datagridview 列 纵向合并 ,看了别人的源码拿过来自己搞搞

效果

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public override string ToString()
        {
            return Convert.ToString(base.ToString());
        }

        #region "合并单元格的测试"
        //private int? nextrow = null;
        //private int? nextcol = null;

        //  设置单元格内容显示格式
        private void dataGridView1_CellFormatting(object sender, System.Windows.Forms.DataGridViewCellFormattingEventArgs e)
        {
            //#region description
            //if (this.dataGridView1.Columns["description"].Index == e.ColumnIndex && e.RowIndex >= 0)
            //{
            //    if (this.nextcol != null & e.ColumnIndex == this.nextcol)
            //    {
            //        e.CellStyle.BackColor = Color.LightBlue;
            //        this.nextcol = null;
            //    }
            //    if (this.nextrow != null & e.RowIndex == nextrow)
            //    {
            //        e.CellStyle.BackColor = Color.LightPink;
            //        this.nextrow = null;
            //    }
            //    if (e.RowIndex != this.dataGridView1.RowCount - 1)
            //    {
            //        if (e.Value.ToString() == Convert.ToString(this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex + 1].Value))
            //        {
            //            e.CellStyle.BackColor = Color.LightPink;
            //            nextrow = e.RowIndex + 1;

            //        }
            //    }
            //}
            //#endregion

            //if (this.dataGridView1.Columns["name"].Index == e.ColumnIndex && e.RowIndex >= 0)
            //{
            //    // upd by liu
            //    if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString())
            //    {
            //        e.CellStyle.BackColor = Color.LightBlue;
            //        nextcol = e.ColumnIndex + 1;
            //    }
            //}
        }
        //==========================

        // 记录合并的行数
        static int rowcount = 0;
        //绘制单元格
        private void dataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e)
        {
            //纵向合并
            if (this.dataGridView1.Columns["description"].Index == e.ColumnIndex && e.RowIndex >= 0)
            {

                //初始两个笔刷，表格线设置为颜色为红色 就是我们要画的表格线
                using (
                    Brush gridBrush = new SolidBrush(Color.Red),//this.dataGridView1.GridColor
                     backColorBrush = new SolidBrush(e.CellStyle.BackColor)
                    )
                {
                    using (Pen gridLinePen = new Pen(gridBrush))
                    {
                        // 擦除原单元格背景
                        e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
                        /**/
                        ////绘制线条,这些线条是单元格相互间隔的区分线条,
                        ////因为我们只对列description做处理,所以datagridview自己会处理左侧和上边缘的线条
                        ////相邻单元格的值一样的话，就不在画下边缘的线，实现合并效果
                        if (e.RowIndex != this.dataGridView1.RowCount - 1)
                        {
                            if (e.Value.ToString() != Convert.ToString(this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value))
                            {
                                e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
                                e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线
                                //绘制值
                                if (e.Value != null)
                                {
                                    int heighty = e.CellBounds.Height / 2 * rowcount;
                                    e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
                                        Brushes.Crimson, e.CellBounds.X + 2,
                                        e.CellBounds.Y + 2 - heighty, StringFormat.GenericDefault);
                                    rowcount = 0;
                                }
                            }
                            else
                            {
                                rowcount++;
                            }
                        }
                        else
                        {
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
                                e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线

                            //绘制值
                            if (e.Value != null)
                            {

                                e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
                                    Brushes.Crimson, e.CellBounds.X + 2,
                                    e.CellBounds.Y + 2, StringFormat.GenericDefault);
                            }
                        }
                        //右侧的线
                        e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,
                            e.CellBounds.Top, e.CellBounds.Right - 1,
                            e.CellBounds.Bottom - 1);

                        e.Handled = true;
                    }
                }
            }

            #region//横向合并
            //if (this.dataGridView1.Columns["name"].Index == e.ColumnIndex && e.RowIndex >= 0)
            //{

            //    using (
            //        Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),
            //        backColorBrush = new SolidBrush(e.CellStyle.BackColor))
            //    {
            //        using (Pen gridLinePen = new Pen(gridBrush))
            //        {
            //            // 擦除原单元格背景
            //            e.Graphics.FillRectangle(backColorBrush, e.CellBounds);

            //            if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString())
            //            {

            //                //右侧的线
            //                e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top,
            //                    e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
            //                //绘制值
            //                if (e.Value != null)
            //                {
            //                    e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
            //                        Brushes.Crimson, e.CellBounds.X + 2,
            //                        e.CellBounds.Y + 2, StringFormat.GenericDefault);
            //                }
            //            }

            //            //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;
            //        }
            //    }

            //}
            #endregion

        }

        #endregion




        private void Form1_Load(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("description");
            dt.Columns.Add("name");
            dt.Columns.Add("sex");

            dt.Rows.Add("A", "cc", "1");
            dt.Rows.Add("A", "dd", "1");
            dt.Rows.Add("B", "dd", "0");
            dt.Rows.Add("A", "dd", "0");
            dt.Rows.Add("C", "dd", "0");
            dt.Rows.Add("A", "dd", "0");
            dt.Rows.Add("C", "dd", "0");

            // 不允许调整行高 用于合并行居中
            this.dataGridView1.AllowUserToResizeRows = false;
            this.dataGridView1.DataSource = dt;
            this.dataGridView1.Sort(this.dataGridView1.Columns["description"],ListSortDirection.Ascending);
            
            //  按和并列，排序
            //  dataGridView1.Columns["Column1"].HeaderCell.SortGlyphDirection = SortOrder.Ascending
            //  this.dataGridView1.Sort(this.dataGridView1.Columns["description"], ListSortDirection.Ascending);
            bool issort = false;

            //暂时只想到这个办法
            this.dataGridView1.Sorted += new EventHandler((xx, yy) =>
            {
                //this.dataGridView1.SortedColumn.SortMode = DataGridViewColumnSortMode.Automatic;
                //this.dataGridView1.Columns[1].SortMode = DataGridViewColumnSortMode.NotSortable;
                
                string col = this.dataGridView1.SortedColumn.Name;
                if (col == "description"||col=="")
                {
                    col = "";
                }
                else 
                {
                    col = "," + col;
                }
                // 重新指定排序规则
                // 在第一列默认排列顺序下，排列其他列
                DataView dv = dt.DefaultView;
                if (issort)
                {
                    dv.Sort = "description  "+col+" ASC";
                    issort = !issort;
                }
                else
                {
                    dv.Sort = "description  " + col + " DESC";
                    issort = !issort;
                }

                this.dataGridView1.DataSource = dv;
              //  this.dataGridView1.Columns[0].SortMode = DataGridViewColumnSortMode.Automatic;
               
            });



        }

   




    }
} 

1. Convert.ToString(this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value))

  原文直接.tostring().   当datagridview 启动添加行时,比较最后一行时会有错误.

2.不足:当选中单元格,或调整行高或其他操作,合并列的值会显示.

2. 只为简单记录随笔,别无它意.

代码:/Files/dayou123123/合并DataGridView.rar

原文:http://blog.csdn.net/csharp_start/archive/2007/09/30/1808000.aspx

更多:http://www.cnblogs.com/peterzb/archive/2009/05/29/1491891.html