IndentedTextWriterDemo.cs

using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace IndentedTextWriterDemo
{
    public class TodoItem
    {
        public string Description { get; private set; }

        public IList<TodoItem> SubTasks { get; private set; }

        public TodoItem(string description)
        {
            Description = description;
            SubTasks = new List<TodoItem>();
        }
    }

    internal class Program
    {
        public static void Main()
        {
            TodoItem[] todoList =
            {
                new TodoItem("Get milk"),
                new TodoItem("Clean house")
                {
                    SubTasks =
                    {
                        new TodoItem("Living room"),
                        new TodoItem("Bathrooms")
                        {
                            SubTasks =
                            {
                                new TodoItem("Guest bathroom"),
                                new TodoItem("Family bathroom")
                            }
                        },
                        new TodoItem("Bedroom")
                    }
                },
                new TodoItem("Mow the lawn")
            };

            using (var output = new StringWriter())
            using (var writer = new IndentedTextWriter(output))
            {
                WriteToDoList(todoList, writer);
                Console.WriteLine(output);
            }
        }

        private static void WriteToDoList(IEnumerable<TodoItem> todoItems, IndentedTextWriter writer)
        {
            foreach (var item in todoItems)
            {
                writer.WriteLine(" - {0}", item.Description);

                if (item.SubTasks.Any())
                {
                    writer.Indent++;
                    WriteToDoList(item.SubTasks, writer);
                    writer.Indent--;
                }
            }
        }
    }
}