Demonstrating Custom Attributes: Build An Assembly Searching Tool.

using System;
using DirectoryListerInterfaceNamespace;
using System.IO;

namespace DirectoryListerBaseNamespace
{
	/// <summary>
	/// Summary description for DirectoryListerBase.
	/// </summary>
	public class DirectoryListerBase : IDirectoryLister
	{
		#region Code pertaining to internal member data.
		string				m_strDirectoryToList;
		bool				m_bRecursive;
		DirectoryEntry		m_deRoot;
		#endregion

		#region Code pertaining to constructors and destructors.
		public DirectoryListerBase()
		{
			//
			// TODO: Add constructor logic here
			//
			InitMemberData();
		}
		#endregion

		#region Code pertaining to IDirectoryLister interface implementations

		public string DirectoryToList
		{
			get
			{
				return m_strDirectoryToList;
			}

			set
			{
				m_strDirectoryToList = value;
			}
		}

		public bool Recursive
		{
			get
			{
				return m_bRecursive;
			}
			set
			{
				m_bRecursive = value;
			}
		}

		public DirectoryEntry DirectoryEntry
		{
			get
			{
				return m_deRoot;
			}
		}

		public bool BeginListing()
		{
			if (m_strDirectoryToList == "")
			{
				return false;
			}

			m_deRoot.m_strName = m_strDirectoryToList;
			m_deRoot.m_lSize = 0;
			m_deRoot.m_dtLastModification = Directory.GetLastWriteTime(m_strDirectoryToList);

			GatherDirectories(m_strDirectoryToList, ref m_deRoot);

			return true;
		}

		#endregion

		#region Code pertaining to internal helper functions.
		protected virtual void InitMemberData()
		{
			m_strDirectoryToList = "";
			m_bRecursive = false;
		}

		protected virtual void GatherFiles(string strDirectoryName, ref DirectoryEntry directory_entry_to_set)
		{
			try
			{
				// Get all files from given directory name.
				string[]	strFileNames = Directory.GetFiles(strDirectoryName);
				int			iIndex = 0;

				directory_entry_to_set.m_feArray = new FileEntry[strFileNames.Length];

				foreach(string strFileName in strFileNames)
				{
					FileInfo fi = new FileInfo(strFileName);

					(directory_entry_to_set.m_feArray)[iIndex].m_strName = strFileName;
					(directory_entry_to_set.m_feArray)[iIndex].m_lSize = fi.Length;
					(directory_entry_to_set.m_feArray)[iIndex].m_dtLastModification = fi.LastWriteTime;

					iIndex++;
				}
			}
			catch(Exception e)
			{
				System.Console.WriteLine("Exception Message : {0}", e.Message);
				System.Console.WriteLine("Exception TargetSite : {0}", e.TargetSite);
				System.Console.WriteLine("Exception Source : {0}", e.Source);
			}
		}

		protected virtual void GatherDirectories(string strDirectoryName, ref DirectoryEntry directory_entry_to_set)
		{
			try
			{
				// First thing to do : gather all the files from the current directory.
				GatherFiles(strDirectoryName, ref directory_entry_to_set);

				string[]	strSubdirectoryNames = Directory.GetDirectories(strDirectoryName);
				int			iIndex = 0;

				// Next, gather all the sub-directories inside the current directory.
				directory_entry_to_set.m_deArray = new DirectoryEntry[strSubdirectoryNames.Length];

				iIndex = 0;
				foreach(string strSubdirectoryName in strSubdirectoryNames)
				{
					directory_entry_to_set.m_deArray[iIndex].m_strName = strSubdirectoryName;
					directory_entry_to_set.m_deArray[iIndex].m_lSize = 0;
					directory_entry_to_set.m_deArray[iIndex].m_dtLastModification = Directory.GetLastWriteTime(strSubdirectoryName);

					if (Recursive)
					{
						GatherDirectories(strSubdirectoryName, ref directory_entry_to_set.m_deArray[iIndex]);
					}

					iIndex++;
				}
			}
			catch(Exception e)
			{
				System.Console.WriteLine("Exception Message : {0}", e.Message);
				System.Console.WriteLine("Exception TargetSite : {0}", e.TargetSite);
				System.Console.WriteLine("Exception Source : {0}", e.Source);
			}
		}

		#endregion
	}
}