Monitoring A Directory

August 14, 2009

Introduction

The subject of this article is a tad less modern than the previous two articles: WCF over HTTPS & MEF. Instead of focusing on a modern technology such as WCF or the upcoming Managed Extensibility Framework, I have a craving to write an article about the good ol’ FileSystemWatcher Class.

It’s been around since .NET 1.0 but the other day when I was composing the article about MEF it was brought back to my attention. MEF contains a DirectoryCatalog type, which allows you to specify a directory that contains assemblies that in turn contain extensions (exports) for your application.

In an earlier preview of MEF the DirectoryCatalog type automatically detected new assemblies placed inside of this directory and refreshed the loaded extensions. However this functionality has been dropped in favor of a Refresh() method which you have to call yourself. In other words you are now responsible for detecting new additions to said directory.

The main focus of this article is on how to use the FileSystemWatcher class type effectively for monitoring a directory for new, incoming files. Enough introductionary chit-chat, let’s get to the meat of it…

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IntroductionMEF

Yesterday, on a sunny sunday morning I was catching up on some blog reading. One post in particular caught my eye, namely A Whirlwind Tour Through The Managed Extensibility Framework by Bart De Smet.

The Managed Extensibility Framework, or MEF, is a new library that will eventually be part of the .NET 4.0 Framework. It enables you to easily create extensible applications that support a plugin model. A lot of modern, popular applications such as FireFox, Winamp, Visual Studio…etc. already provide a plugin / add-in model that allows you to add your own plugins if you want to extend the functionality of the application.

Making your application extensible in the past was certainly possible but you had to create the infrastructure from scratch. Well, no more! MEF allows you to expose certain parts of your application in which you can import built-in or external extensions.

Let’s discover the wonderful world of MEF by building a demo application…

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