Datagridview 实现二维表头和行合并
using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Drawing.Design; using System.Windows.Forms; /// <summary> /// DataGridView行合并.请对属性MergeColumnNames 赋值既可 /// </summary> public partial class RowMergeView : DataGridView { #region 构造函数 public RowMergeView() { SetStyle(ControlStyles.DoubleBuffer | ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true); UpdateStyles(); InitializeComponent(); } #endregion #region 重写的事件 protected override void OnPaint(PaintEventArgs pe) { // TODO: 在此处添加自定义绘制代码 // 调用基类 OnPaint base.OnPaint(pe); } protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e) { try { if (e.RowIndex > -1 && e.ColumnIndex > -1) { DrawCell(e); } else { //二维表头 if (e.RowIndex == -1) { if (SpanRows.ContainsKey(e.ColumnIndex)) //被合并的列 { //画边框 Graphics g = e.Graphics; e.Paint(e.CellBounds, DataGridViewPaintParts.Background | DataGridViewPaintParts.Border); int left = e.CellBounds.Left, top = e.CellBounds.Top + 2, right = e.CellBounds.Right, bottom = e.CellBounds.Bottom; switch (SpanRows[e.ColumnIndex].Position) { case 1: left += 2; break; case 2: break; case 3: right -= 2; break; } //画上半部分底色 g.FillRectangle(new SolidBrush(this._mergecolumnheaderbackcolor), left, top, right - left, (bottom - top) / 2); //画中线 g.DrawLine(new Pen(this.GridColor), left, (top + bottom) / 2, right, (top + bottom) / 2); //写小标题 var sf = new StringFormat { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center }; g.DrawString(e.Value + "", e.CellStyle.Font, Brushes.Black, new Rectangle(left, (top + bottom) / 2, right - left, (bottom - top) / 2), sf); left = this.GetColumnDisplayRectangle(SpanRows[e.ColumnIndex].Left, true).Left - 2; if (left < 0) left = this.GetCellDisplayRectangle(-1, -1, true).Width; right = this.GetColumnDisplayRectangle(SpanRows[e.ColumnIndex].Right, true).Right - 2; if (right < 0) right = this.Width; g.DrawString(SpanRows[e.ColumnIndex].Text, e.CellStyle.Font, Brushes.Black, new Rectangle(left, top, right - left, (bottom - top) / 2), sf); e.Handled = true; } } } base.OnCellPainting(e); } catch { } } protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e) { if (this.RowHeadersVisible) { var rectangle = new Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, this.RowHeadersWidth - 4, e.RowBounds.Height); TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), this.RowHeadersDefaultCellStyle.Font, rectangle, this.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Right); } base.OnRowPostPaint(e); } protected override void OnScroll(ScrollEventArgs e) { if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)// && e.Type == ScrollEventType.EndScroll) { timer1.Enabled = false; timer1.Enabled = true; } } #endregion #region 自定义方法 /// <summary> /// 画单元格 /// </summary> /// <param name="e"></param> private void DrawCell(DataGridViewCellPaintingEventArgs e) { if (e.CellStyle.Alignment == DataGridViewContentAlignment.NotSet) { e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter; } Brush gridBrush = new SolidBrush(this.GridColor); var backBrush = new SolidBrush(e.CellStyle.BackColor); var fontBrush = new SolidBrush(e.CellStyle.ForeColor); //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 (this.MergeColumnNames.Contains(this.Columns[e.ColumnIndex].Name) && e.RowIndex != -1) { int cellwidth = e.CellBounds.Width; var gridLinePen = new Pen(gridBrush); string curValue = e.Value == null ? "" : e.Value.ToString().Trim(); string curSelected = this.CurrentRow.Cells[e.ColumnIndex].Value == null ? "" : this.CurrentRow.Cells[e.ColumnIndex].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)) { //this.Rows[i].Cells[e.ColumnIndex].Selected = this.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected; 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)) { //this.Rows[i].Cells[e.ColumnIndex].Selected = this.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected; 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; } } 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) { 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; } } /// <summary> /// 画字符串 /// </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) { var fontBrush = new SolidBrush(e.CellStyle.ForeColor); var fontheight = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Height; var 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((String)e.Value, 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((String)e.Value, e.CellStyle.Font, fontBrush, e.CellBounds.X, e.CellBounds.Y + cellheight * DownRows - fontheight); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.BottomRight) { e.Graphics.DrawString((String)e.Value, 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((String)e.Value, 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((String)e.Value, 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((String)e.Value, 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((String)e.Value, 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((String)e.Value, e.CellStyle.Font, fontBrush, e.CellBounds.X, e.CellBounds.Y - cellheight * (UpRows - 1)); } else if (e.CellStyle.Alignment == DataGridViewContentAlignment.TopRight) { e.Graphics.DrawString((String)e.Value, e.CellStyle.Font, fontBrush, e.CellBounds.X + cellwidth - fontwidth, e.CellBounds.Y - cellheight * (UpRows - 1)); } else { e.Graphics.DrawString((String)e.Value, e.CellStyle.Font, fontBrush, e.CellBounds.X + (cellwidth - fontwidth) / 2, e.CellBounds.Y - cellheight * (UpRows - 1) + (cellheight * count - fontheight) / 2); } } #endregion #region 属性 /// <summary> /// 设置或获取合并列的集合 /// </summary> [MergableProperty(false)] [Editor("System.Windows.Forms.Design.ListControlStringCollectionEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))] [DesignerSerializationVisibility(System.ComponentModel.DesignerSerializationVisibility.Visible)] [Localizable(true)] [Description("设置或获取合并列的集合"), Browsable(true), Category("单元格合并")] public List<string> MergeColumnNames { get { return _mergecolumnname; } set { _mergecolumnname = value; } } private List<string> _mergecolumnname = new List<string>(); #endregion #region 二维表头 private struct SpanInfo //表头信息 { public SpanInfo(string Text, int Position, int Left, int Right) { this.Text = Text; this.Position = Position; this.Left = Left; this.Right = Right; } public readonly string Text; //列主标题 public readonly int Position; //位置，1:左，2中，3右 public readonly int Left; //对应左行 public readonly int Right; //对应右行 } private readonly Dictionary<int, SpanInfo> SpanRows = new Dictionary<int, SpanInfo>();//需要2维表头的列 /// <summary> /// 合并列 /// </summary> /// <param name="ColIndex">列的索引</param> /// <param name="ColCount">需要合并的列数</param> /// <param name="Text">合并列后的文本</param> public void AddSpanHeader(int ColIndex, int ColCount, string Text) { if (ColCount < 2) { throw new Exception("行宽应大于等于2，合并1列无意义。"); } //将这些列加入列表 int Right = ColIndex + ColCount - 1; //同一大标题下的最后一列的索引 SpanRows[ColIndex] = new SpanInfo(Text, 1, ColIndex, Right); //添加标题下的最左列 SpanRows[Right] = new SpanInfo(Text, 3, ColIndex, Right); //添加该标题下的最右列 for (int i = ColIndex + 1; i < Right; i++) //中间的列 { SpanRows[i] = new SpanInfo(Text, 2, ColIndex, Right); } } /// <summary> /// 清除合并的列 /// </summary> public void ClearSpanInfo() { SpanRows.Clear(); //ReDrawHead(); } //刷新显示表头 public void ReDrawHead() { foreach (int si in SpanRows.Keys) { this.Invalidate(this.GetCellDisplayRectangle(si - 1, -1, true)); } } private void timer1_Tick(object sender, EventArgs e) { timer1.Enabled = false; ReDrawHead(); } /// <summary> /// 二维表头的背景颜色 /// </summary> [Description("二维表头的背景颜色"), Browsable(true), Category("二维表头")] public Color MergeColumnHeaderBackColor { get { return this._mergecolumnheaderbackcolor; } set { this._mergecolumnheaderbackcolor = value; } } private Color _mergecolumnheaderbackcolor = System.Drawing.SystemColors.Control; #endregion }
需要新建一个组件类，拖放一个timer，你也可以不使用timer，直接把timer里面的方法放到调用的地方
使用：
DataTable dt = new DataTable(); dt.Columns.Add("1"); dt.Columns.Add("2"); dt.Columns.Add("3"); dt.Columns.Add("4"); dt.Rows.Add("中国", "上海", "5000", "7000"); dt.Rows.Add("中国", "北京", "3000", "5600"); dt.Rows.Add("美国", "纽约", "6000", "8600"); dt.Rows.Add("美国", "华劢顿", "8000", "9000"); dt.Rows.Add("英国", "伦敦", "7000", "8800"); this.rowMergeView1.DataSource = dt; this.rowMergeView1.ColumnHeadersHeight = 40; this.rowMergeView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing; this.rowMergeView1.MergeColumnNames.Add("Column1"); this.rowMergeView1.AddSpanHeader(2, 2, "XXXX");
PS：http://www.cnblogs.com/greatverve/archive/2012/03/05/multi-datagridview.html
缺点：只能二维，不能多维