How to constrain generic type to must have a construtor that takes certain parameters?

Question

I have a wrapper generic class that intended to be used with a set of types. Those types are generated by a utility and are all derived from a base class ClientBase. While C

Answer 1

It's not possible. I'd like to see "static interfaces" to handle this, but don't expect them any time soon...

Alternatives:

• Specify a delegate to act as a factory for T
• Specify another interface to act as a factory for T
• Specify an interface on T itself for initialization (and add a constraint so that T implements the interface)

The first two are really equivalent. Basically you'd change your proxy class to something like this:

public class GenericProxy
    where T: ClientBase, new()
{
    string _configName;
    T _proxy;
    Func _factory;

    public GenericProxy(Func factory, string configName)
    {
        _configName = configName;
        _factory = factory;
        RefreshProxy();
    }

    void RefreshProxy() // As an example; suppose we need to do this later too
    {
        _proxy = _factory(_configName);
    }
}

(I assume you're going to want to create more instances later - otherwise you might as well pass an instance of T into the constructor.)