How to Decouple Progress Bar Updates from External Calculations in C#?

Progress bar updates in C# handling unhindered external calculations

In some cases you may need to display progress for ongoing calculations performed in an external library. However, you want to decouple the calculation method from the progress bar's direct dependency.

Consider the following example:

<code class="language-c#">private void CaluculateAll(System.Windows.Forms.ProgressBar progressBar)
{
    progressBar.Maximum = 100000;
    progressBar.Step = 1;

    for (int j = 0; j < 100000; j++)
    {
        // Perform some calculation
        progressBar.PerformStep();
    }
}</code>

While this approach ensures progress reporting, it tightly ties the CaluculateAll method to the progress bar. To solve this problem, consider using the BackgroundWorker class:

<code class="language-c#">private void button1_Click(object sender, EventArgs e)
{
    progressBar1.Maximum = 100;
    progressBar1.Step = 1;
    progressBar1.Value = 0;
    backgroundWorker.RunWorkerAsync();
}

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
    var backgroundWorker = sender as BackgroundWorker;
    for (int j = 0; j < 100; j++)
    {
        // Perform some calculation
        backgroundWorker.ReportProgress(j);
    }
}

private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    progressBar1.Value = e.ProgressPercentage;
}</code>

This separation allows calculations to be performed independently of the UI while providing a mechanism for incremental progress reporting. BackgroundWorker handles the necessary threading and synchronization to prevent the interface from freezing during calculations.

By effectively using the BackgroundWorker, you can seamlessly update the progress bar without affecting the flexibility and decoupling of your codebase.

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