如何使用Entity-Framework code-first将实体持久保存到数据库时如何执行代码？(How can I execute code when an entity is being persisted to the database with Entity-Framework code-first?)

 当使用EF / code-first将实体保存到数据库时，是否有一种很好的方法来执行代码？ 
 
 我在许多实体上都有一个Url属性。 如果一个URL没有明确给出，我想计算一个，因为该对象是持久的，例如： 
 
public void OnModelSaving()
{
    // If a URL has not been specified, generate one from the name.
    if (this.Url == null)
    {
        this.Url = Helper.GenerateSafeUrl(this.Title);
    }
}
 
 理想情况下，我希望所有代码都存储在模型中，但由于我没有EF拥有的基类/部分类，我怀疑如果可能的话，我必须在其他地方注册/连接它。 问题是 - 是否有可能，如果是这样，我该如何连接它？ 

Is there a nice way to execute code when an entity is being saved to the database using EF/code-first?
 
I have a Url property on many of my entities. If a URL has not been given explicitly, I would like to calculate one as the object is persisted, eg.:
 
public void OnModelSaving()
{
    // If a URL has not been specified, generate one from the name.
    if (this.Url == null)
    {
        this.Url = Helper.GenerateSafeUrl(this.Title);
    }
}
 
Ideally, I'd like all this code to be stored inside the Model, but since I don't have an EF-owned base/partial class, I suspect if it's possible, I'd have to register/wire it up elsewhere. Question is - is it possible, and if so, how do I wire it up?

原文：https://stackoverflow.com/questions/6008407