C#:数组属性的getter和setter表达式

Question

如何CoolerFanIsOn在类中编写数组属性的getter和setter表达式CoolerSystem？我展示了非阵列属性的类似的所需表达IsOn的Lamp类.

class CoolerFan{

    bool isOn;
    public bool IsOn {
        get => isOn;
        set {
            isOn = value;
        }
    }
}

class CoolerSystem {

    private CoolerFan[] = new CoolerFan[5];
    private bool[] coolerFanIsOn = new Boolean[5];

    // invalid code from now

    public bool[] CoolerFanIsOn {
        get => coolerFanIsOn[number];
        set {
            coolerFanIsOn[number] = value;
        }
    }
}

Answer 1

你可以使用索引器:

public class CoolerSystem
{
    private bool[] _coolerFanIsOn = new Boolean[5];

    public bool this[int index]
    {
        get => _coolerFanIsOn[index];
        set => _coolerFanIsOn[index] = value;
    }
}

顺便说一句,在=>为表达浓郁性质,其是在C#6新.如果你不能使用(setter在C#7中是新的)使用旧的语法,索引器与它无关(C#3):

public bool this[int index]
{
    get { return _coolerFanIsOn[index];  }
    set { _coolerFanIsOn[index] = value; }
}