DataGridView 合并单元格

using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; using System.Collections; using System.Drawing; namespace OPSS.Logic.Checks { /// <summary> /// 对DataGridView进行合并操作的类 /// </summary> public class DGVOper { private static SortedList rowSpan = new SortedList();//取得需要重新绘制的单元格 private static string rowValue = "";//重新绘制的文本框内容 #region 单元格绘制 /// <summary> /// /// DataGridView合并单元格(横向) /// </summary> /// <param name="dgv">绘制的DataGridview </param> /// <param name="cellArgs">绘制单元格的参数（DataGridview的CellPainting事件中参数）</param> /// <param name="minColIndex">起始单元格在DataGridView中的索引号</param> /// <param name="maxColIndex">结束单元格在DataGridView中的索引号</param> public static void MerageRowSpan(DataGridView dgv, DataGridViewCellPaintingEventArgs cellArgs, int minColIndex, int maxColIndex) { if (cellArgs.ColumnIndex < minColIndex || cellArgs.ColumnIndex > maxColIndex) return; Rectangle rect=new Rectangle(); using (Brush gridBrush = new SolidBrush(dgv.GridColor), backColorBrush = new SolidBrush(cellArgs.CellStyle.BackColor)) { //抹去原来的cell背景 cellArgs.Graphics.FillRectangle(backColorBrush, cellArgs.CellBounds); } cellArgs.Handled = true; if (rowSpan[cellArgs.ColumnIndex] == null) { //首先判断当前单元格是不是需要重绘的单元格 //保留此单元格的信息，并抹去此单元格的背景 rect.X = cellArgs.CellBounds.X; rect.Y = cellArgs.CellBounds.Y; rect.Width = cellArgs.CellBounds.Width; rect.Height = cellArgs.CellBounds.Height; rowValue += cellArgs.Value.ToString(); rowSpan.Add(cellArgs.ColumnIndex, rect); if (cellArgs.ColumnIndex != maxColIndex) return; MeragePrint(dgv, cellArgs, minColIndex, maxColIndex); } else { IsPostMerage(dgv, cellArgs, minColIndex, maxColIndex); } } /// <summary> /// 不是初次单元格绘制 /// </summary> /// <param name="dgv"></param> /// <param name="cellArgs"></param> /// <param name="minColIndex"></param> /// <param name="maxColIndex"></param> public static void IsPostMerage(DataGridView dgv, DataGridViewCellPaintingEventArgs cellArgs, int minColIndex, int maxColIndex) { //比较单元是否有变化 Rectangle rectArgs = (Rectangle)rowSpan[cellArgs.ColumnIndex]; if (rectArgs.X != cellArgs.CellBounds.X || rectArgs.Y != cellArgs.CellBounds.Y || rectArgs.Width != cellArgs.CellBounds.Width || rectArgs.Height != cellArgs.CellBounds.Height) { rectArgs.X = cellArgs.CellBounds.X; rectArgs.Y = cellArgs.CellBounds.Y; rectArgs.Width = cellArgs.CellBounds.Width; rectArgs.Height = cellArgs.CellBounds.Height; rowSpan[cellArgs.ColumnIndex] = rectArgs; } MeragePrint(dgv,cellArgs,minColIndex,maxColIndex); } //画制单元格 private static void MeragePrint(DataGridView dgv, DataGridViewCellPaintingEventArgs cellArgs, int minColIndex, int maxColIndex) { int width = 0;//合并后单元格总宽度 int height = cellArgs.CellBounds.Height;//合并后单元格总高度 for (int i = minColIndex; i <= maxColIndex;i++ ) { width += ((Rectangle)rowSpan[i]).Width; } Rectangle rectBegin = (Rectangle)rowSpan[minColIndex];//合并第一个单元格的位置信息 Rectangle rectEnd = (Rectangle)rowSpan[maxColIndex];//合并最后一个单元格的位置信息 //合并单元格的位置信息 Rectangle reBounds = new Rectangle(); reBounds.X = rectBegin.X; reBounds.Y = rectBegin.Y; reBounds.Width = width - 1; reBounds.Height = height - 1; using (Brush gridBrush = new SolidBrush(dgv.GridColor), backColorBrush = new SolidBrush(cellArgs.CellStyle.BackColor)) { using (Pen gridLinePen = new Pen(gridBrush)) { // 画出上下两条边线，左右边线无 Point blPoint = new Point(rectBegin.Left, rectBegin.Bottom - 1);//底线左边位置 Point brPoint = new Point(rectEnd.Right - 1, rectEnd.Bottom - 1);//底线右边位置 cellArgs.Graphics.DrawLine(gridLinePen, blPoint, brPoint);//下边线 Point tlPoint = new Point(rectBegin.Left, rectBegin.Top);//上边线左边位置 Point trPoint = new Point(rectEnd.Right - 1, rectEnd.Top);//上边线右边位置 cellArgs.Graphics.DrawLine(gridLinePen, tlPoint, trPoint); //上边线 Point ltPoint = new Point(rectBegin.Left, rectBegin.Top);//左边线顶部位置 Point lbPoint = new Point(rectBegin.Left, rectBegin.Bottom - 1);//左边线底部位置 cellArgs.Graphics.DrawLine(gridLinePen, ltPoint, lbPoint); //左边线 Point rtPoint = new Point(rectEnd.Right - 1, rectEnd.Top);//右边线顶部位置 Point rbPoint = new Point(rectEnd.Right - 1, rectEnd.Bottom - 1);//右边线底部位置 cellArgs.Graphics.DrawLine(gridLinePen, rtPoint, rbPoint); //右边线 //计算绘制字符串的位置 SizeF sf = cellArgs.Graphics.MeasureString(rowValue, cellArgs.CellStyle.Font); float lstr = (width - sf.Width) / 2; float rstr = (height - sf.Height) / 2; //画出文本框 if (rowValue != "") { cellArgs.Graphics.DrawString(rowValue, cellArgs.CellStyle.Font, new SolidBrush(cellArgs.CellStyle.ForeColor), rectBegin.Left + lstr, rectBegin.Top + rstr, StringFormat.GenericDefault); } } cellArgs.Handled = true; } } #endregion } }

======================================================= 在DataGridView页面的DataGridView的CellPainting事件中写下下面代码就OK了 #region 统计行单元格绘制 private void dgConfirm_CellPainting(object sender, DataGridViewCellPaintingEventArgs e) { if (e.RowIndex!=-1 && dgConfirm.Rows[e.RowIndex].Cells[1].Value.ToString()==" " ) { e.CellStyle.Font = new Font(dgConfirm.DefaultCellStyle.Font, FontStyle.Bold); e.CellStyle.WrapMode = DataGridViewTriState.True; DGVOper.MerageRowSpan(dgConfirm, e, 1, 2); } //重绘统计行的选择框背景 if ((e.RowIndex == dgConfirm.Rows.Count - 1) && (e.ColumnIndex==0)) { Rectangle rect = new Rectangle(); rect.X = e.CellBounds.X; rect.Y = e.CellBounds.Y; rect.Width = e.CellBounds.Width; rect.Height = e.CellBounds.Height; e.Paint(rect,DataGridViewPaintParts.ContentBackground); e.PaintBackground(rect,false); e.Handled = true; } } #endregion