Question

Form with progressbar

Asked by: knowlton

I have a windows form with a progress bar.  I want to do the following:

1)Show the progress bar form
2)Run some lengthy process
3)Form shown has progressbar with style set to marque which run continuosly while Step 2 is running
4)Step 2 finishes
5)Progress bar form Hides.

The progressbar form does show, and with a call to Application.DoEvents() it refreshes the text and the progressbar control ....... but the marque does not run until the lengthy process finishes and the messagebox saying "Done!" appears.  THEN the marque starts running!!  I can tell because if I move the MessageBox over a bit...the ProgressBar form is there and the marquee is running!  But it does not run WHILE the lengthy process is running.

I'm horrible at threading.  I know that is probably what I need.

Can I run the progressbar form in it's own thread?


What is the best practice for creating a progress bar like this?

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Asked On
2009-10-21 at 09:51:11ID24831437
Topic

C# Programming Language

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Answers

 

by: knowltonPosted on 2009-10-21 at 09:53:17ID: 25625839

Some sample code.

ProgressBar form:
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace FinishPointLeadCollator
{
    public partial class WaitDialog : Form
    {
        public WaitDialog()
        {
            InitializeComponent();        
        }        
    }
}
                                              
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by: knowltonPosted on 2009-10-21 at 09:55:39ID: 25625862

The calling code:

private void buttonRunSQL_Click(object sender, EventArgs e)
        {
 
 
 
 
            WaitDialog wd = new WaitDialog();
            wd.Show();
            System.Windows.Forms.Application.DoEvents();
 
 
 
 
 
            try
            {
                _exportsqlstatement = this.textBoxCandidateSQL.Text.Trim();
 
                DataSet ds = DataHelper.ReturnDataSet(_exportsqlstatement);
                
                this.dataGridViewDataToExport.SuspendLayout();
                this.dataGridViewDataToExport.Columns.Clear();
                this.dataGridViewDataToExport.DataSource = ds.Tables[0];                
                this.dataGridViewDataToExport.ResumeLayout();
 
                labelCountOfItemsToExport.Text = "Row Count:  " + ds.Tables[0].Rows.Count.ToString();
 
                MessageBox.Show("Data has been selected based on your preferences and is ready for export");
            }
            catch (Exception eee)
            {
                DisplayErrorMessage(eee, "SQL error.");
            }
 
 
 
 
            wd.Hide();
 
 
 
        }

                                              
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by: knowltonPosted on 2009-10-21 at 13:25:05ID: 25627957

My eventual solution:

while (thread.IsAlive)
            {
                System.Windows.Forms.Application.DoEvents();                
            }

This made all the difference!

WaitDialog wd = new WaitDialog();
            wd.Show();
            ThreadStart method = new ThreadStart(this.RunSQLAndDisplayResults);
            Thread thread = new Thread(method);
            thread.Start();
 
            while (thread.IsAlive)
            {
                System.Windows.Forms.Application.DoEvents();                
            }
 
 
//LENGTHY PROCESS RUNNING HERE...
            this.dataGridViewDataToExport.SuspendLayout();
            this.dataGridViewDataToExport.Columns.Clear();
            this.dataGridViewDataToExport.DataSource = this._sqldataset.Tables[0];
            this.dataGridViewDataToExport.ResumeLayout();
 
            labelCountOfItemsToExport.Text = "Row Count:  " + this._sqldataset.Tables[0].Rows.Count.ToString();
 
            MessageBox.Show("Data has been selected based on your preferences and is ready for export");
 
            wd.Hide();
                                              
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