Recursive Hierarchical Parent child

Question

I have a collection of items coming from a database which has a parentid value or null.

Here is my class design:

public class Item
{
public          


        

Answer 1

Do you really need a setter for sub items? Also be mindful of the performance issues when you run Select* queries on SQL server.

  public List SubItems{
  get
  {
   try{
        var validParents = db.items.Where(x=>x.ParentId!=null && x.ParentId.Equals(Id)); //db is your dbcontext
        if(validParents !=null)
        {
           return validParents.ToList(); 
        }else
        {
         return null;
        } 
        catch(Exception)
        {
          return null;
        }
   }

(Note: Think of adding this to your partial entity class. Never name your entity as "Item" :).Item is a reserved word. )