将基本抽象类属性存储在子类数据库表中
本文关键字:子类 数据库 存储 抽象类 属性 | 更新日期: 2023-09-27 18:20:19
我在存储抽象类的属性时遇到了一些问题,构造函数似乎工作得很好。但是,我无法将基本属性存储在子类数据库表中。
public abstract class Vehicle : IComparable< Vehicle >, IComparable {
public Int16 VehicleID;
public DateTime ProductionDate;
public Vehicle(Int16 _ Vehicle ID,DateTime _ProductionDate)
{
this.AccidentID = _ AccidentID;
this.ProductionDate = _ProductionDate;
}
int IComparable.CompareTo(object other) {
return CompareTo((Vehicle)other);
}
public int CompareTo(Vehicle other){
return this.ProductionDate.CompareTo(other.ProductionDate);
}
public Vehicle()
{}
}
public class Car : Vehicle
{
public Car ()
{
}
public Car (Int16 _VehicleID,DateTime _ProductionDate, Int16 _CarAttribute1, Int16 _CarAttribute2):base(_Vehicle ID,_ProductionDate)
{
this.AccidentID = _ AccidentID;
this.ProductionDate = _ProductionDate;
this.CarAttribute1 = _CarAttribute1
this.CarAttribute2 = _CarAttribute2
}
[PrimaryKey, AutoIncrement, Column("Attribute1")]
public Int16 CarAttribute1{ get; set;}
[Column("Attribute2")]
public Int16 CarAttribute2{ get; set;}
}
我对C#还很陌生,所以非常感谢您的指导:)我错过了什么?
在基类中,应该使用属性而不是字段,因此调整基类如下:
public abstract class Vehicle : IComparable<Vehicle>, IComparable {
public Int16 AccidentID { get; set; }
public DateTime ProductionDate { get; set;}
public Vehicle(Int16 _ Vehicle ID,DateTime _ProductionDate)
{
this.AccidentID = _ AccidentID;
this.ProductionDate = _ProductionDate;
}
int IComparable.CompareTo(object other) {
return CompareTo((Vehicle)other);
}
public int CompareTo(Vehicle other){
return this.ProductionDate.CompareTo(other.ProductionDate);
}
public Vehicle()
{}
}
所以我改了:
public Int16 VehicleID;
public DateTime ProductionDate;
至:
public Int16 AccidentID { get; set; }
public DateTime ProductionDate { get; set;}
BTW:基类中有VehicleID字段,但在构造函数中,您将值设置为AccidentiID,而不是VehicleID。我认为这只是描述中的一个拼写错误,对吧?所以我使用了AccidentID作为属性名称,所以请检查它是否正确。