Create Event on Singleton Class

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Answers

  1. Martin

    • 2020/12/6

    What's the problem?

    public sealed class Singleton
    {
      ... your code ...
    
      public delegate LocationChangedEventHandler(object sender, LocationChangedEventArgs ea);  
    
      public event LocationChangedEventHandler LocationChanged;
    
      private void OnLocationChanged(/* args */)
      {
        if (LocationChanged != null)
          LocationChanged(this, new LocationChangedEventArgs(/* args */);
      }
    }
    
    public class LocationChangedEventArgs : EventArgs
    {
      // TODO: implement
    }
    

    Call OnLocationChanged whenever you want to fire the event.

  2. White

    • 2016/1/4

    What's the problem? public sealed class Singleton { your code public delegate LocationChangedEventHandler(object sender, 

  3. Zayne

    • 2021/8/5

    Create Event on Singleton Class. Ask Question Asked 10 years, 9 months ago. Active 10 years, 9 months ago. Viewed 3k times 0 I have a Windows Mobile 6.5 (.net cf 3.5

  4. Zaire

    • 2021/6/24

    Create Event on Singleton Class. I have a Windows Mobile 6.5 (.net cf 3.5) that uses a singleton class which follows this pattern: public sealed class 

  5. Holden

    • 2020/12/12

    You should just be able to do this as you would an event on any class.

    public event Action<object, EventArgs> LocationChanged;
    

    you can then have a protected virtual method such as:

    protected virtual void OnLocationChanged(EventArgs args)
    {
       if(LocationChanged != null)
       {
         LocationChanged(this, args);
       }
    }
    

    You can fire off your OnLocationChanged method where ever you need too and the event's you've attached will do their thing.

  6. Wesson

    • 2016/10/8

    The main difference between these two classes is an instantiation. To create an instance of a normal class, we use a constructor. On the other hand, to create an instance of a singleton class, we use getInstance () method. Generally, we use the class name as the method name. It avoids confusion.

  7. Malik

    • 2019/1/31

    I have a Windows Mobile 6.5 (.net cf 3.5) that uses a singleton class which follows this pattern:public sealed class Singleton{ static readonly Singleton 

  8. Bertrand

    • 2019/5/21

    Every class loader might load its version of the singleton. A singleton might be garbage-collected once no one holds a reference to it. This issue does not lead to the presence of multiple singleton instances at a time, but when recreated, the instance might differ from its previous version. 6. Conclusion

  9. Antonio

    • 2016/9/8

    The singleton instance of the event source. We have to create an instance to act as the event sink for VS, but since the derived class's events are exposed 

  10. Vihaan

    • 2016/6/3

    Another way would be to use a factory class that creates a singleton once. var SingletonFactory = (function(){ function SingletonClass() { } var instance; return { getInstance: function(){ if (!instance) { instance = new SingletonClass(); delete instance.constructor; } return instance; } }; })(); Copy.

  11. Ronald

    • 2019/12/30

    //method of the Interlocked class to see if the value is null. If it is null, then we. //will create the new object.

  12. Jack

    • 2016/4/20

    Constructor constructor = Singleton.class.getDeclaredConstructor(); This example shows how reflection can break the singleton pattern with Java reflect. You will get two hash codes, as shown below

  13. Hasani

    • 2015/12/3

    In my class ObjBehaviour at the beginning I write: Code (CSharp): It's a singleton, so make the event declaration static?

  14. Blaise

    • 2017/2/11

    Singleton could be used in cases where creating the instance of a class is expensive e.g. instantiating a class requires loading a lot of data from external sources.

  15. Cook

    • 2016/6/23

    In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to one "single" instance.

  16. Jabari

    • 2021/5/21

    I created a singleton class which extends object to handle all things related to geolocation. I added an EventDispatcher to that class to 

  17. Arjun

    • 2018/1/20

    In this article, learn what a Singleton Design Pattern is and how to implement a Singleton Pattern in C#.

  18. Pierce

    • 2015/8/9

    This article describes how to implement a Singleton design pattern in Apex. The Singleton pattern attempts to solve the issue where you are repeatedly using 

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