我申报会员时可以指定接口吗？ [英] Can I specify interfaces when I declare a member?

问题描述

我需要我的班级成员作为控制，并且要实现我们定义的接口。

I need a member of my class to be a Control, and for it to implement an interface we define.

如果我这样声明......

If I declare it like this...

public class MyClass
{
    public Control MyMember;
}

...然后我没有得到接口方法，但如果我声明就像这样...

... then I don't get the interface methods, but if I declare it like this...

public class MyClass
{
    public IMyInterface MyMember;
}

...然后我没有得到Control方法。有没有办法指定必须将MyMember初始化为从两者继承的类型？我在MSDN上找不到一个。类似......

...then I don't get the Control methods. Is there a way to specify that MyMember must be initialised to a type that inherits from both? I can't find one on MSDN. Something like...

public class MyClass
{
    public Control : IMyInterface MyMember;
}

...或...

public class MyClass
{
    public Control MyMember : IMyInterface;
}

...除了这些都不起作用。我可以在声明成员时指定接口，如果是，如何？

... except that neither of those work. Can I specify interfaces when I declare a member, and if so, how?

推荐答案

您可以使用带有约束的泛型：

You can use generics with constraints:

public interface MyClass {
    public T GetMyControl() where T : Control, IMyInterface { /* ........ */ }
}

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