使用autofac创建需要参数的对象的正确方法是什么? [英] What is the proper way to create objects which require parameters using autofac?

问题描述

我认为我了解了有关依赖倒置和使用IoC容器的大部分信息，但对我来说仍然不清楚.如何使用autofac自动化以下工厂:

I think I get most things about dependency inversion and using an IoC container, but one thing still does not appear clear to me. How do I use autofac to automate the following factory:

public class WidgetFactory
{
    public static IWidget Create(int foo, double bar)
    {
        return new Widget(foo, bar);
    }
}

public class Widget
{
    private readonly int foo;
    private readonly double bar;

    public Widget(int foo, double bar)
    {
        this.foo = foo;
        this.bar = bar;
    }
}

在其他地方...

public class FoobarUser
{
    public void Method()
    {
        var widget = WidgetFactory.Create(3, 4.863);
        // Do something with my widget
        // Possibly add it to a widget collection
    }
}

基本上，我需要创建成千上万个小部件，但我不确定这样做的最佳方法.考虑到Method不包含对IContainer的引用，我将如何使用autofac创建小部件工厂，以及如何在Method中使用它?

Basically, I need thousands of widgets to be created and I'm not sure of the best way of doing so. How would I create the widget factory using autofac and how would I use that in Method, bearing in mind that Method does not contain a reference to the IContainer?

推荐答案

解决此问题的方法如下:

The way to fix this problem is the following:

更改WidgetFactory以定义用于创建窗口小部件的委托:

Change WidgetFactory to define a delegate for creating widgets:

public class WidgetFactory
{
    public delegate IWidget Create(int firstParam, double secondParam);
}

在autofac模块中，使用RegisterGeneratedFactory方法连接工厂.这将自动为您创建工厂:

In your autofac module, wire up the factory using the RegisterGeneratedFactory method. This will automatically create your factory for you:

public class TestClassModule : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        base.Load(builder);

        builder.RegisterType<Widget>().As<IWidget>();
        builder.RegisterGeneratedFactory<WidgetFactory.Create>(new TypedService(typeof(IWidget)));

        builder.RegisterType<FoobarUser>();
    }
}

将工厂注入FoobarUser:

Inject the factory into FoobarUser:

public class FoobarUser
{

    private readonly WidgetFactory.Create factory;

    public FoobarUser(WidgetFactory.Create factory)
    {
        this.factory = factory;
    }

    public void Method()
    {
        var widget = this.factory(3, 4.836);
        // Do something with my widget
        // Possibly add it to a widget collection
    }
}

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