2008-6-4 自定义DataGridView列-百分比进度条列

      DataGridView是Winform中最常用的控件之一，虽然它功能很强大，但是还是有一些功能没有提供，比如生成百分比的进度。代码如下：

public class DataGridViewProgressBarColumn : DataGridViewColumn
    {
        public DataGridViewProgressBarColumn()
            : base(new DataGridViewProgressBarCell())
        {
            
        }
    }

    public class DataGridViewProgressBarCell : DataGridViewCell
    {
        public DataGridViewProgressBarCell()
        {

        }

        //设置进度条的背景色；
        public DataGridViewProgressBarCell(Color progressBarColor)
            : base()
        {
            ProgressBarColor = progressBarColor;
        }

        protected Color ProgressBarColor = Color.Green; //进度条的默认背景颜色,绿色；

        protected override void Paint(Graphics graphics, Rectangle clipBounds, 
                                      Rectangle cellBounds, int rowIndex, 
                                      DataGridViewElementStates cellState, 
                                    object value, object formattedValue, 
                                    string errorText, DataGridViewCellStyle cellStyle, 
                                    DataGridViewAdvancedBorderStyle advancedBorderStyle, 
                                    DataGridViewPaintParts paintParts)
        {
            using(SolidBrush backBrush = new SolidBrush(cellStyle.BackColor))
            {
                graphics.FillRectangle(backBrush, cellBounds);
            }
            base.PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);

            using(SolidBrush brush = new SolidBrush(ProgressBarColor))
            {
                int num = (int) value;
                float percent = num / 100F;
                
                graphics.FillRectangle(brush, cellBounds.X, cellBounds.Y+1, cellBounds.Width * percent, cellBounds.Height - 3);

                string text=string.Format("{0}%", num);
                SizeF rf=graphics.MeasureString(text,cellStyle.Font);
                float x = cellBounds.X + (cellBounds.Width - rf.Width) / 2f;
                float y = cellBounds.Y+ (cellBounds.Height - rf.Height) / 2f;
                graphics.DrawString(text, cellStyle.Font, new SolidBrush(cellStyle.ForeColor),x,y);
            }
        }
    }

Demo运行界面如下图：