How can i create an interface in C# that has an arbitrary number of generic parameters ?

Question

So recently I have stumbled upon a youtube video(I'm not sure i can link it) about efficiency in c#, mainly writing efficient code for a unity engine game. So at some point in the video he showcases a struct that implements an interface with arbitrary number of generic parameters. Here is a picture to illustrate what he did:

The interface I am trying to replicate is the IJobsProcess. So what I got from what he said in the video is that the interface can take an arbitrary number of generic parameters. In conclusion how can i create an interface like that in c#? And please correct me if I said anything wrong here.

Answer 1

You can write and implement interface with any amount of generic parameters. But you cannot write interfaces with arbitrary amount of generic parameters.

Here is example for you:

interface IService<T1, T2>
{
    T1 GetValue();
    T2 GetAnotherValue();
}
class MyClass : IService<string, int>
{
    public int GetAnotherValue()
    {
        return 42;
    }

    public string GetValue()
    {
        return "Truth";
    }
}

As you see above, number of generic parameters can be more than 1, but that number is fixed in compile-time.

Same question is asked also here and here. In those questions there are mentioned few alternatives, where arbitrary amount of Type-parameters are implemented with other common known C#-features: with params keyword or passing array of types as parameter.