C# DynamicObject class methods

Question

Is there an easy way to create a class method for a subclass of a DyanamicObject or ExpandoObject?

Is resorting back to reflection the only way?

What I mean is something like :-

class Animal : DynamicObject {
}

class Bird : Animal {
}

class Dog : Animal {
}

Bird.Fly = new Action (()=>Console.Write("Yes I can"));

Bird.Fly in this case applying to the class of Bird rather than any specific instance.

It's not clear what you are trying to achieve. Please try to rephrase your question. I don't see how a method in a subclass and reflection are related. — Daniel Hilgarth
– Daniel Hilgarth, Commented Aug 21, 2012 at 14:24
Your question is very unclear. What do you mean on "class method"? Can you provide an example with some sample code? — nemesv
– nemesv, Commented Aug 21, 2012 at 14:24
Ok, they're called static methods usually. You'll probably be able to expand this. — phipsgabler
– phipsgabler, Commented Aug 21, 2012 at 14:38

jbtule · Accepted Answer · 2012-08-22 14:08:07Z

2

Nope, there are no dynamic class scoped methods. The closest thing you could do is have a dynamic singleton statically declared on the subclass.

class Bird : Animal {
    public static readonly dynamic Shared = new ExpandoObject();


}

Bird.Shared.Fly = new Action (()=>Console.Write("Yes I can"));

answered Aug 22, 2012 at 14:08

jbtule

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Comments

paulik · Accepted Answer · 2012-08-21 15:44:02Z

1

 public class Animal : DynamicObject
    {
        Dictionary<string, object> dictionary = new Dictionary<string, object>();

        public override bool TryGetMember(
        GetMemberBinder binder, out object result)
        {
            string name = binder.Name.ToLower();
            return dictionary.TryGetValue(name, out result);
        }

        public override bool TrySetMember(SetMemberBinder binder, object value)
        {
            dictionary[binder.Name.ToLower()] = value;
            return true;
        }
    }
    public class Bird : Animal
    {

    }

And then call it as your example:

dynamic obj = new Bird();
            obj.Fly = new Action(() => Console.Write("Yes I can"));

            obj.Fly();

For more info check DynamicObject

answered Aug 21, 2012 at 15:44

paulik

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1 Comment

Christophe De Troyer Over a year ago

You demonstrate how to add a method to an instance, however, the op asked for a way to add a method to a class definition.

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