Page 150 - CSharp/C#

namespace BGWorkerExample
{
public partial class ExampleForm : Form
{

// the following creates an instance of the BackgroundWorker named "bgWorker"
BackgroundWorker bgWorker = new BackgroundWorker();

public ExampleForm() { ...

Using a BackgroundWorker to complete a task.

The following example demonstrates the use of a BackgroundWorker to update a WinForms
ProgressBar. The backgroundWorker will update the value of the progress bar without blocking
the UI thread, thus showing a reactive UI while work is done in the background.

namespace BgWorkerExample
{
public partial class Form1 : Form
{

//a new instance of a backgroundWorker is created.
BackgroundWorker bgWorker = new BackgroundWorker();

public Form1()
{
InitializeComponent();

prgProgressBar.Step = 1;

//this assigns event handlers for the backgroundWorker
bgWorker.DoWork += bgWorker_DoWork;
bgWorker.RunWorkerCompleted += bgWorker_WorkComplete;

//tell the backgroundWorker to raise the "DoWork" event, thus starting it.
//Check to make sure the background worker is not already running.
if(!bgWorker.IsBusy)
bgWorker.RunWorkerAsync();

}

private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
{
//this is the method that the backgroundworker will perform on in the background
thread.
/* One thing to note! A try catch is not necessary as any exceptions will terminate
the backgroundWorker and report
the error to the "RunWorkerCompleted" event */
CountToY();
}

private void bgWorker_WorkComplete(object sender, RunWorkerCompletedEventArgs e)
{
//e.Error will contain any exceptions caught by the backgroundWorker
if (e.Error != null)
{
MessageBox.Show(e.Error.Message);

https://riptutorial.com/ 96