为什么 C# 编译器不允许接口中的私有属性设置器? [英] Why C# compiler does not allows private property setters in interfaces?

问题描述

在某些情况下，例如 MVVM 视图模型，我有时需要私有 setter，因为视图模型公开只能在内部修改的状态.

In certain scenario like a MVVM view-model, I sometimes needs to have private setter as the view-model exposes a state that can only be modified internally.

那么在接口上需要一个私有的 setter 是错误的吗?(我的意思不是特别在描述的场景中)如果不是，为什么 C# 编译器不允许它?

So is this wrong to need a private setter on an interface? (and I mean not particularly in the described scenario) If not, why does the C# compiler does not allow it?

谢谢.

推荐答案

根据定义，接口是供其他代码使用的契约，而不是供私有成员使用的契约.但是，您可以在接口中指定只读属性并在具体类中实现私有 setter:

By definition, an interface is a contract for other code to use, not for private members. However, you can specify read-only properties in interfaces and implement a private setter in the concrete class:

public interface IFoo
{
    string MyReadonlyString { get; }
} 

public class FooImplementation : IFoo
{
    public string MyReadonlyString { get; private set; }
}

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