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POHow to use reflection and abstract objects to dynamically load classes?
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  1. POHow to use reflection and abstract objects to dynamically load classes?
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    copied!<p>I'm building a protocol handler. The protocol may support an unknown set of request types, and I will have a single class that implements each request type. These request handler classes will extend a base handler class. I'm trying to build the system such that in order to support a new request type, all I need to do is add a class for that and recompile/deploy/restart the service.</p> <p>So I have something like this:</p> <pre class="lang-cs prettyprint-override"><code>foreach (Type classType in protocolAssembly.GetTypes()) { if (classType.BaseType == typeof(ProtocolRequestHandler)) { if (supportedRequestsMap.Contains(classType.Method)) { // error: that method is already implemented! } supportedRequestsMap.Add(classType.Method, typeof(classType)); } } </code></pre> <p>Adding a new class is picked up when the service restarts, <em>as long as the request method it handles is declared.</em></p> <p>How can I enforce at compile time through through the base class <strong>ProtocolRequestHandler</strong> that property <strong>Method</strong> will be implemented? I don't want to use a method type as "Null" or "Unknown", or throw exceptions, and I don't want to specify the supported protocol request type inherently in the name of the extending classes (I would like to call the classes whatever I like). </p> <p>Is there some way I can enforce that a property has its value set in an inheriting class?</p> <p>Is there a cleaner way I can do this kind of dynamic loading? Should I be using attributes to determine the supported method of the inheriting class?</p>
 

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