Code First
1. 基于Model中 字段 ID / [className]+ID / 某字段有[Key] , 来自动生成主键的, 如果没有将会报如标题的错.
public class Order{
public int ID{get;set;}
}
public class Order{
public int OrderID{get;set;}
}
public class Order{
[Key]
public int CustomID{get;set;}
}
2. 当需要复合主键时,则要在各个主键上加 [Key, Column(Order=0)], [Key, Column(Order=1)] ... , Order 按列顺序递增设置.
public class Order{
[Key,Column(Order=0)]
public string OrderKey{get;set;}
[Key,Column(Order=1)]
public string OrderName{get;set;}
}