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POPlugin Architecture with Interfaces; Interface check doesn't work
 

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  1. POPlugin Architecture with Interfaces; Interface check doesn't work
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    <p>I am implementing a simple plugin architecture in an application. The plugin requirements are defined using an interface (IPlugin) that is in a *.dll that is referenced by the application and the plugin. The application has a plugin manager (also in the same *.dll) which loads the plugins by looking for all the *.dll's in a plugins folder, loads them, then checks that the plugin implements the interface. I have done this checking two different ways [previously by a simple if (plugin is IPlugin)], but neither one will recognize when a plugin implements the interface. Here's the code:</p> <pre><code>Assembly pluginAssembly = Assembly.LoadFrom(currFile.FullName); if (pluginAssembly != null) { foreach (Type currType in pluginAssembly.GetTypes()) { if (currType.GetInterfaces().Contains(typeof(IPlugin))) { // Code here is never executing // even when the currType derives from IPlugin } } } </code></pre> <p>I used to test a particular class name ("Plugin"), but then I allowed it to cycle through all the classes in the assembly to no avail. (This follows an example that I found elsewhere.) To make this a little more complicated, there are two interfaces each of which implements the original interface (IPluginA, IPluginB). The plugin actually implements one of the more specific interfaces (IPluginB). However, I have tried it with the plugin just implementing the more general interface (IPlugin), and this still does not work.</p> <p>[Edit: in response to the two responses that I first received] Yes, I have tried using IsAssignableFrom. See the following:</p> <pre><code>Assembly pluginAssembly = Assembly.LoadFrom(currFile.FullName); if (pluginAssembly != null) { foreach (Type currType in pluginAssembly.GetTypes()) { if (typeof(IPlugin).IsAssignableFrom(currType)) { string test = "test"; } } } </code></pre>
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      1. USAbhishek B.
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    1. COA larger code sample would help understand the actual problem. I am pretty sure IsAssignableFrom is working for me, as I write this, in my app - exactly as expected.
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      1. USCharles Prakash Dasari
    2. COPlease check whether the currFile is the DLL containing plugins & also see what currType is for each of the types in the plugin assembly.
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      1. USshahkalpesh
    3. COThe currFile *is* the *.dll containing the plugin, and the currType is (the only type in the assembly), which is a Plugin which implements IPlugin. In other words, those are correct. Any other ideas?
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