How to Implement a BackgroundWorker with Progress Updates Using a ProgressBar?

Use progress bar to update background worker progress

Question:

How to use the ProgressBar control to implement a BackgroundWorker with progress updates?

Answer:

To correctly implement a BackgroundWorker with ProgressBar updates, follow these steps:

• In the DoWork event of BackgroundWorker, use the ReportProgress method to report progress periodically.
• In the ProgressChanged event, update the ProgressBar's value to show the reported progress on the UI thread.
• Set the BackgroundWorker's WorkerReportsProgress property to true to allow progress reporting.
• Use the RunWorkerAsync method to run the BackgroundWorker asynchronously.

The following is an example of a simple BackgroundWorker implementation that updates the ProgressBar control:

XAML code:

<ProgressBar Height="25" Margin="20" Maximum="50" Minimum="0" x:Name="myProgressBar"/>

Backend code:

using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;

public partial class MainWindow : Window
{
    BackgroundWorker backgroundWorker = new BackgroundWorker();

    public MainWindow()
    {
        InitializeComponent();

        backgroundWorker.WorkerReportsProgress = true;
        backgroundWorker.ProgressChanged += BackgroundWorker_ProgressChanged;
        backgroundWorker.DoWork += BackgroundWorker_DoWork;

        backgroundWorker.RunWorkerAsync();
    }

    private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        for (int i = 0; i < 50; i++)
        {
            System.Threading.Thread.Sleep(100); // 模拟工作
            backgroundWorker.ReportProgress(i);
        }
    }

    private void BackgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        myProgressBar.Value = e.ProgressPercentage;
    }
}

By following these steps, you can create a BackgroundWorker that integrates seamlessly with the GUI to provide progress updates to the user.

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