Question

嗯，简单地说，我现在就了解结构（C＃的新功能）这是我的结构（+ ctor）

public struct BusLine
{
    public int busNumber { get; set; }
    public int passengersNumber { get; set; }
    public double drivePrice { get; set; }
    public double distanceBeginToEnd { get; set; }
    public int stopsNumber { get; set; }

    public BusLine(int _busNumber, int _passengersNumber, double _drivePrice, double _distanceBeginToEnd, int _stopsNumber)
    {
        busNumber = _busNumber;
        passengersNumber = _passengersNumber;
        drivePrice = _drivePrice;
        distanceBeginToEnd = _distanceBeginToEnd;
        stopsNumber = _stopsNumber;
    }
}

这是我的Bus类

public class Bus
{
    public BusLine Line { get; set; }
    public int currentPassengers { get; set; }
    public int currentStop { get; set; } = 1;

    public void EnterStation(int newPassengers, int passengerLeaves)
    {
        currentPassengers = Line.passengersNumber + newPassengers - passengerLeaves;
    }
    public string Drive()
    {
        if (currentStop == this.Line.stopsNumber)
        {
            return string.Format("Stop number: {0}\nPassengers quantity: {1}\nThis is the final STOP!\n", currentStop, currentPassengers);
        }
        return string.Format("Stop number: {0}\nPassengers quantity: {1}\n", currentStop++, currentPassengers);
    }
}

现在的问题是：当我以这种方式实例化struct和class时（在Program.cs中）：

Random rand = new Random();
BusLine BLine = new BusLine(_busNumber: 88, _passengersNumber: 22, _drivePrice: 6.90, _distanceBeginToEnd: 101.4, _stopsNumber: 15);
Bus bus = new Bus();
while (BLine.stopsNumber != 0)
{
    BLine.stopsNumber--;
        bus.EnterStation(rand.Next(1, 12), rand.Next(1, 12));
        string getDrive = bus.Drive();
        Console.WriteLine(getDrive);
}

似乎是这一行（在Bus.cs中）：

currentPassengers = Line.passengersNumber + newPassengers - passengerLeaves;

Line.passengersNumber = 0 和

if (currentStop == this.Line.stopsNumber)

永远不会发生，因为this.Line.stopsNumber始终为零现在我明白使用结构的东西是错误的，但我在BusLine.cs的ctor中初始化它们，那么在Bus.cs中使用时它们的值如何仍为0？先谢谢你们

Answer 1

看起来你从未将BLine设置为公交线路。将该总线声明更改为：

Bus bus = new Bus() { Line = BLine };

直到你这样做，BLine与bus.Line无关，只是属于同一类型。

在类中使用结构时，值为零

1 个答案: