Custom Event Handlers

• Download Event.zip - 1.1 KB

Introduction

I found it useful to use custom EventHandlers instead of framework's EventHandler and EventHandler<T> delegates.

1. Often I had a mistake of multiple assigns of same method to delegate what caused problems.
2. Calling UI thread from different thread is forbidden and problematic in framework and I found on internet nice solution that should be part of Event class for consistency.
3. I'd like to have nicer event calling mechanism without checking for null .

Solution : class Event.cs .

• Uses standard framework delegates EventHandler and EventHandler<T> so it can be easy used in interfaces interchangeable with standard events.
• Exception when duplicate method assign.
• Automatic using of ISynchronizeInvoke when calling UI thread.
• Uses standard framework EventArgs ;
• Serialization support (no attributes to bypass serialization needed)
• Event class contains also static methods for firing EventHandlers with support of ISynchronizeInvoke for UI firing from different thread. Syntax: Event.Fire(...); Event.SafeFire(...);

Using the code

       public event EventHandler MyEvent
        {
            add { myEvent+= value; }
            remove { myEvent -= value; }
        }   

 and in interface then standard : event EventHandler MyEvent; 

History

9 May 2007 - Initial release on Code Project.