是否可以将结构绑定到 Unity 中的接口？

发布于 2024-11-29 05:18:43 字数 855 浏览 1 评论 0原文

我想要配置 Unity 将接口（如 ITest）解析为结构（如 struct Test）。到目前为止我有下一个：

<unity>
    <containers>
        <container>
            <types>
                <type
                    type="my.ITest, asm" 
                    mapTo="my.Test, asm">
                </type>
            </types>
        </container>
    </containers>
</unity>

但我收到下一个错误：

Resolution of the dependency failed, type = "my.ITest", name = "(none)".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The type Test cannot be constructed. You must configure the container to supply this value.
At the time of the exception, the container was:    
Resolving my.Test,(none) (mapped from my.ITest,(none))

为什么？

原文

I want configure Unity to resolve an interface, say ITest, to a struct, say struct Test. So far I have next:

<unity>
    <containers>
        <container>
            <types>
                <type
                    type="my.ITest, asm" 
                    mapTo="my.Test, asm">
                </type>
            </types>
        </container>
    </containers>
</unity>

but I'm getting next error:

Resolution of the dependency failed, type = "my.ITest", name = "(none)".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The type Test cannot be constructed. You must configure the container to supply this value.
At the time of the exception, the container was:    
Resolving my.Test,(none) (mapped from my.ITest,(none))

Why?

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千鲤 2024-12-06 05:18:43

问题是你正在尝试使用 Unity 来构造一个结构体；因为结构体是值类型，所以 Activator.CreateInstance 在尝试创建它时会破坏块（因为接口）。

例如：

 var item = Activator.CreateInstance<Test>();

会抛出异常“无法创建接口的实例”。在内部，Unity 可能在链下游的某个地方使用 Activator.CreateInstance（我已经浏览了 Unity 的代码丛一段时间了），这就是它会死掉的地方。

我建议更改为类实现而不是结构。

The problem is that you are trying to use Unity to construct a struct; because a struct is a value type, Activator.CreateInstance is going to blow chunks when trying to create it (because of the interface).

For example:

 var item = Activator.CreateInstance<Test>();

Would throw an exception "Cannot create an instance of an interface". Internally, Unity is probably using Activator.CreateInstance somewhere down the chain (I've been looking through Unity's code plex for a little while now), and that's where it will die.

I'd suggest changing to a class implementation instead of a struct.

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