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：

+ View Code?

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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。