?
Solved

C# delegate and event

Posted on 2011-02-18
8
Medium Priority
?
352 Views
Last Modified: 2013-12-17
Hi,

I am not sure what this code means:

   public delegate void FirmwareDownloadProgressDelegate(object sender, int value);
   private event FirmwareDownloadProgressDelegate m_FirmwareDownloadProgress;

  public event FirmwareDownloadProgressDelegate FirmwareDownloadProgress
        {
            add    { m_FirmwareDownloadProgress += new FirmwareDownloadProgressDelegate(value); }
            remove { m_FirmwareDownloadProgress -= new FirmwareDownloadProgressDelegate(value); }
        }
These functions are defined in a class which I will instanstiate . How can I use the value?
I am new to C# ,please help
JT
0
Comment
Question by:jtran007
  • 4
  • 4
8 Comments
 
LVL 7

Expert Comment

by:dimaj
ID: 34929521
That code is basically defining an event that could be fired off by your class. Then, "clients" those who use this class, will be able to subscribe to your event and do some actions based on event's data.

You can get more info on this here: http://msdn.microsoft.com/en-us/library/aa645739(v=vs.71).aspx

That page has a good example on how to create and subscribe to an event.

Hope this helps.
0
 

Author Comment

by:jtran007
ID: 34929742
Hi ,

Suppose I am a client of this class, how do I subscribe to use this class event?
Could you please give me an example?
Thanks,
JT
0
 
LVL 7

Expert Comment

by:dimaj
ID: 34929777
sure...


Let's say that you have a class MyClass that has your delegate and an event defined.
In your class MyClient you'll say something like this:

MyClass.MyEventName += <name of a function that will handle your event>;

A hint, when you subscribe to an event, after you press +=, hit Tab key couple of times. Visual Studio will automatically create an event handler function for you based on the event you are subscribing to.
0
Never miss a deadline with monday.com

The revolutionary project management tool is here!   Plan visually with a single glance and make sure your projects get done.

 

Author Comment

by:jtran007
ID: 34930156
Hi,

So I can use like:

      void Adt42To45_FirmwareDownloadProgress(object sender, int value)
        {
             progressBar.Value = value;
        }

Is it correct since I could not the class now for the time being.

Also since my progressbar is in other form such as Form2, how can I access the progress bar
in this Form2. Could you please help since I have  due date on Monday?

Thanks,
JT
0
 
LVL 7

Expert Comment

by:dimaj
ID: 34934163
Is this the same question as you've asked on the Background Thread?
0
 

Author Comment

by:jtran007
ID: 34935633
Hi dimai,

Yes. it is correct.

JT
0
 
LVL 7

Accepted Solution

by:
dimaj earned 2000 total points
ID: 34935691
Ok, then I have posted done code there for you
0
 

Author Closing Comment

by:jtran007
ID: 34942982
Thanks,
JT
0

Featured Post

Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Native ability to set a user account password via AD GPO was removed because the passwords can be easily decrypted by any authenticated user in the domain. Microsoft recommends LAPS as a replacement and I have written an article that does something …
The PowerShell Core 6.0 of .NET release is just the beginning. The upcoming PowerShell Core 6.1 would have artificial intelligence and internet of things capabilities. So many things to look forward to in the upcoming release.
The goal of this video is to provide viewers with basic examples to understand opening and writing to files in the C programming language.
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use while-loops in the C programming language.
Suggested Courses

601 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question