DataGridView Progress Column works under XP but not under Vista or Windows 7...

Hi Guys.

I have written a DataGridViewProgressColumn which works absolutely perfectly under XP.  However, under Vista and 7 it does not update and stubbornly and resolutely stays blank!

The code that paints the cell is as follows:
        protected override void Paint(Graphics g, Rectangle clipBounds,
                                      Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState,
                                      object value,
                                      object formattedValue, string errorText, DataGridViewCellStyle cellStyle,
                                      DataGridViewAdvancedBorderStyle advancedBorderStyle,
                                      DataGridViewPaintParts paintParts)
        {
            int progressVal;

            if (value != null)
            {
                progressVal = (int)value;
            }
            else
            {
                progressVal = 0;
            }

            // Draws the cell grid
            base.Paint(g, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle,
                       advancedBorderStyle, (paintParts & ~DataGridViewPaintParts.ContentForeground));

            const int margin = 4;

            var pb = new ProgressBar
                         {
                             Height = 15,
                             Width = cellBounds.Right - cellBounds.Left - (margin*2),
                             Value = progressVal
                         };


            var bmp = new Bitmap(pb.Width, pb.Height);

            pb.DrawToBitmap(bmp, pb.ClientRectangle);

            g.DrawImage(bmp, new Point(cellBounds.X + margin, cellBounds.Y + margin));
        }

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Any suggestions would be appreciated
LVL 3
chrisbrayAsked:
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chrisbrayAuthor Commented:
Hi Veerabhadraiahhv:

Thanks for the suggestions.  Some of them have exactly the same problem as my implmentation, and the only one that has a hope of working is a dreadful kludge where the green bar representing the value is drawn over the top of the progress bar....

None of these explain WHY my code (and their code which is effectively the same) works under XP but NOT under 7.  If we knew WHY it doesn't work under 7 we would have a better chance of providing a proper resolution instead of a horrible kludge!

Any further suggestions?

Chris Bray
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chrisbrayAuthor Commented:
Hi Veerabhadraiahhv:

In the absence of any other input, I have worked on my own version of the horrible kludge suggested in one of your links.  It is still horrible, but having written my own version at least it works which is considerably more than you can say for the sample provided.  I would still like a proper solution, but this is better than nothing...

Important points to note:

I have kept the progress bar at a standard size.  Having a HUGE progress bar in a deep row just looks dreadful.
I have had to add a check for the OS in use.  If using XP the number of blocks displayed rounds up, so you can have part of a block sticking out of the end of the Vista style bar.  The code now checks the OS version and only draws the new bar under Vista or higher - for XP it simply displays the original progress bar which works properly under that OS.

Chris Bray
protected override void Paint(Graphics g, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
        {
            int progressVal;
            if (value != null)
            {
                progressVal = (int)value;
            }
            else
            {
                progressVal = 0;
            }

            // Draw the cell
            base.Paint(g, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle,
                (paintParts & ~DataGridViewPaintParts.ContentForeground));

            const int margin = 4;

            // Create a progress bar
            using (var pb = new ProgressBar
            {
                Height = 15,
                Style = ProgressBarStyle.Continuous,
                Width = cellBounds.Right - cellBounds.Left - (margin * 2),
                Value = progressVal
            })
            {
                if (pb.Width <= 0)
                {
                    pb.Width = 1;
                }

                int lHeight = pb.Height - margin;
                int lWidth = Convert.ToInt32(Math.Round(pb.Width * (progressVal / 100.0), 0 ,MidpointRounding.AwayFromZero));

                using (var bmp = new Bitmap(pb.Width, pb.Height))
                {
                    pb.DrawToBitmap(bmp, pb.ClientRectangle);
                    g.DrawImage(bmp, new Point(cellBounds.X + margin, cellBounds.Y + margin));

                    OperatingSystem osInfo = Environment.OSVersion;
                    if (osInfo.Platform != PlatformID.Win32NT || osInfo.Version.Major < 6)
                    {
                        return;
                    }

                    var barRectangle = new Rectangle(cellBounds.X + margin + 1, cellBounds.Y + 1 + (int)(margin * 1.5), lWidth - 1, lHeight);

                    if (barRectangle.Width <= 0)
                    {
                        barRectangle.Width = 1;
                    }

                    using (var myLinearGradientBrush = new LinearGradientBrush(barRectangle, Color.LightGreen,
                                                                               Color.MediumSeaGreen, LinearGradientMode.Vertical))
                    {
                        myLinearGradientBrush.SetBlendTriangularShape((float).5);
                        g.FillRectangle(myLinearGradientBrush, barRectangle);
                    }
                }
            }
        }

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chrisbrayAuthor Commented:
Don't know what happened here... I tried to allocate the points to Veerabhadraiahhv but the system raised a close request instead??

Can this be fixed please?
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chrisbrayAuthor Commented:
The links provided were mostly inappropriate, but a solution was reached (albeit not an ideal one) by doing something similar to a suggestion in one of the postings attached to one of the links provided.
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