Question

C# on .NET 4.5:

 public Interface IMyInterface
    {
    public string DoSomething( string input1 )
    }

    public MyClass1 : IMyInterface
    {
    public string DoSomething( string input1 )
    {
    return "1";
    }
    }

    public MyClass2 : IMyInterface
    {
    public string DoSomething( string input1 )
    {
    return "2";
    }
    }

At runtime, I want to detect the hosting environment, set some kind of “global”, and then based on the global always instance and use MyClass1 or MyClass2. I do not want to have a single “MyClass” and then do lots of case logic inside it to detect the environment.

What is a good pattern or practice to do that? Is this actually a good place for Dynamics?

Thanks.

Answer 1

Seems like you need to use Factory. Create a method in Factory class to return MyClass object. Keep the return type of the method as IMyInterface. Within the method, you can execute your hosting logic and depending upon the output of hosting logic, instantiate proper class and return the reference to the object.