Progress Bar in C# Winforms App

Rich K

I have no trouble getting a progress bar to work in a sample c# winforms app when using a BackgroundWorker and doing something like this:

private void Form1_Load(object sender, EventArgs e)

{

// Start the BackgroundWorker

// Creates thread and DoWork method begins.

backgroundWorker1.RunWorkerAsync();

}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

{

for (int i = 1; i <= 100; i++)

{

// Wait 100 ms at each iteration in order to see the progress

Thread.Sleep(100);

// Report Progresss

backgroundWorker1.WorkerReportsProgress = true;

backgroundWorker1.ReportProgress(i);

}

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)

{

// Change the value of the ProgressBar to the BackgroundWorker progress.

progressBar1.Value = e.ProgressPercentage;

// Set the text of the titlebar

this.Text = e.ProgressPercentage.ToString();

}

but this just adds to the progress bar each time through the loop until reaching 100. In a real application though I want to start the progress bar when I select a file, then add progress to it until the entire process of retrieving data data from the file selected, build a sql query, executing the query and writing to a file completes. Since I'm not just adding to the bar each time through a loop I'm not sure how to go about doing this. Could anyone provide a real example?

Thanks

2 Replies

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Rich K12y ago
In my code I'm reading one file, querying a database and writing to another file. When I use your code, the file I'm writing gets written before the progress bar is done incrementing. Is there a way to make the progress bar increment until file processing is done and stop at the same time it is done?
Munesh Sharma12y ago
You can use timer.. See this simple example of progress bar..

Drag down a progress bar, a button and a timer. Now click on the button and write the code:

private void btnprogress_Click(object sender, EventArgs e)
{
this.timer1.start();
}

Now double click on timer

private void timer1_Click(object sender, EventArgs e)
{
this.btnprogress.increment(1);
}

We can also control the speed of the interval by a timer property.