ProgressBar is slow in Windows Forms

Question

I\'m using Windows Vista and Visual Studio 2010. Create a .Net 4 Windows Forms Application. Drop a progress bar on the default form, add code to handle the form load event a

Answer 1

You can easily write a custom progress bar to show its value without animation. The following is a simple implementation to show the progress from 0 to 100 and revert to 0.

public class ProgressBarDirectRender : UserControl
{
    private int _value;
    public int Value
    {
        get { return _value; }
        set
        {
            if (value < 0 || value > 100)
                throw new ArgumentOutOfRangeException("value");
            _value = value;
            const int margin = 1;
            using (var g = CreateGraphics())
            {
                if (_value == 0)
                    ProgressBarRenderer.DrawHorizontalBar(g, ClientRectangle);
                else
                {
                    var rectangle = new Rectangle(ClientRectangle.X + margin,
                                                  ClientRectangle.Y + margin,
                                                  ClientRectangle.Width * _value / 100 - margin * 2,
                                                  ClientRectangle.Height - margin * 2);
                    ProgressBarRenderer.DrawHorizontalChunks(g, rectangle);
                }
            }
        }
    }
    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        ProgressBarRenderer.DrawHorizontalBar(e.Graphics, ClientRectangle);
    }
}