Modify Add Method in Entity Framework

Question

I'm new to entity framework technology and I just generated 3 classes from my tables:

• Project
• Resource
• Employees

I wanted to set a condition that the resource can't be used by two projects and I want that in my project's Add method how can I modify it, is it even possible to modify it?

public partial class Project
{
    public int Id { get; set; }
    public string Name { get; set; }
    public Nullable<int> Resource { get; set; }
    public Nullable<int> Manager { get; set; }
    public Nullable<System.DateTime> StartDate { get; set; }
    public Nullable<System.DateTime> Deadline { get; set; }
    public Nullable<System.DateTime> EndDate { get; set; }

    public virtual Emploee Emploee { get; set; }
    public virtual Resource Resource1 { get; set; }
}

Answer 1

You can modify it but it will override when you generate again. Add partial class and put your method there.

//Your partial class
public partial class Project
{

   public string DoCustomWork()
   {
   }

}

Answer 2

由于首先使用的是数据，因此，如果您希望资源对于单个项目是唯一的，则在项目表中的资源FK上创建唯一约束。