Question

我有十几个继承自同一个基类的类。对于每个类，我想在属性更新时更改状态，因此我有一个名为UpdateProperty（oldValue，newValue）的函数。我正在寻找一种方法来使这些通用，所以当我添加一个新类时，我不必添加新的功能。这就是我所拥有的：

    public TicketType UpdateProperty(TicketType oldValue, TicketType newValue)
    {
        if (oldValue != newValue && ObjectState != ObjectState.New && ObjectState != ObjectState.Deleted)
        {
            ObjectState = ObjectState.Changed;
        }
        return newValue;
    }

    public Layout UpdateProperty(Layout oldValue, Layout newValue)
    {
        if (oldValue != newValue && ObjectState != ObjectState.New && ObjectState != ObjectState.Deleted)
        {
            ObjectState = ObjectState.Changed;
        }
        return newValue;
    }

    public Division UpdateProperty(Division oldValue, Division newValue)
    {
        if (oldValue != newValue && ObjectState != ObjectState.New && ObjectState != ObjectState.Deleted)
        {
            ObjectState = ObjectState.Changed;
        }
        return newValue;
    }

    public MasterDataList UpdateProperty(MasterDataList oldValue, MasterDataList newValue)
    {
        if (oldValue != newValue && ObjectState != ObjectState.New && ObjectState != ObjectState.Deleted)
        {
            ObjectState = ObjectState.Changed;
        }
        return newValue;
    }

    public MasterDataListItem UpdateProperty(MasterDataListItem oldValue, MasterDataListItem newValue)
    {
        if (oldValue != newValue && ObjectState != ObjectState.New && ObjectState != ObjectState.Deleted)
        {
            ObjectState = ObjectState.Changed;
        }
        return newValue;
    }


    public Ticket UpdateProperty(Ticket oldValue, Ticket newValue)
    {
        if (oldValue != newValue && ObjectState != ObjectState.New && ObjectState != ObjectState.Deleted)
        {
            ObjectState = ObjectState.Changed;
        }
        return newValue;
    }

正如你所看到的，他们都是这样做的。有人能指出我正确的方向吗？

另见https://dotnetfiddle.net/xXgRuv

Answer 1

是的，但您必须制作通用方法。如果需要，可以将它放在基类中：

public T UpdateProperty<T>(T oldValue, T newValue)
{
    if (!object.Equals(oldValue, newValue) && this.ObjectState != ObjectState.New && this.ObjectState != ObjectState.Deleted)
    {
        this.ObjectState = ObjectState.Changed;
    }

    return newValue;
}

Answer 2

我不仅要设置ObjectState，还要设置方法内的属性值。

将方法放在基类中。

public abstract class BaseClass
{
    public ObjectState ObjectState { get; private set; }

    protected bool Set<T>( ref T field, T value )
    {
        if Equals( field, value ) return false;
        field = value;
        if ( ObjectState == ObjectState.Unchanged )
          ObjectState = ObjectState.Changed;
        return true;
    }
}

并在你继承的课程中

public class Foo : BaseClass
{
    private TicketType _ticketType;
    public TicketType TicketType 
    {
        get => _ticketType; 
        set => Set( ref _ticketType, value );
    }
}

我可以将这些函数重构为一个通用函数吗？

2 个答案: