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    <p>If you know each of the types you want to compare against, then use the <code>is</code> operator:</p> <pre><code>if (this is WorldListener) { // ... } else if (this is MasterListener) { // ... } </code></pre> <p>Alternatively, you could use <code>GetType</code> if you want a little more flexibility:</p> <pre><code>var type = GetType(); // Do some logic on the type to determine what to do next. </code></pre> <p>You should be careful with this approach, however; it's generally indicative of bad design that you need to explicitly check for types (as these <a href="http://www.antiifcampaign.com/" rel="nofollow noreferrer">lovely people</a> insist). Instead, it's almost always more appropriate to use polymorphism to delegate the desired behaviour to the base class (using a virtual or abstract method in the base class) – this is, after all, what it's designed for!</p> <p>You might apply polymorphism something like this:</p> <pre><code>static class Program { static void Main(string[] args) { Listener listener = new WorldListener(); listener.DoSomething(); } } abstract class Listener { public void DoSomething() { var output = Decorate("Did something!"); ConsoleWrapper.WriteLine(output); } protected abstract string Decorate(string input); } class WorldListener : Listener { protected override string Decorate(string input) { return string.Format("[World] {0}", input); } } class MasterListener : Listener { protected override string Decorate(string input) { return string.Format("[Master] {0}", input); } } </code></pre> <p>This will produce the output <code>[World] Did something!</code>. The advantage of this approach is that if you ever want to add another type of listener, it's simply a matter of defining a new class for it with the appropriate <code>Decorate</code> method; there's no need to modify <code>Listener</code> itself.</p>
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    1. POHow to determine which inheriting class is using an abstract class's methods
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    1. COGreat answer, wish I could choose more then one!
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    2. COWouldn't this cause me to have to delegate more to the inheriting classes? Almost all of the functions are re-used.
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    3. COIt's up to you how much you delegate; you could retain the bulk of the logic in `Listener` and just delegate the code for decorating the input (i.e. appending the `[World]` and `[Master]` tags).
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