Calling child constructor by casting (ChildClass)parentObject; to track revisions
- by FreshCode
To track revisions of a Page class, I have a PageRevision class which inherits from Page and adds a revision ID (Guid RevisionID;).
If possible, how should I cast an existing Page object to a PageRevision and ensure that the PageRevision constructor is called to create a new revision ID?
I could could have a PageRevision(Page page) constructor which generates the Guid and copies all the Page attributes, but I want to automate it, especially if a Page class has many attributes (and I later add one, and forget to modify the copy constructor).
Desired use
Page page = new Page(123, "Page Title", "Page Body"); // where 123 is page ID
PageRevision revision = (PageRevision)page;
// now revision.RevisionID should be a new Guid.
Page, PageRevision classes:
public class Page
{
public int ID { get; set; }
public string Title { get; set; }
public string Body { get; set; }
}
public class PageRevision : Page
{
public Guid RevisionID { get; set; }
public PageRevision()
{
this.RevisionID = Guid.NewGuid();
}
}
