GridView复合多层表头(不限级)!!!

头定义说明：
        表头定义方法:相邻父列头之间用'#'分隔,上级行与下级行用空格(' ')分隔,相邻未级子列头用逗号分隔(',').
表头定义示例：
A.两层

烟叶等级#级别#保山市 保山,小计#楚雄州 姚安,小计#大理州 宾川,大理,小计#红河州 建水,泸西,弥勒,石屏,小计#昆明市 富民,禄劝,小计#丽江市 华坪,宁蒗,小计#临沧市 沧源,凤庆,耿马,临翔,双江,永德,云县,镇康,小计#普洱市 景东,思茅,镇沅,小计#曲靖市 富源,陆良,罗平,师宗,宣威,小计#文山州 文山,小计#玉溪市 玉溪,小计#总计
B.三层

等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,比例#本期发出 产品外销百分比 件数,重量,比例#平均值

调用说明:使用时在GridView的RowCreated事件中加入下面代码调用

        if (e.Row.RowType == DataControlRowType.Header)
        ...{
            DynamicTHeaderHepler dHelper = new DynamicTHeaderHepler();
            string header = "等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,"
                          + "比例#本期发出 产品外销百分比 件数,重量,比例#平均值";

            dHelper.SplitTableHeader(e.Row, header);
        }
表头生成类：

//
//***********************************************************************
//  Created: 2007-10-29    Author:  ruijc
//  File: DynamicTHeaderHepler.cs
//  Description: 动态生成复合表头帮助类
//  相邻父列头之间用'#'分隔,父列头与子列头用空格(' ')分隔,相邻子列头用逗号分隔(',').
//***********************************************************************
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;
using System.Collections;
public class DynamicTHeaderHepler
...{
    public DynamicTHeaderHepler()
    ...{
        //
        // TODO: Add constructor logic here
        //
    }

    /**//// <summary>
    /// 重写表头
    /// </summary>
    /// <param name="targetHeader">目标表头</param>
    /// <param name="newHeaderNames">新表头</param>
    /// <remarks>
    /// 等级#级别#上期结存 件数,重量,比例#本期调入 收购调入 件数,重量,比例#本期发出 车间投料 件数,重量,
    /// 比例#本期发出 产品外销百分比 件数,重量,比例#平均值
    /// </remarks>
    public void SplitTableHeader(GridViewRow targetHeader, string newHeaderNames)...{
        TableCellCollection tcl = targetHeader.Cells;//获得表头元素的实例
        tcl.Clear();//清除元素
        int row = GetRowCount(newHeaderNames);
        int col = GetColCount(newHeaderNames);
        string[,] nameList = ConvertList(newHeaderNames,row,col);
        int RowSpan = 0;
        int ColSpan = 0;
        for (int k = 0; k < row; k++)
        ...{
            string LastFName = "";
            for (int i = 0; i < col; i++)
            ...{
                if (LastFName == nameList[i, k] && k!=row-1)
                ...{
                    LastFName = nameList[i, k];
                    continue;
                }
                else
                ...{
                    LastFName = nameList[i, k];
                }
                int bFlag=IsVisible(nameList, k, i, LastFName);
                switch (bFlag)
                ...{
                    case 0:
                        break;
                    case 1:
                        RowSpan = GetSpanRowCount(nameList,row, k, i);
                        ColSpan = GetSpanColCount(nameList,row,col, k, i);
                        tcl.Add(new TableHeaderCell());//添加表头控件
                        tcl[tcl.Count - 1].RowSpan = RowSpan;
                        tcl[tcl.Count - 1].ColumnSpan = ColSpan;
                        tcl[tcl.Count - 1].HorizontalAlign = HorizontalAlign.Center;
                        tcl[tcl.Count - 1].Text = LastFName;
                        break;
                    case -1:
                        string[] EndColName = LastFName.Split(new char[] ...{ ',' });
                        foreach(string eName in EndColName)...{
                            tcl.Add(new TableHeaderCell());//添加表头控件
                            tcl[tcl.Count - 1].HorizontalAlign = HorizontalAlign.Center;
                            tcl[tcl.Count - 1].Text = eName;
                        }
                        break;
                }
            }
            if (k != row-1)
            ...{//不是起始行,加入新行标签
                tcl[tcl.Count - 1].Text = tcl[tcl.Count - 1].Text+"</th></tr><tr>";
            }
        }
    }

