How to link progress change event to progress bar
I have windows form application that run a a class method by BackgroundWorker.
I would like to add the windows form a progress bar to show the progress.
in the class method I have a foreach loop so I would like each loop to send the form event
with the current percentage.
this is what i do :
and in the class i do this-
from some reason it dont work any idea?
I would like to add the windows form a progress bar to show the progress.
in the class method I have a foreach loop so I would like each loop to send the form event
with the current percentage.
this is what i do :
public partial class Form1 : Form
{
Parsser inst;
public Form1()
{
InitializeComponent();
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.WorkerSupportsCancellation = true;
inst = new Parsser( backgroundWorker1);
}
private void button2_Click(object sender, EventArgs e)
{
if (this.textBox1 != null & this.textBox2 != null)
{
if (backgroundWorker1.IsBusy != true)
{
// Start the asynchronous operation.
backgroundWorker1.RunWorkerAsync();
}
}
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
inst.init(this.textBox1.Text, this.textBox2.Text);
inst.ParseTheFile();
System.Windows.Forms.MessageBox.Show("Parsing finish successfully");
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.progressBar1.Value = e.ProgressPercentage;
}
}
}and in the class i do this-
public Parser(BackgroundWorker bg)
{
bgReports = bg;
}
public void ParseTheFile()
{
Lines = File.ReadAllLines(FilePath);
this.size = Lines.Length;
foreach (string line in Lines)
{
bg.ReportProgress(allreadtchecked/size);from some reason it dont work any idea?
Carlos Villegas
Hello, your code must work, just an observation, in your Parser class initialization you set bgReports = bg; but in your ParseTheFile method you call bg.ReportProgress instead of bgReports.ReportProgress, also, be sure that your reported progress is less or equal to your progressbar1.Maximum property
Oh that is the problem:
it must be by default of your progress bar between 0 to 100, and allreadtchecked/size sure is returning always 0 because are int.
bg.ReportProgress(allreadtchecked/size);it must be by default of your progress bar between 0 to 100, and allreadtchecked/size sure is returning always 0 because are int.
ASKER CERTIFIED SOLUTION
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Also, line #34, your "finished" message, should be in the RunWorkerCompleted() event of the BackgroundWorker().
I also wouldn't report progress for every single line as it will tax your main UI thread constantly updating. Consider reporting only every xxx lines read, or use a Timer and update the progress every xxx milliseconds (maybe 500?).
ASKER
I am sorry but the issue is that the program never get to the
private void backgroundWorker1_Progress
{
this.progressBar1.Value = e.ProgressPercentage;
}
private void backgroundWorker1_Progress
{
this.progressBar1.Value = e.ProgressPercentage;
}
Hello, in your backgroundWorker1 properties window, be sure that ProgressChanged event is set to backgroundWorker1_Progress
Did you wire up that event via the IDE?
You can also wire it up in code:
You can also wire it up in code:
public Form1()
{
InitializeComponent();
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.WorkerSupportsCancellation = true;
inst = new Parsser( backgroundWorker1);
backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged); // <--- wire up the ProgressChanged() event!
}