Simple Source Line Counter in C# for C#

using System;
using System.IO;
using System.Collections;

namespace CSharpLineCounter
{
	public class CodeFileModel: blix.ListViewModel
	{
		#region Fields
		private string _SourceDirectory;
		private FileStatCollection _SourceFiles;
		private int _TotalLineCount;
		private int _SourceLineCount;
		private Brain _Brain;
		private bool _Thinking;

		private ModelSourceFileFoundDelegate _SourceFileFoundDelegate;
		#endregion

		#region CodeFileModel()
		public CodeFileModel()
		{
			Columns.Add(new blix.ListViewColumn("Name", typeof(string), 300));
			Columns.Add(new blix.ListViewColumn("Count", typeof(int), 50, blix.StandardTextAlignments.RightCenter));

			_SourceFiles = new FileStatCollection();
		}
		#endregion
		#region Populate(aSourceDirectory)
		public void Populate(string aSourceDirectory)
		{
			_Thinking = true;

			try
			{
				_SourceDirectory = aSourceDirectory;

				FindSourceFiles(_SourceDirectory);

				_SourceFiles.Sort();

				TriggerPopulated();
			}
			finally
			{
				_Thinking = false;
			}
		}
		#endregion
	
		#region FindSourceFiles
		public void FindSourceFiles(string aSourceDirectory)
		{
			string[] directories = Directory.GetDirectories(aSourceDirectory);

			if (directories.Length > 0)
			{
				foreach (string directory in directories)
					FindSourceFiles(directory);
			}

			string[] fileNames = Directory.GetFiles(aSourceDirectory, "*.cs");

			foreach (string fileName in fileNames)
			{
				FileStat fileStat = new FileStat(fileName);

				CountLines(fileStat);

				_SourceFiles.Add(fileStat);

				_SourceLineCount += fileStat.SourceLineCount;
				_TotalLineCount += fileStat.LineCount;

				TriggerSourceFileFound(fileStat);
			}	
		}
		#endregion
		#region CountLines
		private void CountLines(FileStat aFileStat)
		{
			StreamReader streamReader = new StreamReader(aFileStat.FileName);	

			try
			{
				while (streamReader.Peek() != -1)
				{
					string line = streamReader.ReadLine();

					line.Trim();

					aFileStat.LineCount++;

					if (_Brain.IsSource(line))
						aFileStat.SourceLineCount++;
				}
			}
			finally
			{
				streamReader.Close();
			}

			_Brain.Clear();
		}
		#endregion

		#region Clear
		public void Clear()
		{
			_SourceLineCount = 0;
			_TotalLineCount = 0;

			_SourceFiles.Clear();

			_SourceDirectory = String.Empty;

			TriggerRowsCleared();
		}
		#endregion
		#region GetRows
		public override System.Collections.IList GetRows()
		{
			return _SourceFiles;
		}
		#endregion
		#region GetRowValues
		public override System.Collections.IList GetRowValues(object aRow)
		{
			int index = _SourceFiles.IndexOf((FileStat) aRow);

			FileStat fileStat = _SourceFiles[index];

			ArrayList values = new ArrayList();

			values.Add(fileStat.Name);
			values.Add(fileStat.SourceLineCount);

			return values;
		}
		#endregion

		#region TotalLineCount
		public int TotalLineCount
		{
			get
			{
				return _TotalLineCount;
			}
		}
		#endregion
		#region SourceLineCount
		public int SourceLineCount
		{
			get
			{
				return _SourceLineCount;
			}
		}
		#endregion
		#region FileCount
		public int FileCount
		{
			get
			{
				return _SourceFiles.Count;
			}
		}
		#endregion

		#region SourceFileFound
		#region trigger SourceFileFound
		private void TriggerSourceFileFound(FileStat aFileStat)
		{
			if (_SourceFileFoundDelegate != null)
				_SourceFileFoundDelegate(aFileStat);
		}
		#endregion
		#region event SourceFileFound
		public event ModelSourceFileFoundDelegate SourceFileFound
		{
			add
			{
				_SourceFileFoundDelegate = (ModelSourceFileFoundDelegate) blix.Delegator.Add(_SourceFileFoundDelegate, value);
			}
			remove
			{
				_SourceFileFoundDelegate = (ModelSourceFileFoundDelegate) blix.Delegator.Remove(_SourceFileFoundDelegate, value);
			}
		}
		#endregion
		#endregion

		#region Brain
		public Brain Brain
		{
			get
			{
				return _Brain;
			}
			set
			{
				#region Precondition
				if (_Thinking)
					throw new Exception(GetType().FullName + "set_Brain(): Please do not swap my Brain while I'm thinking.");
				#endregion

				if (value == null)
					_Brain = new Simpleton();
				else
					_Brain = value;
			}
		}
		#endregion
	}
}