C # event system (b)

　　As already mentioned about the design ideas now beginning to implement an event system. The so-called event system, in fact, is a collection of events. The event storing a unified management.

　　Event is one to many relationship, and I chose to represent a string events. HashSet used to store multiple delegate. That this Key / Value collection of natural selection dictionaries storage. Here we have not discussed the specific design commission. Let EventMethod with a class to represent.

 　   Implement the following code.

    /// <summary>
    /// 事件系统
    /// </summary>
    public class EventSystem
    {
        #region Field
        /// <summary>
        /// 事件容器
        /// </summary>
        private readonly Dictionary<string, HashSet<EventMethod>> events = new Dictionary<string, HashSet<EventMethod>>();
        #endregion

        #region Method
        /// <summary>
        /// 添加事件
        /// </summary>
        /// <param name = "EventMethod"> </ param> 
        public  BOOL the Add (EventMethod EventMethod) 
        { 
            // event in the set of methods that may be present is determined immediately, but is immediately deleted in another thread. So here 5 retries 
            for ( int = I 0 ; I < . 5 ; I ++ ) 
            { 
                // create a set of methods event 
                IF (! ) events.ContainsKey (eventMethod.Handle) 
                { 
                    Lock (events) 
                    { 
                        IF (! ) events.ContainsKey (eventMethod.Handle) 
                            events.Add (eventMethod.Handle, new new HashSet <EventMethod> ());
                    }
                } 
　　　　　　　　　 // add an event to the collection method of 
                IF (events.TryGetValue (eventMethod.Handle, OUT  var hashSet))
                     return hashSet.Add (EventMethod); 
            } 
            return  to false ;
             // the throw new new Exception ($ "Add Event {eventMethod.Handle failed}! "); 
        }
         ///  <Summary> 
        /// removal event
         ///  </ Summary> 
        ///  <param name =" EventMethod "> </ param> 
        public  void the remove (EventMethod EventMethod) 
        { 
            IF (events.TryGetValue (eventMethod.Handle,out  was hashSet)) 
            { 
                hashSet.Remove (EventMethod); 
                // remove event collection method has been vacant 
                IF (hashSet.Count <= 0 ) 
                    events.Remove (eventMethod.Handle); 
            } 
        } #endregion 
    }

　　EventMethod There is a property Hnadle he was commissioned to represent the kind of event so when added to implement the system adds it to the collection method corresponding event. Similarly removed.

　　A simple event container on the design better. Of course, now can not trigger, we design a good EventMethod after the trigger can be filled in. Back began to implement the event.

 

Portal:

　　　　C # event system (a)

　　　　C # event system (b)

　　　　C # event system (c)