angel angel - 5 days ago 4
C# Question

How to use a BackgroundWorker?

I know it has 3 methods. In my program I have a method to send a message. It is often late and the program sometimes doesn't send the message at all in response to a button press. At times it is as late as 5 seconds from what I would expect and the program freezes. I want to use a backgroundworker to send the message as expected and allow the program to run normally at all times. I had the code for sending the message in a button handler. Now where do I put this equivalent code? I would like all of this to still be handled by a button press.

Is this the appropriate handler?

backgroundWorker1.RunWorkerAsync();


and in:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{}


I'm going to put my code in the button handler?
And this before:

carga.progressBar1.Minimum = 0;
carga.progressBar1.Maximum = 100;


Carga is my other form where the ProgressBar is. How do I use a BackgroundWorker in this scenario?

Answer

You can update progress bar only from ProgressChanged or RunWorkerCompleted event handlers as these are synchronized with the UI thread.

The basic idea is. Thread.Sleep just simulates some work here. Replace it with your real routing call.

public Form1()
{
    InitializeComponent();

    backgroundWorker1.DoWork += backgroundWorker1_DoWork;
    backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
    backgroundWorker1.WorkerReportsProgress = true;
}

private void button1_Click(object sender, EventArgs e)
{
    backgroundWorker1.RunWorkerAsync();
}

private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    for (int i = 0; i < 100; i++)
    {
        Thread.Sleep(1000);
        backgroundWorker1.ReportProgress(i);
    }
}

private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{
    progressBar1.Value = e.ProgressPercentage;
}
Comments