多列数据绑定组合框?

问题描述

非常感谢.你能给我解释一下这些程序吗

Ok thnx very much. Can you explain me those procedures

protected override void OnMeasureItem(MeasureItemEventArgs e)
       {
           base.OnMeasureItem(e);

           if (DesignMode)
               return;

           for (int colIndex = 0; colIndex < columnNames.Length; colIndex++)
           {
               string item = Convert.ToString(FilterItemOnProperty(Items[e.Index], columnNames[colIndex]));
               SizeF sizeF = e.Graphics.MeasureString(item, Font);
               columnWidths[colIndex] = Math.Max(columnWidths[colIndex], sizeF.Width);
           }

           float totWidth = CalculateTotalWidth();

           e.ItemWidth = (int)totWidth;
       }

和

and

protected override void OnDrawItem(DrawItemEventArgs e)
{
    base.OnDrawItem(e);

    if (DesignMode)
        return;

    e.DrawBackground();

    Rectangle boundsRect = e.Bounds;
    int lastRight = 0;

    using (Pen linePen = new Pen(SystemColors.GrayText))
    {
        using (SolidBrush brush = new SolidBrush(ForeColor))
        {
            if (columnNames.Length == 0)
            {
                e.Graphics.DrawString(Convert.ToString(Items[e.Index]), Font, brush, boundsRect);
            }
            else
            {
                for (int colIndex = 0; colIndex < columnNames.Length; colIndex++)
                {
                    string item = Convert.ToString(FilterItemOnProperty(Items[e.Index], columnNames[colIndex]));

                    boundsRect.X = lastRight;
                    boundsRect.Width = (int)columnWidths[colIndex] + columnPadding;
                    lastRight = boundsRect.Right;

                    if (colIndex == valueMemberColumnIndex)
                    {
                        using (Font boldFont = new Font(Font, FontStyle.Bold))
                        {
                            e.Graphics.DrawString(item, boldFont, brush, boundsRect);
                        }
                    }
                    else
                    {
                        e.Graphics.DrawString(item, Font, brush, boundsRect);
                    }

                    if (colIndex < columnNames.Length - 1)
                    {
                        e.Graphics.DrawLine(linePen, boundsRect.Right, boundsRect.Top, boundsRect.Right, boundsRect.Bottom);
                    }
                }
            }
        }
    }

    e.DrawFocusRectangle();
}

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