Question

我有一个正在处理我创建的对象的类;

StockItem2 = new CarEngine("Mazda B6T", 1252, 8025, 800, "Z4537298D");
//StockItem2 = new CarEngine("description", cost, invoice #, weight, engine #)

我还有一个静态int，将最后一个发票号设置为10,000。

 internal static int LastStockNumber = 10000;

如果没有输入发票号码，我希望它每次自动分配一个并递增1，所以10,001 / 10,002等。

CarEngine有2个构造函数，如果没有输入，则这个构造函数用于分配发票编号。它需要描述，成本，重量，引擎数量，并且应该从10,001开始自动分配，但它似乎一次增加2-3，任何想法为什么？

public CarEngine(string Description, int CostPrice, int Weight, string EngineNumber)
        : base(Description, CostPrice, Weight)
    {
        LastStockNumber++;
        StockNumber = LastStockNumber;
        this.CostPrice = CostPrice;
        this.Description = Description;
        this.Weight = Weight;
        this.EngineNumber = EngineNumber;
    }

// this is in the stockitem class //
public StockItem(string Description, int CostPrice)
    {
        LastStockNumber++;
        StockNumber = LastStockNumber;            
        this.Description = Description;
        this.CostPrice = CostPrice;
    }
//this is in the heavystockitem class//
public HeavyStockItem(string Description, int CostPrice, int Weight) :     base(Description, CostPrice)
    {

        StockNumber = LastStockNumber;
        LastStockNumber++;
        this.CostPrice = CostPrice;
        this.Description = Description;
        this.Weight = Weight;
    }

Answer 1

您可能在基类和派生类构造函数中递增LastStockNumber。

Answer 2

我从签名中猜测，CarEngine继承自HeavyStockItem继承自StockItem。

鉴于此，在创建新的CarEngine对象时，它将调用基础构造函数，该构造函数将调用其自己的基础构造函数。

由于每个构造函数都具有以下代码：LastStockNumber++;然后对于CarEngine，数字将增加3倍，对于HeavyStockItem，它将增加两倍，并且对于StockItem 1}}它只会增加一次。

鉴于您正在调用基础构造函数，您应该只初始化类的唯一内容。尝试将代码更改为以下内容：

public CarEngine(string description, int costPrice, int weight, string engineNumber)
    : base(description, costPrice, weight)
{
    EngineNumber = engineNumber;
}

//this is in the heavystockitem class//
public HeavyStockItem(string description, int costPrice, int weight)
    : base(description, costPrice)
{

    Weight = weight;
}

// this is in the stockitem class //
public StockItem(string description, int costPrice)
{
    LastStockNumber++;
    StockNumber = LastStockNumber;
    Description = description;
    CostPrice = costPrice;
}

对于奖励积分，请注意我已根据普遍接受的C＃标准将构造函数参数从PascalCase更改为camelCase。这有助于您区分属性（首字母大写）和参数（首字母小写）。

c＃在类中增加对象

2 个答案: