Stopping further program execution.

[darren78]

Hi,

I have a windows form application that when I click on the run button, it passes to another class to perform some actions.

Within that class there is something that throws an exception caught within a try/catch block. If an exception is thrown and caught, then a messagebox shows up with two option : retry and cancel.
If the user clicks on retry, it simply retries the operation using DialogResult. However, when the user clicks cancel, I simply want the Messagebox to vanish and the program execution to stop.

That is to say, I don't want the application to close down, just that I don't want it to progress any further and the actual form is still visible to the user to allow them to do further operations.

Is there a simple method to do this?

Thanks,

Darren.

[DanFraser]

Really, all you need is an event.

public class tester
{
	public delegate void EndProgramEvent(object sender, EventArgs e);
	public event EndProgramEvent EndNow;

	public Tester()
	{
		
	}

	public void DoCalculations()
	{
		try
		{
			internalWork();
		}
		catch (Exception ex)
		{
			if(MessageBox.Show() == DialogResult.Retry)
			{
			}
			else
			{
				if(EndNow!=null)
				{
					EndNow(null,EventArgs.Empty);
				}
			}
		}
	}

	private void internalWork()
	{
		//  whatever work needs to be done is here
	}
}

// Form1 here

public partial class Form1
{
	tester testerclass = new tester();

	public Form1(){}

	// call this from your button event or add the lines in here to your button event
	public void StartCalculations()
	{
		testerclass.EndNow+=new EndProgramEvent(EndProgramNow);
		testerclass.DoCalculations();
	}

	public void EndProgramNow(object sender, EventArgs e)
	{
		// you could do anything here really, but this is something you could do
		Application.Exit();
	}
}

[darren78]

Thanks.

I'll have a try on that later, when I get back to that work.

[DanFraser]

Just noticed an error, the delegate goes in the namespace area, not a class.