    /**//// <summary>
    /// 如果上一行已经输出和当前内容相同的列头，则不显示
    /// </summary>
    /// <param name="ColumnList">表头集合</param>
    /// <param name="rowIndex">行索引</param>
    /// <param name="colIndex">列索引</param>
    /// <returns>1:显示,-1:含','分隔符,0:不显示</returns>
    private int IsVisible(string[,] ColumnList,int rowIndex, int colIndex,string CurrName)
    ...{
        if (rowIndex!=0)...{
            if (ColumnList[colIndex,rowIndex-1]==CurrName)...{
                return 0;
            }else...{
                if (ColumnList[colIndex, rowIndex].Contains(","))
                ...{
                    return -1;
                }else...{
                    return 1;
                }
            }
        }
        return 1;
    }

    /**//// <summary>
    /// 取得和当前索引行及列对应的下级的内容所跨的行数
    /// </summary>
    /// <param name="ColumnList">表头集合</param>
    /// <param name="row">行数</param>
    /// <param name="rowIndex">行索引</param>
    /// <param name="colIndex">列索引</param>
    /// <returns>行数</returns>
    private int GetSpanRowCount(string[,] ColumnList, int row,int rowIndex, int colIndex)
    ...{
        string LastName = "";
        int RowSpan = 1;
        for (int k = rowIndex; k < row; k++)
        ...{
            if (ColumnList[colIndex,k]==LastName)...{
                RowSpan++;
            }else...{
                LastName = ColumnList[colIndex, k];
            }
        }
        return RowSpan;
    }

    /**//// <summary>
    /// 取得和当前索引行及列对应的下级的内容所跨的列数
    /// </summary>
    /// <param name="ColumnList">表头集合</param>
    /// <param name="row">行数</param>
    /// <param name="col">列数</param>
    /// <param name="rowIndex">行索引</param>
    /// <param name="colIndex">列索引</param>
    /// <returns>列数</returns>
    private int GetSpanColCount(string[,] ColumnList,int row, int col,int rowIndex, int colIndex)...{
        string LastName = ColumnList[colIndex, rowIndex] ;
        int ColSpan = ColumnList[colIndex, row-1].Split(new char[] ...{ ',' }).Length;
        ColSpan = ColSpan == 1 ? 0 : ColSpan;
        for(int i=colIndex+1;i<col;i++)...{
            if (ColumnList[i, rowIndex] == LastName)
            ...{
                ColSpan += ColumnList[i, row - 1].Split(new char[] ...{ ',' }).Length;
            }
            else
            ...{
                LastName = ColumnList[i, rowIndex];
                break;
            }
        }
        return ColSpan;
    }

    /**//// <summary>
    /// 将已定义的表头保存到数组
    /// </summary>
    /// <param name="newHeaders">新表头</param>
    /// <param name="row">行数</param>
    /// <param name="col">列数</param>
    /// <returns>表头数组</returns>
    private string[,] ConvertList(string newHeaders, int row, int col)
    ...{
        string[] ColumnNames = newHeaders.Split(new char[] ...{ '#' });
        string[,] news = new string[col, row];
        string Name = "";
        for (int i = 0; i < col; i++)
        ...{
            string[] CurrColNames = ColumnNames[i].ToString().Split(new char[] ...{ ' ' });
            for (int k = 0; k < row; k++)
            ...{
                if (CurrColNames.Length - 1 >= k)
                ...{
                    if (CurrColNames[k].Contains(","))
                    ...{
                        if (CurrColNames.Length != row)
                        ...{
                            if (Name == "")
                            ...{
                                news[i, k] = news[i, k - 1];
                                Name = CurrColNames[k].ToString();
                            }
                            else
                            ...{
                                news[i, k + 1] = Name;
                                Name = "";
                            }
                        }else...{
                            news[i, k] = CurrColNames[k].ToString();
                        }
                    }else...{
                        news[i, k] = CurrColNames[k].ToString();
                    }
                }else...{
                    if (Name == "")
                    ...{
                        news[i, k] = news[i, k - 1];
                    }else...{

                        news[i, k] = Name;
                        Name = "";
                    }
                }
            }
        }
        return news;
    }

    /**//// <summary>
    /// 取得复合表头的行数
    /// </summary>
    /// <param name="newHeaders">新表头</param>
    /// <returns>行数</returns>
    private int GetRowCount(string newHeaders)
    ...{
        string[] ColumnNames = newHeaders.Split(new char[] ...{ '#' });
        int Count = 0;
        foreach(string name in ColumnNames)...{
            int TempCount = name.Split(new char[] ...{ ' ' }).Length;
            if (TempCount > Count)
                Count = TempCount;
        }
        return Count;
    }

    /**//// <summary>
    /// 取得复合表头的列数
    /// </summary>
    /// <param name="newHeaders">新表头</param>
    /// <returns>列数</returns>
    private int GetColCount(string newHeaders)...{
        return newHeaders.Split(new char[] ...{ '#' }).Length;
    }
  
}

http://blog.csdn.net/aoeagle/archive/2008/02/20/2108567.aspx