Question

I have a button in a winform and on clicking which there will be some processing for say 5s.

during this process, I want to update the progress(ProgressBar) to UI with the % of work completed.

How to do this using Events & Delegates?

Other approaches(other than Events & Delegates) are also welcomed..

Answer 1

Pseudo code below. I don’t have the compiler at hand so the actual ProgressBar interface could differ slightly from what I remember.

// service

delegate void ProgressDelegate( int CurrentValue, int MaxValue );

void BusinessProcess( ProgressDelegate progress )
{
   // do something
   progress( 20, 100 );

   // do other things
   progress( 50, 100 );

   // do yet another thing
   progress( 100, 100 );
}

// client

void Button1_Click( object sender, EventArgs e )
{
   BusinessProcess(
      (current, max ) => 
      {
         this.ProgressBar1.Maximum = max;
         this.ProgressBar1.Value = current;
         this.ProgressBar1.Refresh();
      }
      );
}