csharp progress bar - accessing another components while progression

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Hi friends,

In my latest c sharp application, I use a progress bar to demonstrate the progression of a task, but the problem is during the progression I can not access other buttons or close window like tasks until the progress bar reaches the maximum value. plz help

thanks

Posted 28-Jan-10 0:16am

sreejith_g

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Tom Deketelaere · Accepted Answer · 2010-01-28T00:21:00

Solution 1

From the description your giving I suspect you don't use threads.
Without them your GUI will be locked for the duration of the progress so if you still want your GUI to respond you'll have to use threading.

Posted 28-Jan-10 0:21am

Tom Deketelaere

AspDotNetDev · Accepted Answer · 2010-01-28T00:35:00

Technically, you don't have to create a new thread. Instead, you can call Application.DoEvents() to force window messages (mouse clicks, key presses, and so on) to be processed. That would go something like this:

C#

// On a form with 2 buttons and a progress bar.
public partial class Form1 : Form
{
	bool closing = false;
	public Form1()
	{
		InitializeComponent();
	}
	private void button1_Click(object sender, EventArgs e)
	{
		for (int i = 0; i < 100; i++)
		{
			if (closing) break;
			progressBar1.Value = i;
			System.Threading.Thread.Sleep(100);
			Application.DoEvents();
		}
		if (!closing) MessageBox.Show("Done!");
	}
	private void button2_Click(object sender, EventArgs e)
	{
		MessageBox.Show("Did it");
	}
	private void Form1_FormClosing(object sender, FormClosingEventArgs e)
	{
		closing = true;
	}
}

However, I would recommend you learn how to use threads instead.

Nicholas Butler · Accepted Answer · 2010-01-28T00:47:00

Solution 3

Application.DoEvents() is EVIL because it causes re-entrancy. Do NOT use it!

This might help: http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx[^].

Nick

Posted 28-Jan-10 0:47am

Nicholas Butler