如何在不使用InjectAttribute的情况下使Ninject选择特定的构造函数? [英] How to make Ninject choose a specific constructor without using InjectAttribute?

问题描述

1)除了应用InjectAttribute之外，有没有办法让Ninject在代码中选择特定的构造函数?

1) Is there a way to make Ninject select a specific constructor in code other than applying the InjectAttribute?

2)另外，如何为构造函数的这些参数提供值?

2) Also, how do I supply values for these arguments of the constructor?

3)我可以在解析或创建对象时(即当我调用kernel.Get<T>()时)覆盖这些参数值吗?

3) Can I override these argument values on resolution or creation of the object, i.e. when I call kernel.Get<T>()?

推荐答案

有ToConstructor绑定方法:

Bind<IMyService>().ToConstructor(
    ctorArg => new MyService(ctorArg.Inject<IFoo>()));

您可以使用3种机制指定绑定值:

You can specify values on binding using 3 mechanisms:

• 为依赖项(Bind<IFoo>().To<Foo>())创建绑定
• 指定构造函数参数(在绑定末尾添加WithConstructorArgument(typeof(IFoo), new Foo()))
• 如果我没记错的话，还可以使用ToConstructor语法(例如ToConstructor(ctorArg => new MyService(myFoo));
)来指定它

• create a binding for the dependency (Bind<IFoo>().To<Foo>())
• specify a constructor argument (add a WithConstructorArgument(typeof(IFoo), new Foo()) to the end of the binding)
• if i remember correctly, you can also specify it in the ToConstructor syntax like ToConstructor(ctorArg => new MyService(myFoo));

(另请参见 http://www.planetgeek. ch/2011/05/28/ninject-constructor-selection-preview/)

您可以通过传递 ConstructorArgument ，或者最好是 (或某些自定义 IParameter )更改为分辨率:

You can specify values on resolution by passing a ConstructorArgument or, preferrably, a TypeMatchingConstructorArgument (or some custom IParameter) to the resolution:

IResolutionRoot.Get<IMyService>(new TypedConstructorArgument(
    typeof(IFoo),
    (ctx, target) => myFooInstance));

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