各位老大,事件无法被继承吗? 下面的代码无法实现啊,咋办呢

using System

namespace ConsoleApp
{

public delegate void MessageArriveDelegate(string name,System.DateTime time, string msg);

public class EventServer
{
public event MessageArriveDelegate msgArrive;

public virtual void EventTest()
{
     msgArrive("server",new DateTime(2003,12,12),"nihao");
}
}

public class EventServerChildrenA : EventServer
{
public override void EventTest()
{
       msgArrive("child A",new DateTime(2003,12,12),"nihao");

}
}

public class EventServerChildrenB : EventServer
{
public override void EventTest()
{
       msgArrive("child B",new DateTime(2003,12,12),"nihao");

}
}


public class EventClient
{
         public EventServer eventSource = new EventServerChildrenA() ;
public  EventClient()
{
         eventSource.msgArrive += new MessageArriveDelegate(OnMsgArrive);
}

public void EventHandleTest()
{
eventSource.EventTest();
}

public void OnMsgArrive(string name,System.DateTime time,string msg)
{
Console.WriteLine(name + msg);
}
}


class clsMain
{

[STAThread]
static void Main(string[] args)
{
    EventClient myTest = new EventClient()
             myTest.EventHandleTest();
          }
}
}