Question

我试图用克隆扩展名克隆通用列表。

List<Vehicle> newList = currentVehicleList.Clone().ToList();

public static IList<T> Clone<T>(this IList<T> listToClone) where T : ICloneable
{
    return listToClone.Select(item => (T)item.Clone()).ToList();
}

我实现了Vehicle对象ICloneable

public class Vehicle : ICloneable
{
    [Key]
    public int VehicleId { get; set; }
    public string Plaka { get; set; }
    public double Volume { get; set; }
    public double FilledVolume { get; set; }
    public double DepartureTime { get; set; }
    public double IdleVolume
    {
        get { return this.Volume - this.FilledVolume; }
        set { }
    }
    public double FilledWeight { get; set; }
    public double IdleWeight {
        get { return this.WeightCapacity - this.FilledWeight; } 
        set{}
    }
    public decimal ConstantCost { get; set; }
    public string VehicleType { get; set; }
    public string Model { get; set; }
    public bool IsRent { get; set; }
    public double AvgVelocity { get; set; }
    public decimal CostPerKilometer { get; set; }
    public double WeightCapacity { get; set; }
    public bool InProgress { get; set; }
    public List<Order> FilledOrders { get; set; }

    public object Clone()
    {
        return this.MemberwiseClone();
    }
}

扩展程序克隆我的列表但车辆对象的 FilledOrders 属性已键入List<Order>，因此克隆不会对FilledOrders列表执行。

public class Order : ICloneable
{
    [Key]
    public int OrderId { get; set; }
    public Customer Customer { get; set; }
    public bool IsTwoWayDirection { get; set; }
    public DateTime DeliveryDate { get; set; }
    public Dictionary<Product,int> OrderedProducts { get; set; }
    public Dictionary<Product, int> ReOrderedProducts { get; set; }
    public Double DemandTotalWeigth { get; set; }
    public Double DemandTotalVolume { get; set; }
    public Double PickupTotalWeigth { get; set; }
    public Double PickupTotalVolume { get; set; }
    public double EarliestArrivedTime { get; set; }
    public double ArrivedTime { get; set; }
    //TODO :Timespana cevrilecek
    public Double AcceptStartDate { get; set; }
    public Double AcceptEndDate { get; set; }
    public Double ServiceTime { get; set; }
    //

    public object Clone()
    {
        return this.MemberwiseClone();
    }
}

如果列表项有另一个列表，克隆的解决方案是什么？

Answer 1

在Vehicle课程中，只需展开Clone()功能即可克隆列表：

public object Clone()
{
    Vehicle clone = this.MemberwiseClone();
    List<Order> clonedOrders = new List<Order>();
    foreach (Order order in this.FilledOrders)
        clonedOrders.Add((Order)order.Clone());
    clone.FilledOrders = clonedOrders;
    return clone;
}

毕竟，这是实施IClonable的重点。否则你可以在任何事情上致电MemberwiseClone()。

顺便说一句，Order类中的Dictionary对象也不会被克隆，因为它们也是引用类型。为了解决这个问题，原理是相同的：扩展Clone()的{{1}}功能，并在那里手动创建它们的副本。如果有必要克隆那个Order个项目，请在Product课程中实施IClonable并在那里执行相同操作。

只要没有循环引用，您就可以继续实施Product并在IClonable函数中修复引用类型。

深度克隆如果列表项有另一个列表

1 个答案: