ExDataGridView 群组扩展 ...

DataGridView是非常强大的控件，当然有时他也不能满足我们现有的需求，当然我门就要对他进行扩展。 此控件我会逐步的扩展功能. 

先上图咱们来看看效果，当然处理方式不是最佳的忘提供建议，此群组样式为DevGridView样式。

解决方案,首先通过 public void BindingDataSource(DataTable dataTable, string group)  绑定数据员并设置群组合并列

分析数据群组信息，并将数据群组信息记录，通过群组数据重绘，将数据绑定控件。

放上重绘代码：

        protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e)
        {
            base.OnRowPostPaint(e);
            int rowIndex = 0;
            bool flag = false;
            string group = string.Empty;
            bool _curflag = false;
            foreach (GroupRows gr in this.GroupRowsColloce)
            {
                group = gr.GroupName;
                _curflag = gr.IsAllExpland;
                if (e.RowIndex == gr.GroupIndex)
                {
                    flag = true;
                    break;
                }
                if (e.RowIndex >= gr.GroupIndex)
                {
                    rowIndex++;
                }
            }
            if (!flag)
            {
                Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
                                                    e.RowBounds.Location.Y,
                                                    RowHeadersWidth - 4,
                                                    e.RowBounds.Height);
                TextRenderer.DrawText(e.Graphics,
                                      (e.RowIndex + 1 - rowIndex).ToString(),
                                      RowHeadersDefaultCellStyle.Font,
                                      rectangle,
                                      Color.Black,
                                      TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter);
            }
            else
            {
                e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(206, 206, 206)), new Rectangle(e.RowBounds.X, e.RowBounds.Y, e.RowBounds.Width, this.Height + 2));
                e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.FromArgb(220, 220, 220))), new Rectangle(e.RowBounds.X, e.RowBounds.Y, e.RowBounds.Width, this.Height + 2));
                if (_curflag)
                {
                    e.Graphics.DrawImage(Properties.Resources.sub,
                                       new Rectangle(e.RowBounds.X, e.RowBounds.Y + (e.RowBounds.Height - Properties.Resources.add.Width) / 2,
                                       Properties.Resources.add.Width,
                                       Properties.Resources.add.Height));
                }
                else
                {
                    e.Graphics.DrawImage(Properties.Resources.add,
                                        new Rectangle(e.RowBounds.X, e.RowBounds.Y + (e.RowBounds.Height - Properties.Resources.add.Width) / 2,
                                        Properties.Resources.add.Width,
                                        Properties.Resources.add.Height));
                }
                StringFormat stringFormat = new StringFormat();
                stringFormat.LineAlignment = StringAlignment.Center;
                e.Graphics.DrawString(group,
                                    new Font("宋体", 9),
                                    new SolidBrush(Color.Black),
                                    new Rectangle(e.RowBounds.X + Properties.Resources.add.Width + 2,
                                                  e.RowBounds.Y + 2,
                                                  e.RowBounds.Width,
                                                 e.RowBounds.Height),
                                    stringFormat);
            }
        }

　　控件的扩展都会提供给我门重构方法。我们只要通过重构|重绘都会得到我们想要的结果。