Populate a tree from Hierarchical data using 1 LINQ statement
- by Midhat
Hi. I have set up this programming exercise.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication2
{
class DataObject {
public int ID { get; set; }
public int ParentID { get; set; }
public string Data { get; set; }
public DataObject(int id, int pid, string data) { this.ID = id; this.ParentID = pid; this.Data = data; }
}
class TreeNode {
public DataObject Data {get;set;}
public List<DataObject> Children { get; set; }
}
class Program
{
static void Main(string[] args)
{
List<DataObject> data = new List<DataObject>();
data.Add(new DataObject(1, 0, "Item 1"));
data.Add(new DataObject(2, 0, "Item 2"));
data.Add(new DataObject(21, 2, "Item 2.1"));
data.Add(new DataObject(22, 2, "Item 2.2"));
data.Add(new DataObject(221, 22, "Item 2.2.1"));
data.Add(new DataObject(3, 0, "Item 3"));
}
}
}
The desired output is a List of 3 treenodes, having items 1, 2 and 3. Item 2 will have a list of 2 dataobjects as its children member and so on.
I have been trying to populate this tree (or rather a forest) using just 1 SLOC using LINQ. A simple group by gives me the desired data but the challenge is to organize it in TreeNode objects.
Can someone give a hint or an impossibility result for this?
