Question

以下是我想做的事情：

public interface IInject<in T>
{
    [Inject]
    void Inject(T reference);
}

private class Foo : IInject<Bar>
{
    public Bar Bar { get; private set; }

    void IInject<Bar>.Inject(Bar reference)
    {
        Bar = reference;
    }
}

但是没有任何东西被注入，只有我开始工作的方式是属性和隐式实现：

private class Foo : IInject<Bar>
{
    public Bar Bar { get; private set; }

    [Inject]
    public void Inject(Bar reference)
    {
        Bar = reference;
    }
}

有办法吗？

Answer 1

Ninject doesn't behave like that by default. You will need to create a custom selector.*

Given your types this selector exhibits the behavior you've described,

class ExplicitSelector : Selector
{
    public ExplicitSelector(
        IConstructorScorer constructorScorer, 
        IEnumerable<IInjectionHeuristic> injectionHeuristics) 
        : base(constructorScorer, injectionHeuristics)
    {
    }

    public override IEnumerable<MethodInfo> SelectMethodsForInjection(Type type)
    {
        // Gets all implemented interface and grabs an InterfaceMapping. 
        var implementedInterfaces = type.GetInterfaces();

        foreach (var map in implementedInterfaces.Select(type.GetInterfaceMap))
        {
            for (var i = 0; i < map.InterfaceMethods.Length; i++)
            {
                // Check each interface method for the Inject attribute, and if present
                if (map.InterfaceMethods[i].CustomAttributes.Any(x => x.AttributeType == typeof (InjectAttribute)))
                {
                    // return the target method implementing the interface method. 
                    yield return map.TargetMethods[i];
                }
            }
        }

        // Defer to NInject's implementation for other bindings. 
        foreach (var mi in base.SelectMethodsForInjection(type))
        {
            yield return mi;
        }
    }
}

It's added to the kernel simply,

standardKernel.Components.Remove<ISelector, Selector>();
standardKernel.Components.Add<ISelector, ExplicitSelector>();

And then calls to get an IInject<Bar> will work as you describe, using the custom selector.

*There may be a better extension point to implement this with NInject. I'm far from an expert on NInject or it's implementation.

是否可以使用Ninject注入明确实现的方法？

1 个答案: