datagridview 单元格合并：纵向以及横向合并参考了csdn上不知哪位的代码，具体哪位找不到连接了。
纵向合并：
/// <summary> /// 纵向合并,即合并数据项的值 /// </summary> /// <param name="e"></param> private void DrawCellVer(DataGridViewCellPaintingEventArgs e) { if (e.CellStyle.Alignment != DataGridViewContentAlignment.MiddleCenter) { e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter; } Brush gridBrush = new SolidBrush(this.GridColor); SolidBrush backBrush = new SolidBrush(e.CellStyle.BackColor); int cellwidth; //上面相同的行数 int UpRows = 0; //下面相同的行数 int DownRows = 0; //总行数 int count = 0; if (true) { cellwidth = e.CellBounds.Width; Pen gridLinePen = new Pen(gridBrush); //获取当前单元格的值，如果为null,就赋值为＂＂ string curValue = e.Value == null ? "" : e.Value.ToString().Trim(); if (!string.IsNullOrEmpty(curValue)) { #region 获取下面的行数 for (int i = e.RowIndex; i < this.Rows.Count; i++) { if (this.Rows[i].Cells[e.ColumnIndex].Value.ToString().Equals(curValue)) { DownRows++; if (e.RowIndex != i) { cellwidth = cellwidth < this.Rows[i].Cells[e.ColumnIndex].Size.Width ? cellwidth : this.Rows[i].Cells[e.ColumnIndex].Size.Width; } } else break; } #endregion #region 获取上面的行数 for (int i = e.RowIndex; i >= 0; i--) { if (this.Rows[i].Cells[e.ColumnIndex].Value.ToString().Equals(curValue)) { UpRows++; if (e.RowIndex != i) { cellwidth = cellwidth < this.Rows[i].Cells[e.ColumnIndex].Size.Width ? cellwidth : this.Rows[i].Cells[e.ColumnIndex].Size.Width; } } else break; } #endregion count = DownRows + UpRows - 1; if (count < 2) { return; } } else { //取下面看是否有为空的单元格,如果为最后一个为空的单元格，则画下边线 if (e.RowIndex < this.Rows.Count - 1) { if (this.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value != DBNull.Value) { if (!string.IsNullOrEmpty(this.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())) { DownRows = 1; } } } } if (this.Rows[e.RowIndex].Selected) { backBrush.Color = e.CellStyle.SelectionBackColor; //fontBrush.Color = e.CellStyle.SelectionForeColor; } //以背景色填充 e.Graphics.FillRectangle(backBrush, e.CellBounds); //画字符串 PaintingFont(e, cellwidth, UpRows, DownRows, count); if (DownRows == 1) { //画下面的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); count = 0; } // 画右边线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom); e.Handled = true; } } 横向合并：
/// <summary> /// 水平合并单元格，即数据头的合并 /// </summary> /// <param name="e"></param> private void DrawCellHor(DataGridViewCellPaintingEventArgs e) { if (e.CellStyle.Alignment != DataGridViewContentAlignment.MiddleCenter) { e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter; } Brush gridBrush = new SolidBrush(this.GridColor); SolidBrush backBrush = new SolidBrush(e.CellStyle.BackColor); int cellwidth; //前面相同的行数 int BefRows = 0; //后面相同的行数 int BehRows = 0; //总列数 int count = 0; if (true) { cellwidth = e.CellBounds.Width; Pen gridLinePen = new Pen(gridBrush); //获取当前单元格的值，如果为null,就赋值为＂＂ string curValue = e.Value == null ? "" : e.Value.ToString().Trim(); if (!string.IsNullOrEmpty(curValue)) { #region 获取后面的列数 for (int i = e.ColumnIndex; i < this.ColumnCount; i++) { if (this.Rows[e.RowIndex].Cells[i].Value.ToString().Equals(curValue)) { BehRows++; if (e.ColumnIndex != i) { cellwidth = cellwidth < this.Rows[e.RowIndex].Cells[i].Size.Width ? cellwidth : this.Rows[e.RowIndex].Cells[i].Size.Width; } } else break; } #endregion #region 获取前面的列数 for (int i = e.ColumnIndex; i >= 0; i--) { if (this.Rows[e.RowIndex].Cells[i].Value.ToString().Equals(curValue)) { BefRows++; if (e.ColumnIndex != i) { cellwidth = cellwidth < this.Rows[e.RowIndex].Cells[i].Size.Width ? cellwidth : this.Rows[e.RowIndex].Cells[i].Size.Width; } } else break; } #endregion count = BehRows + BefRows - 1; if (count < 2) { return; } } else { //取右边看是否有为空的单元格,如果为最后一个为空的单元格，则画右侧线 if (e.ColumnIndex < this.ColumnCount - 1) { if (this.Rows[e.RowIndex].Cells[e.ColumnIndex+1].Value != DBNull.Value) { if (!string.IsNullOrEmpty(this.Rows[e.RowIndex].Cells[e.ColumnIndex+1].Value.ToString())) { BehRows = 1; } } } } if (this.Rows[e.RowIndex].Selected) { backBrush.Color = e.CellStyle.SelectionBackColor; //fontBrush.Color = e.CellStyle.SelectionForeColor; } //以背景色填充 e.Graphics.FillRectangle(backBrush, e.CellBounds); //画字符串 HorPaintingFont(e, cellwidth, BefRows, BehRows, count); if (BehRows == 1) { //画右边缘的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom); count = 0; } // 画下边缘的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); e.Handled = true; } } 单元格写值纵向：
