C#视图模型：模型-->；Can'；我无法进行打字
我正在使用EF创建一个linq-to-sql模型，并且有一个运行良好的类，但是，我希望能够在使用EF进行更改时添加到该类中，而不让它们被覆盖，因此我相信我需要使用视图类的第二层 因此，我：C#视图模型：模型-->；Can'；我无法进行打字,c#,casting,viewmodel,subclass,superclass,C#,Casting,Viewmodel,Subclass,Superclass,我正在使用EF创建一个linq-to-sql模型，并且有一个运行良好的类，但是，我希望能够在使用EF进行更改时添加到该类中，而不让它们被覆盖，因此我相信我需要使用视图类的第二层 因此，我： public partial class People: INotifyPropertyChanging, INotifyPropertyChanged {...} // created by EF 然后我想做： public partial class ViewPeople: People { pu
public partial class People: INotifyPropertyChanging, INotifyPropertyChanged {...} // created by EF
public partial class ViewPeople: People {
public String someFunction() {...} // additional functionality
}
//select the person
NSDataContext dc = new NSDataContext(); // to get to the data context and models froM EF
var person = (from p in dc.Peoples where p.id == personID select p).First();
// pass model to view
return View((ViewPeople)person)
Andrew如果您从EF获得
PeopleViewPeople如果对象实际上是
ViewPeopleViewPeople相反，您需要为
ViewPeoplePeoplePeopleViewPeople如果对象实际上是
ViewPeopleViewPeople相反，您需要为
ViewPeoplePeoplepublic partial class People
{
public String someFunction() {...} // additional functionality
}
//select the person
NSDataContext dc = new NSDataContext(); // to get to the data context and models froM EF
ViewPeople person = (from p in dc.Peoples where p.id == personID select new ViewPeople(p)).First();
// pass model to view
return View(person)
当实体框架从数据库中获取的数据返回对象时，它创建的是人，而不是ViewPeople。这就解释了为什么不能投射对象。如果要向People类添加功能，可以将其添加到同一程序集中的另一个文件中：
public partial class People
{
public String someFunction() {...} // additional functionality
}
//select the person
NSDataContext dc = new NSDataContext(); // to get to the data context and models froM EF
ViewPeople person = (from p in dc.Peoples where p.id == personID select new ViewPeople(p)).First();
// pass model to view
return View(person)
你们的类名不应该是复数。他的表是
PeoplePeoplePeoplePeopleViewPeoplePeoplePeoplePeopleViewPeopleViewPeoplePeoplePeoplePeopleViewPeople