How to wrap a static class in a non-static instance object (dynamically)

Question

I have an interesting problem. I need to wrap static classes dynamically. I.e. return a non-static instance to my callers. e.g.:

public object CreateInstance(string className) {
  Type t = assembly.GetType(className);
  if (IsStatic(t)) {
    return CreateStaticWrapper(t);
  } else {
    return Activator.CreateInstance(t);
  }
}

So what I need is pointers as to how to implement CreateStaticWrapper.

Note: I cannot use Dynamic objects unfortunately.

So what are my options? I'm not that keen on learning IL generation? If IL generation (Reflection.Emit, or is there other ways now?) is the way to go does anyone have pointers there?

Edit: It's important to note that I can return a Dictionary of Delegates. So I could use Delegate.CreateDelegate for this but I can't seem to work out how to handle overloaded methods and Generic methods.

Edit2: Another option would be to inject an empty constructor into the type using Emit, again any pointers? Is this even possible on a type marked as static? Does the static keyword make it into the IL?

Edit3: For a bit of context, I'm passing this to a javascript environment see: my project. So I would like to be able to (in JavaScript):

var fileHelper = .create('System.IO.File');
if (fileHelper.Exists(fileName)) { fileHelper.Delete(fileName); }

Thanks All.

Answer 1

Try creating a wrapper class which inherits from System.Dynamic.DynamicObject. In the wrapper class, use reflection to call the methods of the static class.

You need something like this:

public class StaticWrapper<T> : System.Dynamic.DynamicObject
{
    private static readonly Type t = typeof(T);
    public static int MyProperty { get; set; }
    public override bool TryInvokeMember(System.Dynamic.InvokeMemberBinder binder, object[] args, out object result)
    {
        try
        {
            result = t.InvokeMember(binder.Name, BindingFlags.Static | BindingFlags.Public, null, null, args);
            return true;
        }
        catch
        {
            result = null;
            return false;
        }
    }
    public override bool TryGetMember(System.Dynamic.GetMemberBinder binder, out object result)
    {
        try
        {
            var p = t.GetProperty(binder.Name);
            if (p != null)
                result = p.GetValue(null, null);
            else
            {
                var f = t.GetField(binder.Name);
                if (f != null) result = f.GetValue(null);
                else { result = null; return false; }
            }
            return true;
        }
        catch
        {
            result = null;
            return false;
        }
    }
    public override bool TrySetMember(System.Dynamic.SetMemberBinder binder, object value)
    {
        try
        {
            var p = t.GetProperty(binder.Name);
            if (p != null)
                p.SetValue(null, value, null);
            else
            {
                var f = t.GetField(binder.Name);
                if (f != null) f.SetValue(null, value);
                else return false;
            }
            return true;
        }
        catch (SystemException)
        {
            return false;
        }
    }
}

Hope it works.