C# 实体框架继承,是否可以根据具体类映射/不映射属性?
?在使用继承和实体框架时,是否可以根据具体类将某些属性定义为未映射 例如:C# 实体框架继承,是否可以根据具体类映射/不映射属性?,c#,.net,entity-framework,inheritance,orm,C#,.net,Entity Framework,Inheritance,Orm,?在使用继承和实体框架时,是否可以根据具体类将某些属性定义为未映射 例如: public abstract class Transport { [Key] public Guid Id { get; set; } public string PlateNumber { get; set; } // [NotMapped] ?? public abstract int Length { get; set; } // This property may o
public abstract class Transport
{
[Key]
public Guid Id { get; set; }
public string PlateNumber { get; set; }
// [NotMapped] ??
public abstract int Length { get; set; } // This property may or may not be mapped
}
public class Car : Transport
{
public string Model { get; set; }
// [MapThisOnePlease]
public override int Length { get; set; } // For cars, I want this in the DB
}
public class Train : Transport
{
public int WagonCount { get; set; }
[NotMapped] // No mapping for trains, it is calculated
public override int Length {
get { return this.WagonCount * 15; }
set { throw new NotSupportedException("Length is readonly for Trains"); }
}
}
所以我可以这样做:
int GetTransportLenght(Guid transportId) {
Transport t = context.Transports.Where(t => t.Id == transportId).First();
return t.Length;
}
我也想做这样的事情:
List<Car> GetCarsLongerThan(int length) {
return context.Cars.Where(c => c.Length > length).ToList();//if I try this with a train EF won't be happy
}
关于和的相关问题似乎是重复的如果不希望实体表具有指定的列,可以忽略实体框架fluent api配置中的属性。示例:modelBuilder.Entity().Ignore(x=>x.TotalLength)不会将TotalLength属性添加到表中
public abstract class Transport
{
[Key]
public Guid Id { get; set; }
public string PlateNumber { get; set; }
[NotMapped]
public abstract int TotalLength { get; }
}
public class Car : Transport
{
public string Model { get; set; }
public int Length { get; set; }
public override int TotalLength { get { return this.Length; } }
}
public class Train : Transport
{
public int WagonCount { get; set; }
public override int TotalLength { get { return this.WagonCount * 15; } }
}