Ninject通过绑定不公约泛型类型的工作

问题描述

我使用.NET 4.5，Ninject 3 作为绑定如下：

kernel.Bind（X => X
.FromAssembliesMatching（ assembly.dll）
.SelectAllClasses（）InheritedFrom（typeof运算（ICommandHandler<>））
.BindAllInterfaces（））;


这是正确约束力的：

公共类MyCommandHandler：ICommandHandler< MyCommand>


但不绑定：

公共类MyGenericCommandHandler< T> ：ICommandHandler< MyGenericCommand< T>>


不过，以前的绑定工作，如果我增加对具体的实现我的泛型类的，如个人绑定

kernel.Bind（typeof运算（ICommandHandler< MyGenericCommand<浮动>>））
。要（typeof运算（MyGenericCommandHandler<浮动>））
kernel.Bind（typeof运算（ICommandHandler< MyGenericCommand< INT>>））
。要（typeof运算（MyGenericCommandHandler< INT>））


但添加每个单独的一般类型违背约定的目的，需要添加对每个可能的个别类型如浮动结合，整型，字符串，等等...

解决方案

EDIT: Doesn't compile [and the fact it doesn't reveals the requirement doesn't make sense], see reasoning for this conclusion in the comments.

---

This is just the normal open generics case. As alluded to with a link in my earlier comment, the way a basic bind to make that DRY looks is simply:

kernel.Bind(typeof(ICommandHandler<MyGenericCommand<>>))
    .To(typeof(MyGenericCommandHandler<>));

This binding will then suffice for any T variant of ICommandHandler<MyGenericCommand<T>>.

In the context of doing convention based binding it to mapping what you're expecting, the problem is that SelectAllClasses().InheritedFrom(typeof(ICommandHandler<>)) does not include generic classes -- this makes sense as it's rare that you can specify generalized rules on non concrete classes.

You can either

• use a different Projection portion of the DSL to select the Generic classes and then bind them in some convention based manner
• expose a NinjectModule from assemblies exposing [open] generic services which does the above Bind and then do a kernel.Load() of the module [prob by the DLL name pattern].

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