using System;

​

public interface ISomeHandler

{

    // this shouldn't be a `string` because I'd like the specific

    // handler, e.g. KubernetesHandler to have it's specific Client type

    // e.g. IKubernetes and so TerraformHandler would be ITerraform

    public string Client { get; init; }

    public void DoSomething();

}

​

​

public class KubernetesHandler : ISomeHandler

{

    public string Client { get; init; }

    public void DoSomething()

    {

        Console.WriteLine("Kubernetes does something");

    }

}

​

​

public class TerraformHandler : ISomeHandler

{

    public string Client { get; init; }

    public void DoSomething()

    {

        Console.WriteLine("Terraform does something");

    }

}

​

​

public class Program

{

    public static void Main()

    {

        // I'd like this `Handler` thing to only allow either Kubernetes or Terraform handlers

        var kube = IKubernetes; // pretend this is legit i.e. something that returns such that `kube` is now of type `IKubernetes`

        var terra = ITerraform; // pretend this is legit i.e. something that returns such that `terra`is now of type `ITerraform`

        var handler1 = new Handler(kube); // so it would accept this and return a new KubernetesHander

        var handler2 = new Handler(terra); // so it would accept this and return a new TerraformHandler

        var handler3 = new Handler(BlahBlah); // this would go "I only accept IKubernetes or ITerraform"

    }

}