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请告诉我,我怎么能为模型在asp.net mvc3中做“触发器”或“回调”? 例如,我在DB 3款MVC 3,插入之后,更新之前等
public class Order
{
public int ID { get; set; }
public string order_num { get; set; }
public virtual ICollection<Task> Tasks { get; private set; }
}
public class Task
{
public int ID { get; set; }
public int length { get; set; }
public int sheets_num { get; set; }
[Required]
public int orderID { get; set; }
[ForeignKey("orderID")]
public virtual Order Order { get; set; }
[Required]
public int spoolID { get; set; }
[ForeignKey("spoolID")]
public virtual Spool Spool { get; set; }
}
public class Spool
{
public int ID { get; set; }
public string name { get; set; }
public int weight { get; set; }
public int weight_meter { get; set; }
public virtual ICollection<Task> Tasks { get; set; }
}
在节目我创造秩序 - 它有很多的任务。当我创建任务 - 它应该改变重滑
Task.Spool.Weight = Task.Spool.Weight - (Task.length * Task.sheets_num * Task.Spool.weight_meter)
,当我删除秩序 - 它应该删除所有任务和更新改变阀芯等的重量(spool.weight = spool.weight + WeightOfOldTask - WeightOfNewTask )
我如何在asp中做这件事?在rails中,我可以在模型中使用回调函数(after_update和其他)