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Wait progress bar for long running UI operations

, 20 Sep 2011
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Showing progress bar while performing time consume processes.

Quite commonly, when working with WinForms, we perform time consume processes, for example, search on click, do some business logic, and delete entities from DB on some action.

This is the class you can add into the UI infrastructure for displaying the progress:

public class WaitIndicator : IDisposable
{
    ProgressForm progressForm;
    Thread thread;
    bool disposed = false; //to avoid redundant call
    public WaitIndicator()
    {
        progressForm = new ProgressForm();
        thread = new Thread(_ => progressForm.ShowDialog());
        thread.Start();
    }
 
    public void Dispose()
    {
        Dispose(true);
    }
 
    protected virtual void Dispose(bool disposing)
    {
        if (!disposed)
        {
            thread.Abort();
            progressForm = null;
        }
        disposed = true;
    }
}
 
class ProgressForm : Form
{
    public ProgressForm()
    {
        ControlBox = false;
        ShowInTaskbar = false;
        StartPosition = FormStartPosition.CenterScreen;
        TopMost = true;
        FormBorderStyle = FormBorderStyle.None;
        var progreassBar = new ProgressBar() { Style = ProgressBarStyle.Marquee, 
            Size = new System.Drawing.Size(200, 20), 
            ForeColor = Color.Orange, MarqueeAnimationSpeed = 40 };
        Size = progreassBar.Size;
        Controls.Add(progreassBar);
    }
}

and usage will be like:

using (new WaitIndicator())
{
    //code to process
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

kris444

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Comments and Discussions

 
GeneralRe: newly created thread is simply calling ShowDialog on instanc... Pinmemberkris44427-Oct-11 0:59 
newly created thread is simply calling ShowDialog on instance being created in UI thread, and this thread cant be involved Message loop...though this is called as UI thread?
GeneralRe: Yes you are missing alot. UI Elements normally function by s... PinmemberFZelle26-Sep-11 23:41 
GeneralYou'll generate cross-threading exceptions, or if not, your ... PinmemberBruce Lee Harrison18-Oct-11 10:41 
GeneralSo what (bad) actually happens when one uses more then one U... PinmemberNiemand2510-Oct-11 21:43 
GeneralReason for my vote of 1 Don't use another UI thread Pinmemberjohannesnestler21-Sep-11 4:24 
GeneralRe: Since many of the winform applications uses Thread model as ... Pinmemberkris44427-Oct-11 0:57 
GeneralWhat FZelle said is true: Yes there is a convention: Only on... Pinmemberjohannesnestler21-Sep-11 4:23 
GeneralReason for my vote of 1 This exactly how you shouldn't imple... PinmemberFZelle21-Sep-11 0:07 
GeneralRe: Hi When you say UI thread is it main thread you are pointing... Pinmemberkris44421-Sep-11 0:23 

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