/// <summary> /// 绘制合并以后的值(纵向) /// </summary> /// <param name="e"></param> /// <param name="cellwidth"></param> /// <param name="UpRows"></param> /// <param name="DownRows"></param> /// <param name="count"></param> private void PaintingFont(System.Windows.Forms.DataGridViewCellPaintingEventArgs e, int cellwidth, int UpRows, int DownRows, int count) { if (e.Value != DBNull.Value) { stValue = e.Value.ToString(); } using (SolidBrush fontBrush = new SolidBrush(e.CellStyle.ForeColor)) { fontheight = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Height; fontwidth = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Width; int cellheight = e.CellBounds.Height; if (e.CellStyle.Alignment == DataGridViewContentAlignment.BottomCenter) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + (cellwidth - fontwidth) / 2, e.CellBounds.Y + cellheight * DownRows - fontheight); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.BottomLeft) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X, e.CellBounds.Y + cellheight * DownRows - fontheight); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.BottomRight) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + cellwidth - fontwidth, e.CellBounds.Y + cellheight * DownRows - fontheight); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.MiddleCenter) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + (cellwidth - fontwidth) / 2, e.CellBounds.Y - cellheight * (UpRows - 1) + (cellheight * count - fontheight) / 2); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.MiddleLeft) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X, e.CellBounds.Y - cellheight * (UpRows - 1) + (cellheight * count - fontheight) / 2); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.MiddleRight) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + cellwidth - fontwidth, e.CellBounds.Y - cellheight * (UpRows - 1) + (cellheight * count - fontheight) / 2); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.TopCenter) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + (cellwidth - fontwidth) / 2, e.CellBounds.Y - cellheight * (UpRows - 1)); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.TopLeft) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X, e.CellBounds.Y - cellheight * (UpRows - 1)); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.TopRight) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + cellwidth - fontwidth, e.CellBounds.Y - cellheight * (UpRows - 1)); } else { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X + (cellwidth - fontwidth) / 2, e.CellBounds.Y - cellheight * (UpRows - 1) + (cellheight * count - fontheight) / 2); } } } 单元格写值横向：
/// <summary> /// 水平方向写值 /// </summary> /// <param name="e"></param> /// <param name="cellwidth"></param> /// <param name="UpRows"></param> /// <param name="DownRows"></param> /// <param name="count"></param> private void HorPaintingFont(System.Windows.Forms.DataGridViewCellPaintingEventArgs e, int cellwidth, int UpRows, int DownRows, int count) { using (SolidBrush fontBrush = new SolidBrush(e.CellStyle.ForeColor)) { fontheight = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Height; fontwidth = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Width; int cellHeight = e.CellBounds.Height; if (e.Value != DBNull.Value) { stValue = e.Value.ToString(); } if (e.CellStyle.Alignment == DataGridViewContentAlignment.MiddleCenter) { e.Graphics.DrawString(stValue, e.CellStyle.Font, fontBrush, e.CellBounds.X - cellwidth * (UpRows - 1) + (cellwidth * count - fontwidth) / 2, e.CellBounds.Y + (cellHeight - fontheight) / 2); } } } 在次备忘一下。
原标题：datagridview 纵向 横向 合并单元格
关键词：GridView
我知道了 