以委托作为值的字典

我有以下课程

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

    }

我想要一个带有映射的字典，每个参数类型都将映射到它的实现函数：Heartbeat 将映射到public int Visit(Heartbeat element)

我想做类似以下的事情：

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

我应该用什么代替“这里应该有什么？”以及“我怎么把它放在这里？”

Thanks

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

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