C# EventSource类代码示例

		public void TestGenericEvents()
		{
			var a = new EventSource();
			var e = new IncomingEvent<EventArgs> { Channel = "a", DataObject = new EventArgs { Id = 10 }, EventName = "foo" };
			(e as IncomingEvent).Data = "{id:10}";

			var events = new List<IIncomingEvent>();

			a.EventEmitted += (sender, evt) =>
				{
					Assert.AreEqual(evt.Channel, e.Channel);
					Assert.AreEqual(evt.Data, e.Data);
					Assert.AreEqual(evt.EventName, e.EventName);
					events.Add(evt);
				};

			a.GetEventSubscription<EventArgs>().EventEmitted += (sender, evt) =>
			{
				Assert.AreEqual(evt.Channel, e.Channel);
				Assert.AreEqual(evt.Data, e.Data);
				Assert.AreEqual(evt.DataObject.Id, e.DataObject.Id);
				Assert.AreEqual(evt.EventName, e.EventName);
				events.Add(evt);
			};

			a.EmitEvent(e);
			Assert.AreEqual(events.Count, 2, "Event should get through twice when you have two subscriptions");
		}

        public void WhenSourceEventRaised_ThenCollectedSubscriberIsNotNotified()
        {
            var source = new EventSource();
            var publisher = new EventPublisher(source);
            var subscriber = new EventSubscriber();

            var subscription = publisher.PropertyChanged.Subscribe(subscriber.OnChanged);

            try
            {
                subscriber = null;
                subscription.Dispose();
                GC.Collect();
                GC.WaitForFullGCApproach(-1);
                GC.WaitForFullGCComplete(-1);
                GC.WaitForPendingFinalizers();

                source.RaisePropertyChanged("Foo");

                Assert.Equal(0, EventSubscriber.ChangedProperties.Count);

            }
            finally
            {
                //subscription.Dispose();
            }
        }

 public TestEventSource(EventSource r)
 {
     if (r != null)
         source = r;
     else
         source = new EventSource();
 }

 public static TestEventSource BuildSourceFromDataBaseData(string idReferral)
 {
     using (NpgsqlConnection connection = Global.GetSqlConnection())
     {
         string findPatient = "SELECT is_referral_review_source_mo, referral_creation_date, planned_date, referral_out_date, referral_review_date_source_mo FROM public.referral WHERE id_referral = '" + idReferral + "'ORDER BY id_referral DESC LIMIT 1";
         NpgsqlCommand person = new NpgsqlCommand(findPatient, connection);
         using (NpgsqlDataReader personFromDataBase = person.ExecuteReader())
         {
             EventSource p = new EventSource();
             while (personFromDataBase.Read())
             {
                 if (personFromDataBase["is_referral_review_source_mo"] != DBNull.Value)
                     p.IsReferralReviewed = Convert.ToBoolean(personFromDataBase["is_referral_review_source_mo"]);
                 if (personFromDataBase["referral_creation_date"] != DBNull.Value)
                     p.ReferralCreateDate = Convert.ToDateTime(personFromDataBase["referral_creation_date"]);
                 if (personFromDataBase["planned_date"] != DBNull.Value)
                     p.PlannedDate = Convert.ToDateTime(personFromDataBase["planned_date"]);
                 if (personFromDataBase["referral_out_date"] != DBNull.Value)
                     p.ReferralOutDate = Convert.ToDateTime(personFromDataBase["referral_out_date"]);
                 if (personFromDataBase["referral_review_date_source_mo"] != DBNull.Value)
                     p.ReferralReviewDate = Convert.ToDateTime(personFromDataBase["referral_review_date_source_mo"]);
                 TestEventSource pers = new TestEventSource(p);
                 return pers;
             }
         }
     }
     return null;
 }

 protected override void OnEventSourceCreated(EventSource eventSource)
 {
     if (!this.Disabled)
     {
         this.EnableEvents(eventSource, EventLevel.LogAlways, (EventKeywords) ~0);
     }
 }

        protected override void OnEventSourceCreated(EventSource eventSource)
        {
            // There is a bug in the EventListener library that causes this override to be called before the object is fully constructed.
            // So if we are not constructed yet, we will just remember the event source reference. Once the construction is accomplished,
            // we can decide if we want to handle a given event source or not.

