datagridview 11添加二维表头

代码

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    class  DataGridViewHelper
    {
         public  DataGridViewHelper(DataGridView gridview)
        {
            gridview.CellPainting  +=   new  DataGridViewCellPaintingEventHandler(gridview_CellPainting);
        }
         int  top  =   0 ;
         int  left  =   0 ;
         int  height  =   0 ;
         int  width1  =   0 ;
         void  gridview_CellPainting( object  sender, DataGridViewCellPaintingEventArgs e)
        {
             #region  重绘datagridview表头
            DataGridView dgv  =  (DataGridView)(sender);
             if  (e.RowIndex  !=   - 1 )  return ;
             foreach  (TopHeader item  in  Headers)
            {
                 if  (e.ColumnIndex  >=  item.Index  &&  e.ColumnIndex  <  item.Index  +  item.Span)
                {
                     if  (e.ColumnIndex  ==  item.Index)
                    {
                        top  =  e.CellBounds.Top;
                        left  =  e.CellBounds.Left;
                        height  =  e.CellBounds.Height;
                    }
                     int  width  =   0 ;
                     for  ( int  i  =  item.Index; i  <  item.Span  + item.Index ; i ++ )
                    {
                        width  +=  dgv.Columns[i].Width;
                    }

                    Rectangle rect  =   new  Rectangle(left, top, width, e.CellBounds.Height);
                     using  (Brush backColorBrush  =   new  SolidBrush(e.CellStyle.BackColor))
                    {
                         // 抹去原来的cell背景
                        e.Graphics.FillRectangle(backColorBrush, rect);
                    }

                     using  (Pen gridLinePen  =   new  Pen(dgv.GridColor))
                    {
                        e.Graphics.DrawLine(gridLinePen, left, top, left  + width , top);
                        e.Graphics.DrawLine(gridLinePen, left, top  +  height  /   2 , left  + width , top  +  height  /

     2 );
                        width1  =   0 ;
                        e.Graphics.DrawLine(gridLinePen, left , top , left , top  +  height);
                         for  ( int  i  =  item.Index; i  <  item.Span  +  item.Index; i ++ )
                        {
                            width1  += dgv.Columns[i].Width;
                            e.Graphics.DrawLine(gridLinePen, left  +  width1, top  +  height  /   2 , left  +  width1, top  +  height);
                       }

                        SizeF sf  =  e.Graphics.MeasureString(item.Text, e.CellStyle.Font);
                         float  lstr  =  (width  -  sf.Width)  /   2 ;
                         float  rstr  =  (height  /   2   -  sf.Height)  /   2 ;
                         // 画出文本框

                         if  (item.Text  !=   "" )
                        {
                            e.Graphics.DrawString(item.Text, e.CellStyle.Font,
                                                        new  SolidBrush(e.CellStyle.ForeColor),
                                                         left  +  lstr,
                                                         top  +  rstr,
                                                         StringFormat.GenericDefault);
                        }
                        width  =   0 ;
                        width1  =   0 ;
                         for  ( int  i  =  item.Index; i  <  item.Span  + item.Index ; i ++ )
                        {
                             string  columnValue  =  dgv.Columns[i].HeaderText;
                            width1  =  dgv.Columns[i].Width;
                            sf  =  e.Graphics.MeasureString(columnValue, e.CellStyle.Font);
                            lstr  =  (width1  -  sf.Width)  /   2 ;
                            rstr  =  (height  /   2   -  sf.Height)  /   2 ;

                             if  (columnValue  !=   "" )
                            {
                                e.Graphics.DrawString(columnValue, e.CellStyle.Font,
                                                            new  SolidBrush(e.CellStyle.ForeColor),
                                                             left  + width  +  lstr,
                                                             top  +  height  /   2   +  rstr,
                                                             StringFormat.GenericDefault);
                            }
                            width  +=  dgv.Columns[i].Width;
                        }

                    }

                    e.Handled  =   true ;
                }
            }


    
             #endregion
        }

         private  List < TopHeader >  _headers  =   new  List < TopHeader > ();
         public  List < TopHeader >  Headers
        {
             get  {  return  _headers; }
        }


         public   struct  TopHeader
        {
             public  TopHeader( int  index, int  span, string  text)
            {
                 this .Index  =  index;
                 this .Span  =  span;
                 this .Text  =  text;
            }
             public   int  Index;
             public   int  Span ;
             public   string  Text;
        }
    }
}

使用

  DataGridViewHelper helper = new DataGridViewHelper(dataGridView1);
            helper.Headers.Add(new DataGridViewHelper.TopHeader(0,2,"方案"));
            helper.Headers.Add(new DataGridViewHelper.TopHeader(2, 2, "方案3"));