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    <p>So you want to <strong>inherit</strong> all the functionalities of the <code>FileSystemWatcher</code>, while adding your properties? Try inheriting the class:</p> <pre><code>public class MyFileSystemWatcher : FileSystemWatcher { public string XmlConfigPath { get; set; } } </code></pre> <p>and after that you can use your new class on every place where you would use the <code>System.IO.FileSystemWatcher</code>, like this:</p> <pre><code>MyFileSystemWatcher fsw = new MyFileSystemWatcher(); fsw.XmlConfigPath = @"C:\config.xml"; fsw.Path = @"C:\Watch\Path\*.*"; </code></pre> <hr> <p>Another approach would be to make a class that will both have the config file location , and the FileSystemWatcher object as a property, along these lines:</p> <pre><code>public class MyFileSystemWatcherManager { public string XmlConfigPath { get; set; } public FileSystemWatcher Watcher { get; set; } public MyFileSystemWatcherManager() { Watcher = new FileSystemWatcher(); } } </code></pre> <p>and with usage like this:</p> <pre><code>MyFileSystemWatcherManager manager = new MyFileSystemWatcherManager(); manager.XmlConfigPath = @"C:\config.xml"; manager.Watcher.Path = @"C:\Watch\Path\*.*"; </code></pre> <p>Composition is possible even when the base class cannot be inherited, and it's generally preferred from an OO perspective, since most of the code that uses your class will rely only on your class, and not on the base class. However, when you do want to inherit <strong>all</strong> of the base behaviours and just add some (well-defined) extras, inheritance is the simpler and more tightly-coupled solution.</p>
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    1. POUsing .NET is it possible to assign a custom property to a built in object such as FileSystemWatcher?
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    1. POUsing .NET is it possible to assign a custom property to a built in object such as FileSystemWatcher?
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    1. COThis is correct, but I wonder if inheritance is the right answer. I suspect that it might be a better fit to create a class that *has* a FileSystemWatcher without *being* one.
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      1. USSteven Sudit
    2. CO@Steven Sudit: For the above question, I think that inheritance is the correct approach, composition would end up ugly (either mimicking the FSW behaviour with pass-through, or allowing access to the FSW directly),
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    3. COAgain, I don't know enough to say for sure, but my gut feeling is that a FSW that knows about a config file is doing something at a higher level. It's no longer a general-purpose FSW, and in fact may only use a limited subset of the functionality. As such, it might benefit from composition.
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