搜索HashSet的最佳方式

Question

我有一个Objs的HashSet与Obj定义如下:

public class Obj 
{
    private int _id;
    private string _desc;
    private int _sum;

    public int Id
    {
        get { return _id; }
        set { _id = value; }
    }

    public string Description
    {
        get { return _desc; }
        set { _desc = value; }
    }

    public int Sum
    {
        get { return _sum; }
        set { _sum = value; }
    }

    public Obj(int id, string desc, int sum)
    {
        _id = id;
        _sum = sum;
        _desc = desc;
    }

    public override bool Equals(Obj other)
    {
        return this._sum == other._sum 
            && this._desc == other._desc;
    }

    public override int GetHashCode()
    {
        int hash = 13;
        hash = (hash * 7) + _sum.GetHashCode();
        hash = (hash * 7) + _desc.GetHashCode();

        return hash;
    }
}

这工作正常但我在HashSet.Add(obj)返回false 时从HashSet中检索时遇到问题.什么是检索的最佳方式_id的Obj一个已经包含在HashSet在这种情况下？

Answer 1

我看到它的方式:sum + description(用于hashcode,equals)= key和_id(你想要检索的内容)= value.

该场景清楚地指向字典而不是散列集....集合不适用于任意查找/检索.