CODEWITHSUNDEEP
c#.net
Night Walker
Night Walker

Reputation: 21280

Dictionary with delegate as value

I have following class

public class CVisitor : IVisitor
    {
        public int Visit(Heartbeat element)
        {
            Trace.WriteLine("Heartbeat"); 
            return 1;
        }
        public int Visit(Information element)
        {
            Trace.WriteLine("Information"); 
             return 1;
        }

    }

I want to have a Dictionary with mappings, that every argument type will be mapped to it's implementation function:Heartbeat will be mapped to public int Visit(Heartbeat element)

I thought to do something like following:

    _messageMapper = new Dictionary<Type, "what should be here ?" >();
    _messageMapper.Add(typeof(Heartbeat), "and how I put it here?" );

what should I put instead "what should be here ?" and "and how I put it here?"

Thanks

Upvotes: 10

Views: 31242

Answers (3)

GameAlchemist
GameAlchemist

Reputation: 19294

Your best call here is to use Reflection.
1. Get all methods of Visitor Class (Or all methods called "Visit" ?) with typeof(Visitor).GetMethods().
2. GetMethods returns an IEnumerable of MethodInfo. GetParameters will give you the parameters for each Method.
3. So now you can build your Dictionnary of (Type, MethodInfo)
4. use Invoke to call the Method.

Rq : An advantage of using reflection is that the Dictionnary will still be up to date if you add a new method. No risk of forgetting to add a method.

Upvotes: 1

Serj-Tm
Serj-Tm

Reputation: 16981

new Dictionary<Type, Func<object, int>>();

var cVisitor = new CVisitor();
_messageMapper.Add(typeof(Heartbeat), 
   new Func<object, int>(heartbeat => cVisitor.Visit((Heartbeat)heartbeat)) 
);

Upvotes: 9

Mr.Pe
Mr.Pe

Reputation: 739

Do you know Action and Func objects? Seems like what you are looking for.

var d = new Dictionary<Type, Action>();
d.Add(typeof(HeartBeat), ()=>Trace.WriteLine("todum todum"));

PS: thx YAG

Upvotes: 3

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