Using dynamic class/properties at runtime to load configuration

Question

I'm having a conundrum here, and I'm not even sure it's possible.

I'm developing a pluginbased application, where all the plugins will have access (read/write) to a shared configuration on the host application. There are easier ways of achieving the problem I'm presenting, but since this is a non-work related project, I'm free to play around :)

Let's say we have Plugin_A that is inheriting a PluginBase abstract class. The abstract class exposes a IConfiguration Config property that can be accessed by the plugin to write to this shared configuration. The IConfiguration Config is set properly by the host upon loading the plugin, to limit the available configuration that particular plugin will access.

What I would like to do is try and use the Dynamic keyword in C# 4.0 to seamlessly write the config-class.

in pseudo C# code here's what I would like to achieve

public class Plugin_A: PluginBase
{
   public void DoSomethingWithConfig()
   {
      ShowAMessageBox(Config.SomeMessage);
      Config.HasShownMessage = true;
   }
}

Now - in this example I don't want to actually define the .SomeMessage and .HasShownMessage but rather have them be dynamic and returned when called upon.

It seems like a stretch, but is this at all possible?

marr75 · Accepted Answer · 2010-08-30 08:02:00Z

3

I don't think you want to implement the IDynamicObject interface, I recommend you have Config inherit from DynamicObject instead. You'll want to override TryGetMember and TrySetMember at least for your example. TryInvokeMember will be necessary if you want to dynamically call methods. Implementing the whole interface is much more difficult.

So, your config class(es) will need to inherit DynamicObject and implement IConfiguration. You can then either declare the field as a dynamic item or as IConfiguration objects and cast them dynamic before you want to use their dynamic behaviors.

answered Aug 30, 2010 at 8:02

marr75

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marr75 Over a year ago

+1 @Timwi, didn't mean to step on your dynamic toes, I assumed you meant DynamicObject but IDynamicObject (which I believe is replaced by IDynamicMetaObjectProvider, although I couldn't find succinct documentation of this fact) is not for the faint of heart and attempting to implement GetMetaObject is harder and more generic than is needed for just about any purpose besides writing a library/framework.

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