如何限制采取Action< T>的方法以允许来自特定类的代理 [英] How can I constrain a method that takes an Action<T> to only allow delegates from a specific class

问题描述

如果我有这样的方法签名;

If I have a method signature like this;

public void Execute(Action<T> action) {
    ...
}

但是我想限制它，以便提供的动作只来自MyActions类，在c＃中如何实现？

but I want to constrain it so that the supplied 'action' only comes from the class 'MyActions', how can this be achieved in c#?

为了尝试制作它更清楚;

In order to try and make it clearer;

例如我有一个名为MyActions的类;

For example I have a class called MyActions;

public class MyActions {
    public void FirstAction<T>(T item) {
        ...
    }

    public void SecondAction<T>(T item) {
        ...
    }
}

我有我想要它，所以方法将接受的唯一的操作是这个类的。

I have the above method and I want it so that the only actions that the method will accept are those from this class.

我不希望任何人可以提供他们必须来自MyActions类。

I do not want it to be possible for anyone to supply an arbitrary action, they must come from the class 'MyActions'.

可以做吗？

Regards，

Ryan。

推荐答案

明确你想要仅接受 MyActions 的成员的意图的一种方式是：

One way to make clear your intent that you want to accept only members of MyActions would be something like:

public void Execute(Func<MyActions, Action<T>> actionSelector)

你可以像

Execute(actions => actions.SomeAction);

当然这只有在的方法（或委托属性） MyActions 不是静态的。

Of course, this works only if the methods (or delegate properties) of MyActions are not static.

就像我说的，这使你的意图清楚，但实际上并不限制方法，有人可以调用你的方法，如：

And like I said, this makes your intent clear, but doesn't actually constraint the methods, someone could still call your method like:

Execute(ignored => otherAction);

一般来说，这似乎是一件很奇怪的事情。

In general this seems to me like a weird thing to want.

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