            // Locking on 'this' is generally a bad practice because someone from outside could put a lock on us, and this is outside of our control.
            // But in the case of this class it is an unlikely scenario, and because of the bug described above, 
            // we cannot rely on construction to prepare a private lock object for us.
            lock (this)
            {
                if (!this.constructed)
                {
                    if (this.eventSourcesPresentAtConstruction == null)
                    {
                        this.eventSourcesPresentAtConstruction = new List<EventSource>();
                    }

                    this.eventSourcesPresentAtConstruction.Add(eventSource);
                }
                else if (!this.Disabled)
                {
                    EnableEventSource(eventSource);
                }
            }
        }

        protected override void OnEventSourceCreated(EventSource eventSource)
        {
            if (eventSource.Name.StartsWith("Microsoft-ApplicationInsights-", StringComparison.Ordinal))
            {
                this.EnableEvents(eventSource, this.logLevel, (EventKeywords)AllKeyword);
            }

            base.OnEventSourceCreated(eventSource);
        }

 public void Log(EventSource eventSource, Exception exception, EventId eventId, EventLogEntryType logEntryType)
 {
     if (!EventLog.SourceExists(eventSource.ToString()))
     {
         EventLog.CreateEventSource(eventSource.ToString(), "TrainSurfer");
     }
     EventLog log = new EventLog();
     log.Source = eventSource.ToString();
     log.WriteEntry(FormatException(exception), logEntryType, (int)eventId);
 }

        public static int CreateEvent (EventSource eventSource, EventType eventType, int actingPersonId,
                                       int organizationId,
                                       int geographyId, int affectedPersonId, int parameterInt, string parameterText)
        {
            //TODO: organizationId comes in hardcoded as 1 from a lot of places, should probably be changed based on affected person
            // to the party for that country if not swedish.

            return SwarmDb.GetDatabaseForWriting().CreateEvent(eventSource, eventType, actingPersonId, organizationId,
                                                       geographyId, affectedPersonId, parameterInt, parameterText);
        }

        public void WhenWeakTargetCollected_ThenWeakReferenceNotAlive()
        {
            var source = new EventSource();
            var weak = new WeakReference(source);

            source = null;
            GC.Collect();

            Assert.False(weak.IsAlive);
        }

        /// <summary>
        /// Override this method to get a list of all the eventSources that exist.  
        /// </summary>
        protected override void OnEventSourceCreated(EventSource eventSource)
        {
            // Because we want to turn on every EventSource, we subscribe to a callback that triggers
            // when new EventSources are created.  It is also fired when the EventListner is created
            // for all pre-existing EventSources.  Thus this callback get called once for every
            // EventSource regardless of the order of EventSource and EventListener creation.

            // For any EventSource we learn about, turn it on.
            EnableEvents(eventSource, EventLevel.LogAlways, EventKeywords.All);
        }

		public void InstallerWillWireUpSubjectToPublicMethodInInternalListenerClass()
		{
			InternalListener listener = new InternalListener();
			EventSource source = new EventSource();
			ReflectionInstrumentationBinder binder = new ReflectionInstrumentationBinder();
			binder.Bind(source, listener);

			source.Fire();

			Assert.IsTrue(listener.callbackHappened);
		}

 public static void CreateActivistWithLogging (Geography geo, Person newActivist, string logMessage, EventSource evtSrc, bool isPublic, bool isConfirmed, int orgId)
 {
     PWEvents.CreateEvent(evtSrc,
         EventType.NewActivist,
         newActivist.Identity,
         orgId,
         geo.Identity,
         newActivist.Identity,
         0,
         string.Empty);
     newActivist.CreateActivist(isPublic, isConfirmed);
     PWLog.Write(newActivist, PWLogItem.Person, newActivist.Identity, PWLogAction.ActivistJoin, "New activist joined.", logMessage);
 }

        /// <summary>
        /// Initializes a new instance of the <see cref="BuildLogger"/> class.
        /// </summary>
        /// <param name="logger">The logger used by this instance. Can be <c>null</c>.</param>
        /// <param name="eventSource">The event source.</param>
        /// <exception cref="ArgumentNullException"><paramref name="eventSource"/> is <c>null</c>.</exception>
        internal BuildLogger(ILogger logger, EventSource eventSource)
        {
            if (eventSource == null)
            {
                throw new ArgumentNullException("eventSource");
            }

            this.eventSource = eventSource;
            if (logger != null)
            {
                Initialize(logger);
            }
        }

        /// <summary>
        /// Gets the <see cref="EventSchema"/> for the specified eventId and eventSource.
        /// </summary>
        /// <param name="eventId">The ID of the event.</param>
        /// <param name="eventSource">The event source.</param>
        /// <returns>The EventSchema.</returns>
        public EventSchema GetSchema(int eventId, EventSource eventSource)
        {
            Guard.ArgumentNotNull(eventSource, "eventSource");

            IReadOnlyDictionary<int, EventSchema> events;

            if (!this.schemas.TryGetValue(eventSource.Guid, out events))
            {
                events = new ReadOnlyDictionary<int, EventSchema>(this.schemaReader.GetSchema(eventSource));
                this.schemas[eventSource.Guid] = events;
            }

            return events[eventId];
        }