在注册课程时提供帮助（更重的提升）。

Yes, you'll need to use reflection to easily create all of the mappings that you want. Since you are using Unity 3 you can take advantage of Registration by Convention to provide help (with the heavier lifting) in registering the classes.

我已将您的伪代码编译成实际的代码：

I've taken your pseudo code and translated it into real code:

public abstract class BaseClass
{
    public abstract void DoFoo();
}

public class ClassNumber001 : BaseClass
{
    public override void DoFoo()
    {
        Console.WriteLine("001 Foo");
    }
}

public class ClassNumber002 : BaseClass
{
    public override void DoFoo()
    {
        Console.WriteLine("002 Foo");
    }
}

public interface ISuperman
{
    void Do();
}

public class Superman<T> : ISuperman where T : BaseClass
{
    private T baseClass;

    public Superman(T baseClass)
    {
        this.baseClass = baseClass;
    }

    public void Do()
    {
        this.baseClass.DoFoo();
    }
}

public class MainViewModel
{
    public MainViewModel(IEnumerable<ISuperman> lotsofSuperman)
    {
        foreach(ISuperman superman in lotsofSuperman)
        {
            superman.Do();
        }
    }
}

然后按惯例注册注册所有泛型：

Then use registration by convention to register all the generics:

IUnityContainer container = new UnityContainer();

container.RegisterTypes(
    AllClasses.FromAssembliesInBasePath().Where(t => typeof(BaseClass).IsAssignableFrom(t))
        .Select(t => typeof(Superman<>).MakeGenericType(t)),
    t => new Type[] { typeof(ISuperman) },
    t => t.GetGenericArguments().First().Name,
    WithLifetime.Transient);

container.RegisterType<IEnumerable<ISuperman>, ISuperman[]>();

container.Resolve<MainViewModel>();

在上面的代码中，我们得到了所有继承自 BaseClass ，然后构造一个类型超人< / code>并将其映射到 ISuperman code> BaseClass的。 RegisterTypes调用将相当于为每个BaseClass调用RegisterType：

In the above code we get all classes that inherit from BaseClass and then construct a type Superman<> and map that to ISuperman using the name of the BaseClass. The RegisterTypes call will be equivalent to calling RegisterType for every BaseClass:

container.RegisterType<ISuperman, Superman<ClassNumber001>("ClassNumber001");
container.RegisterType<ISuperman, Superman<ClassNumber002>("ClassNumber002");

然后当> MainViewModel 被解析时，它迭代所有 ISuperman 实例并调用一个打印输出的方法：

Then when MainViewModel is resolved it iterates over all ISuperman instances and calls a method which prints out:

001 Foo >
002 Foo

001 Foo
002 Foo

显示我们注入了2 ISuperman 实例：超人< ClassNumber001> 和超人< ClassNumber002> 。

showing that we injected 2 ISuperman instances: Superman<ClassNumber001> and Superman<ClassNumber002>.

如果您需要针对BaseClasses的特定注册（例如非默认生命期管理器），那么您也可以按照惯例使用注册来注册这些）

If you need specific registrations for the BaseClasses (e.g. non-default lifetime manager) then you can use registration by convention to register those too).

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