blocks|key|5192679|text|如错误所示，您只需将Status的定义拉出接口。我知道它破坏了封装，但确实没有办法解决这个问题。我建议您将Status的名称更改为与Thing关系密切的名称--+ThingStatus应该可以做到这一点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5192680|enum+ThingStatus+{+Accepted,+Denied,+Pending+};

public+interface+Thing
{
++++ThingStatus+status+{+get;+}
++++etc...
}|code-block|syntax|javascript|5192681|entityMap^0|A|6|1H|6|1U|5|29|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|L|$]]

As the error indicates, you just have to pull the definition of <code>Status</code> outside of the interface. I understand that it breaks encapsulation, but there's really no way around this. I suggest you change the name of <code>Status</code> to something which indicates a strong relation to <code>Thing</code> -- <code>ThingStatus</code> should do the trick.

<pre><code>enum ThingStatus { Accepted, Denied, Pending };

public interface Thing
{
 ThingStatus status { get; }
 etc...
}
</code></pre>

blocks|key|1841933|text|哦，是的，如果您需要这样的实现，那么解决方案就是使用抽象类。抽象类不是一个糟糕的设计，在这样的情况下肯定是有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1841934|如果您坚持使用接口，我担心您将不得不遵循p.s.w.g的解决方案，并打破一两条规则(这些只是指导方针，真的)。|1841935|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Oh yes, the solution is to use an abstract class if you need such implementation. Abstract classes are not a bad design and are certainly useful in situations like this.

If you insist on using interfaces, I'm afraid you'd have to go with the solution from p.s.w.g and break a rule or two (those are just guidelines anyway, really).

blocks|key|5676726|text|abstract类和interface是不同的东西。abstarct类是抽象的，高于您的域模型，而接口是您的域实体的契约(行为)。如有必要，您可以在解决方案中同时使用这两种方法。在具体场景中，status不是行为，而是实体的状态。我认为抽象类是更可靠的选择。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5676727|entityMap^0|0|8|A|9|Q|8|2O|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

<code>abstract</code> class and <code>interface</code> are different things. <code>abstarct</code> class is abstraction, higher than your domain model and interface is the contract (behavior) of your domain entity. You can use both in your solution as necessary. In concrete scenario <code>status</code> is not behavior it just state of entity. I think abstract class is more reliable choice.

blocks|key|684530|text|必须在命名空间内或命名空间外将类型声明为公共类型，然后在接口中声明此类型的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|684531|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You must declare a type as public in namespace or outside of namespace and then declare a method of this type in the interface

I have an abstract class in an API that is used by methods in another assembly. The class has a nested enum defined inside it, a bit like this:

<pre><code>abstract public class Thing
{
 public enum Status { Accepted, Denied, Pending };
 abstract public Status status { get; private set; }
 etc...
}
</code></pre>

I then decided it would be a better design if Thing was an interface. But I can't do this:

<pre><code>public interface Thing
{
 enum Status { Accepted, Denied, Pending };
 Status status { get; }
 etc...
}
</code></pre>

This produces the error message "Interfaces cannot declare types." However, if I move the definition of the enum outside of the interface, firstly I'd be breaking encapsulation (the Status type really belongs to Thing and is meaningless on its own) and more importantly I would have to go and modify the code in the many other assemblies that use this. Can you think of any solutions?

Interfaces cannot declare types

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在一个API中有一个抽象类，它被另一个程序集中的方法使用。这个类中定义了一个嵌套的枚举，有点像这样：abstract public class Thing{    public enum Status { Accepted, Denied, Pending };    abstract public Status s...

问接口不能声明类型
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