C#避免为接口(interface)属性重复代码

Question

给定界面:

interface IVotable
{
    int TotalUpvotes { get; }
    int TotalDownvotes { get; }
    int TotalVoteScore { get; }
}

通过实现:

public class Comment : IVotable
{
    public int TotalUpvotes { get; private set; }
    public int TotalDownvotes { get; private set; }
    public int TotalVoteScore { get { return TotalUpvotes - TotalDownvotes + 1 ; } }
}

避免在每个类(class)中以相同方式实现 TotalVoteScore 的最佳方法是什么？

Answer 1

如果您不想重新实现的只是 TotalVoteScore，那么这就是要走的路:

public interface IVotable
{
    int TotalUpvotes { get; }
    int TotalDownvotes { get; }
    int TotalVoteScore { get; }
}

public abstract class VotableBase : IVotable
{
    public abstract int TotalUpvotes { get; protected set; }
    public abstract int TotalDownvotes { get; protected set; }
    public virtual int TotalVoteScore { get { return TotalUpvotes - TotalDownvotes + 1 ; } }
}

public class Comment : VotableBase
{
    public override int TotalUpvotes { get; protected set; }
    public override int TotalDownvotes { get; protected set; }
}