将setter添加到派生接口 [英] Adding a setter to a derived interface

问题描述

是否有可能以某种方式在C＃中实现此行为：

Is it possible somehow to achieve this behavior in C#:

public interface IReadOnly
{
    Data Value { get; }
}

internal interface IWritable : IReadOnly 
{
    Data Value { get; set; }
}

我希望能够将readonly接口公开给外部程序集，但是在内部使用可写接口（我也可以用不同的方式实现）。

I want to be able to expose a readonly interface to outside assemblies, but use a writable interface internally (which I could also implement in different ways).

我知道我可以使用抽象类来实现 IReadOnly 但添加了setter，但这迫使我从该类派生所有内部实现。

I know I can use an abstract class which implements IReadOnly but adds setters, but that forces me to derive all internal implementations from that class.

推荐答案

这不是问题：

public interface IReadOnly {
    Data Value { get; }
}

internal interface IWritable : IReadOnly {
    new Data Value { get; set; }
}

internal class Impl : IWritable {
    public Data Value { get; set; }
}

Impl.Value属性实现负责两者 IReadOnly.Value和IWritable.Value，如此测试片段所示：

The Impl.Value property implementation takes care of both IReadOnly.Value and IWritable.Value, as demonstrated in this test snippet:

        var obj = new Data();
        var target = new Impl();
        var irw = (IWritable)target;
        irw.Value = obj;
        var iro = (IReadOnly)target;
        System.Diagnostics.Debug.Assert(Object.ReferenceEquals(iro.Value, obj));

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