Linq 0..1-一关联
嗨，我在 Linq 方面遇到了一个大问题。我必须做0。 这两个类中的 1 对一关联：
[Table(Name = "TB_Points")]
public class Point
{
private int _ID = 0;
[Column(Storage = "_ID", DbType = "Int NOT NULL IDENTITY", IsPrimaryKey = true, IsDbGenerated = true)]
public int ID { get { return this._ID; } }
}
[Table(Name = "TB_TimePoint")]
public class TimePoint
{
private int _ID = 0;
[Column(Storage = "_ID", DbType = "Int NOT NULL IDENTITY", IsPrimaryKey = true, IsDbGenerated = true)]
public int ID { get { return this._ID; } }
//here is the association
public Point Pos { get; set; }
}
Point 是我的通用类，因此有时 Point 可以在没有 TimePoint 的情况下存在，因此关联中为 null。我不需要了解 Point 类中的 TimePoint。 我所有的尝试都失败了。我不知道问题是出在 IsDbGenerate = true 还是其他方面。请帮忙。谢谢
Hi I have a big problem with Linq. I have to do a 0.
.1-to-one association within this two classes:
[Table(Name = "TB_Points")]
public class Point
{
private int _ID = 0;
[Column(Storage = "_ID", DbType = "Int NOT NULL IDENTITY", IsPrimaryKey = true, IsDbGenerated = true)]
public int ID { get { return this._ID; } }
}
[Table(Name = "TB_TimePoint")]
public class TimePoint
{
private int _ID = 0;
[Column(Storage = "_ID", DbType = "Int NOT NULL IDENTITY", IsPrimaryKey = true, IsDbGenerated = true)]
public int ID { get { return this._ID; } }
//here is the association
public Point Pos { get; set; }
}
The Point is a my general class so some times a Point can exists without the TimePoint, so there is null in the association. And I don't need to know about the TimePoint from the Point class.
All my attempts failed. I don't know whether the problem is in IsDbGenerated = true or in other stuff. Please help. Thx
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典型的方法是使 TimePoint 的主键也成为 Point 主键的外键。
The typical approach is to make TimePoint's primary key also be a foreign key to the Point's primary key.