C# 基于Switch语句获取值

是否可以基于C中的switch语句获取值

public int NumCandyBars (string candyBar)
{
    get {

        switch (candyBar)
        {
            case "twix":
                    { return _numTwix; }
            case "snickers":
                    return _numSnickers;
            case "kitkat":
                return _numKitKat;

            default: return 0;
        }                
    }
}

因此，上面的代码应该返回一个基于字符串类型的值

public enum CandyBar
{
    twix,
    snickers,
    kitkat
}

 public int NumCandyBars (CandyBar candyBar)
        {    
                    switch (candyBar)
                    {
                        case CandyBar.twix:
                              return _numTwix;
                        case CandyBar.snickers:
                             return _numSnickers;
                        case CandyBar.kitkat:
                            return _numKitKat;

                        default: return 0;
                    }
        }

---

不一定需要多态性，但select需要一个Enum在此上下文中满足的常量值。

在我看来，您最好避免切换，而使用字典

    public int NumCandyBars (string candyBar)
    {
        int retval = 0;
        switch (candyBar)
        {
            case "twix":
                retval = _numTwix;
                break;
            case "snickers":
                retval =_numSnickers;
                break;
            case "kitkat":
                retval = _numKitKat;
                break;
        }
        return retval;
    }

像这样：

public int NumCandyBars (string candyBar)
{
    var map = new Dictionary<string, int>()
    {
        { "twix", _numTwix },
        { "snickers", _numSnickers },
        { "kitkat", _numKitKat },
    };

    return map.ContainsKey(candyBar) ? map[candyBar] : 0;
}

---

或者，您也可以从配置文件中加载数据，或从枚举或数据库中提取数据，并且您的numcandybar无需更改。

您想要这样做的事实是使用多态性！NumCandyBars应该是一个方法还是属性？删除get关键字它应该是一个methodWell，然后删除get关键字

private Dictionary<string, int> map = new Dictionary<string, int>()
{
    { "twix", _numTwix },
    { "snickers", _numSnickers },
    { "kitkat", _numKitKat },
};

public int NumCandyBars (string candyBar)
{
    return map.ContainsKey(candyBar) ? map[candyBar] : 0;
}

public void SomeMethod()
{
    map["mars"] = 42;
}