Question

I’m fighting with MEF and I stopped at some problem – in my App I have singleton class:

class Config: IConfig {
}

which stores App config data – loaded for example from XML files, DB etc

Now I have some plugins which must have access to the Config – so I wonder what is the best solution to pass the Config to plugin?

My solution for now is:

[ImportMany(typeof (IFieldPlugin))]
public IEnumerable<Lazy<IFieldPlugin, IFieldPluginData>> fieldPlugins;


foreach (var plugin in PluginsStorage.Instance.fieldPlugins)
{
    if (plugin.Metadata.Name.Equals(field.Plugin))
    {
        if(!plugin.IsValueCreated) {
            plugin.Value.Config = Config.Instance;
        }
        result = plugin.Value.DoStep(this,url);
    }
}

Any better solution?

Answer 1

What about creating an instance of the Config class early in the lifecycle of the application and export from there?

Can then import in constructor or as a property.