Catch button click event on different class

Question

I have a winforms applications which should be able to communicate with a custom device. I have a main window which has a button "Disconnect". I have a user control which handles the logging, and a class (SerialCom) which handles all communciation.

When I load the user control I also setup the com port in the SerialCom class. This class receives data, and sends it to the user control via INotifyPropertyChanged, see this question for more detail here.

I want to acces the class SerialCom from the MainForm, without having to new the SerialCom class. but the SerialCom class is first created on the user control. (so, if I new the SerialCom class from the MainForm, the serial port will not be open, so I cannot close it.)

Any tips on how to acces class A from class B and C without having to new class A again? I was thinking about passing the event between the forms, is this the best option?

there are many options here: you could pass a reference to the object from A to B, you could have a "program" class which is accessible by any form in your application. You could have a delegate for an event. You could use an observer/observable construction. The world is at your feet. :) — Bazzz
– Bazzz, Commented Nov 20, 2012 at 8:44
just expose SerialCom instance from your UserControl using property and add the event handler in your form. — Nikola Davidovic
– Nikola Davidovic, Commented Nov 20, 2012 at 8:54
@ThorstenDittmar thanks this did work, I tried this before but could not figure how to get it working, and now it does work perfectly fine :) Thanks! — 2pietjuh2
– 2pietjuh2, Commented Nov 20, 2012 at 9:01

Thorsten Dittmar · Accepted Answer · 2012-11-20 09:03:04Z

1

Turn your SerialCom class into a singleton. That way you have an instance that many classes can access. But please make sure to make this thread safe!

See this for making thread safe singletons.

answered Nov 20, 2012 at 9:03

Thorsten Dittmar

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2pietjuh2 Over a year ago

Thanks, I used the thread safe example from microsoft indeed. It works as expected :)

James Considine · Accepted Answer · 2012-11-20 09:03:30Z

1

Perhaps you are looking for a singleton. Basically, a single is an object that only allows a single instance to be initialised, and provides a mechanism (through static methods/properties) to access this instance from anywhere.

Here is a simple implementation that i found at the following link http://msdn.microsoft.com/en-us/library/ff650316.aspx

using System;

public class Singleton
{
   private static Singleton instance;

   private Singleton() {}

   public static Singleton Instance
   {
      get 
      {
         if (instance == null)
         {
            instance = new Singleton();
         }
         return instance;
      }
   }
}

answered Nov 20, 2012 at 9:03

James Considine

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1 Comment

J. Steen Over a year ago

Which it even says in the article. =D

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