C event with custom arguments

Question

I want to have an event that takes an enum only as the argument  For example  public enum MyEvents     Event1       how do I declare this to take enum MyEvents as argument public static event EventHandler EventTriggered   public static void Trigger MyEvent event         if  EventTriggered    null                EventTriggered event

User · Answer

I might be late in the game  but how about   public event Action lt MyEvent gt  EventTriggered   delegate        private void Trigger MyEvent e           EventTriggered e        Setting the event to an anonymous delegate avoids for me to check to see if the event isn t null   I find this comes in handy when using MVVM  like when using ICommand CanExecute Method

User · Answer

Here s a reworking of your sample to get you started    your sample has a static event - it s more usual for an event to come from a class instance  but I ve left it static below  the sample below also uses the more standard naming OnXxx for the method that raises the event  the sample below does not consider thread-safety  which may well be more of an issue if you insist on your event being static       public enum MyEvents        Event1      public class MyEventArgs   EventArgs       public MyEventArgs MyEvents myEvents                MyEvents   myEvents             public MyEvents MyEvents   get  private set       public static class MyClass        public static event EventHandler lt MyEventArgs gt  EventTriggered         public static void Trigger MyEvents myEvents                   OnMyEvent new MyEventArgs myEvents                 protected static void OnMyEvent MyEventArgs e                  if  EventTriggered    null                             Normally the first argument  sender  is  this  - but your example                 uses a static event  so I m passing null instead                  EventTriggered this  e                EventTriggered null  e

User · Answer

public enum MyEvents       Event1    public class CustomEventArgs   EventArgs       public MyEvents MyEvents   get  set        private EventHandler lt CustomEventArgs gt  onTrigger   public event EventHandler lt CustomEventArgs gt  Trigger       add               onTrigger    value            remove               onTrigger -  value           protected void OnTrigger CustomEventArgs e        if  onTrigger    null                onTrigger this  e

User · Answer

You need to declare a custom eventhandler   public class MyEventArgs  EventArgs            public delegate void MyEventHandler object sender  MyEventArgs e    public class MyControl  UserControl     public event MyEventHandler MyEvent

User · Answer

EventHandler receives EventArgs as a parameter  To resolve your problem  you can build your own MyEventArgs    public enum MyEvents         Event1       public class MyEventArgs   EventArgs        public MyEvents MyEvent   get  set         public static event EventHandler lt MyEventArgs gt  EventTriggered     public static void Trigger MyEvents ev            if  EventTriggered    null                   EventTriggered null  new MyEventArgs   MyEvent   ev

User · Answer

Example with no parameters   delegate void NewEventHandler    public event NewEventHandler OnEventHappens    And from another class  you can subscribe to   otherClass OnEventHappens    ExecuteThisFunctionWhenEventHappens    And declare that function with no parameters

User · Answer

You declare a delegate for the parameters   public enum MyEvents   Event1    public delegate void MyEventHandler MyEvents e    public static event MyEventHandler EventTriggered    Although all events in the framework takes a parameter that is or derives from EventArgs  you can use any parameters you like  However  people are likely to expect the pattern used in the framework  which might make your code harder to follow

[c#] C# event with custom arguments

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