DataGridView 多标题--update.....

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

namespace  JControl.WinForm
{
    public class JDataGrid : DataGridView
    {

        //private ScrollableControl m_ScrollableControl = null;
        
        private List<MergeTitle> m_MergeTitles = null;
        private List<int> m_EndCols = null;
        private Color m_BoundColor = Color.Black;
        public void AddMergeTitle(MergeTitle mergeTitle)
        {
            if (m_MergeTitles == null)
            {
                m_MergeTitles = new List<MergeTitle>();
                m_EndCols = new List<int>();
            }
            m_MergeTitles.Add(mergeTitle);
            m_EndCols.Add(mergeTitle.EndCol);
        }
        public void RemoveMergeTitle(int Index)
        {
            m_MergeTitles.RemoveAt(Index);
            m_EndCols.RemoveAt(Index);
        }
        [Category("MergeTitle"), Browsable(false), Description("设置合并单元标题")]
        public List<MergeTitle> MergeTitles
        {
            get{return m_MergeTitles;}
            set { m_MergeTitles = value; }
        }

        public Color BoundColor
        {
            get{return m_BoundColor;}
            set{m_BoundColor = value;}
        }
     
        protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
        {
            if (e.ColumnIndex > 0 && e.RowIndex == -1 &&
                this.Columns[e.ColumnIndex] is DataGridViewTextBoxColumn)
            {

                if (m_EndCols.Contains(e.ColumnIndex))
                {
                    foreach (MergeTitle mergeTitle in m_MergeTitles)
                    {
                        if (e.ColumnIndex == mergeTitle.EndCol)
                        {
                            this.DrawSingleMergeTitle(mergeTitle, e);
                        }
                    }

                }
            }
            base.OnCellPainting(e);
        }
        private void DrawSingleMergeTitle(MergeTitle mergeTitle,DataGridViewCellPaintingEventArgs e)
        {
            using
                (
                Brush gridBrush = new SolidBrush(m_BoundColor),
                backColorBrush = new SolidBrush(e.CellStyle.BackColor),
                ForeColorBrush = new SolidBrush(e.CellStyle.ForeColor)
                )
               {
                    int sizeWidth = 0;
                    for (int i = mergeTitle.StartCol; i <= mergeTitle.EndCol; i++)
                    {
                        sizeWidth += this.Columns[i].Width;
                    }
                    Size size = new Size(sizeWidth, this.ColumnHeadersHeight);
                    Point loct = new Point(e.CellBounds.X - sizeWidth+e.CellBounds.Width, e.CellBounds.Y);
                    RectangleF rectf = new RectangleF((PointF)loct, (SizeF)size);

                    e.Graphics.FillRectangle(backColorBrush, rectf);
                    //draw line & title
                    using (Pen gridLinePen = new Pen(gridBrush))
                    {
                       // LEFT
                        e.Graphics.DrawLine(gridLinePen, rectf.X, rectf.Y, rectf.X, rectf.Bottom);
                        //RIGHT
                        e.Graphics.DrawLine(gridLinePen, rectf.Right - 1, rectf.Y, rectf.Right - 1, rectf.Bottom);
                        //TOP
                        e.Graphics.DrawLine(gridLinePen, rectf.X, rectf.Y, rectf.Right, rectf.Y);
                        //BOTTOM
                        e.Graphics.DrawLine(gridLinePen, rectf.X, rectf.Y + rectf.Bottom - 2, rectf.Right, rectf.Y + rectf.Bottom - 2);

                        if (m_MergeTitles.Count > 0)
                        {
                            float y = 0, ly = 0;
                            for (int i = 1; i < m_MergeTitles.Count+1; i++)
                            {
                                y = rectf.Y + rectf.Height * i / m_MergeTitles.Count;
                                //X Center separator
                                e.Graphics.DrawLine(gridLinePen, rectf.X, y, rectf.Right,y);
                                //Y Center separator
                                if (i < m_MergeTitles.Count)
                                {
                                    float xW = rectf.Width / m_MergeTitles[i - 1].Titles.Count;
                                    float lx = rectf.X;
                                    for (int j = 1; j <= m_MergeTitles[i - 1].Titles.Count; j++)
                                    {
                                        float x = rectf.X + xW * j;
                                        SizeF fSize = e.Graphics.MeasureString(
                                      m_MergeTitles[i - 1].Titles[j - 1], e.CellStyle.Font);
                                        e.Graphics.DrawString(m_MergeTitles[i - 1].Titles[j - 1], e.CellStyle.Font,
                                          ForeColorBrush, lx + (x - lx - fSize.Width) / 2, ly + (y - ly - fSize.Height) / 2,
                                          StringFormat.GenericDefault);

                                        lx += x - lx;

                                        e.Graphics.DrawLine(gridLinePen, x, ly, x, y);

                                      
                                    }
                                }
                                else //last title
                                {
                                    float lx = rectf.X;
                                    for (int k = mergeTitle.StartCol,t=0; k <= mergeTitle.EndCol; k++,t++)
                                    {

                                        SizeF fSize = e.Graphics.MeasureString(
                                        m_MergeTitles[i - 1].Titles[t], e.CellStyle.Font);
                                        e.Graphics.DrawString(m_MergeTitles[i - 1].Titles[t], e.CellStyle.Font,
                                          ForeColorBrush, lx + (this.Columns[k].Width - fSize.Width) / 2, ly + (y - ly - fSize.Height) / 2, StringFormat.GenericDefault);
                                     
                                        lx += this.Columns[k].Width;
                                        e.Graphics.DrawLine(gridLinePen, lx, ly, lx, y);



                                    }
                                }
                                ly = y;
                            }


                    }

                }
            }
            e.Handled = true;
        }
    }
}


---------------------------------------------------------------------------------

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Collections;
using  System.ComponentModel;

namespace  JControl.WinForm
{
    public class MergeTitle
    {
        private int m_StartCol = -1;
        private int m_EndCol = -1;
        private List<string> m_Titles = new List<string>();
        [Browsable(true), Description("设置合并单元开始列")]
        public int StartCol
        {
            get { return m_StartCol; }
            set { m_StartCol = value; }
        }
        [Browsable(true), Description("设置合并单元结束列")]
        public int EndCol 
        {
            get { return m_EndCol; }
            set { m_EndCol = value; }
        }
        [Browsable(true), Description("设置合并单元标题")]
        [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Content)]
        public List<string> Titles
        {
            get { return m_Titles;}
            set { m_Titles = value; }
        }
        public void AddTitle(string Title)
        {
            m_Titles.Add(Title);
        }
        public void RemoveTitle(int Index)
        {
            m_Titles.RemoveAt(Index);
        }

    }
}