Host-to-Plugin and Plugin-to-Host question

[LonnieTC]

Hello,

I am developing an application in which the host will load some Plugins and then call their start method.

I need to be able to do 2 things after loading a plugin:

1. Start the plugin in a thread so that it runs independent from the host. This is the case when the host is starting up a type of client CLI plugin or as Web server plugin.

2. I have learned how to call methods in plugins, but I am not sure how to call a set of host methods from a plugin. I think that this is in the interface but am not clear on how it is done.

Can you please assist with these 2 cases?
thanks

[LonnieTC]

Is there any update on this question?

[GammaSoul]

You would use Dependecy Injection to do this easily... i think there is an example in the samples

[Adam Dusty]

If you want to call a method in the host, wrap it in a Task.Run() call.

await Task.Run(plugin.Start);

If you want to call a method from the host assembly, you could have a function in your plugin that accepts a function, lambda, etc. as a sort of 'callback'.

public interface IPlugin{
    void RegisterCallback(Action funcFromHost);
}

public class Plugin : IPlugin {
    public Action FuncFromHost;
    public void RegisterCallback(Action funcFromHost) {
        this.FuncFromHost = funcFromHost;
    }
}

// In host
static async Main() {
    var plugin = ...;
    plugin.RegisterCallback(hostFunc);
    await Task.Run(plugin.Start);
}

I haven't tested this.

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