How to use a variable as a method name using dynamic objects

Question

In SignalR there is public property defined in the HubConnectionContext as such:

public dynamic All { get; set; }

This enables users to cal

Answer 1

public void AcceptSignal(String methodToCall, String msg) {
    var count=(
        from target in new[] { Clients.All }
        from memberInfo in ((Type)target.GetType()).GetMember(methodToCall)
        where MemberTypes.Method==memberInfo.MemberType
        let methodInfo=memberInfo as MethodInfo
        let paraInfos=methodInfo.GetParameters()
        where null!=paraInfos.FirstOrDefault(x => msg.GetType()==x.ParameterType)
        select methodInfo.Invoke(target, new object[] { msg })
        ).Count();
}