C#GridView控件导出Excel及多层表头类

说明：此类是集合了网上朋友的一些类方法拼写而成，发表出来一便朋友们借鉴

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;

/*/时间：2010年2月6日
//文件：ExcelEdit.cs
//功能：定制griedview控件的表头，并能够导出Excel
//作者：门剑勇
//声明：此类是集合了网上的一些资料，并注明出处。加入了部分自己写的东东*/

/// <summary>
/// ExcelEdit 的摘要说明
/// 注意事项一：在调用此类的页添加下列方法
/// public override void VerifyRenderingInServerForm(System.Web.UI.Control control)
/// {
/// //什么都没有，空的函数
/// }
///
/// 注意事项二：
/// SplitTableHeader函数是用在GridView控件的RowCreated事件中，调用方法如下例子：
/// protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
/// {
/// if (e.Row.RowType == DataControlRowType.Header)
/// {
/// ExcelEdit dHelper = new ExcelEdit();
/// 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);
/// }
/// }
///
/// 注意事项三：
/// ModifygrdHeader函数，详细看函数说明。
/// </summary>
public class ExcelEdit
{
/// <summary>
/// ExcelEdit类构造函数
/// </summary>
public ExcelEdit()
{
}

/// <summary>
/// 定义dataset属性
/// </summary>
private DataSet _DS;
public DataSet DS
{
set { _DS = value; }
get { return _DS; }
}

/// <summary>
/// 定义GridView属性
/// </summary>
private GridView _GV;
public GridView GV
{
set { _GV = value;}
get { return _GV; }
}

/// <summary>
/// 绑定数据源，成功返回true，失败返回false。
/// </summary>
private bool BindGridView()
{
try
{
//定义GirdView的格式后，绑定数据源。
_GV.AllowPaging = false;
_GV.DataSource = _DS;
_GV.DataBind();
}
catch (Exception e)
{
//错误跳转到指定的错误页面
return false;
string url = HttpContext.Current.Request.ApplicationPath + "/error.aspx?error=" + e.Message.ToString() + "&strurl=" + HttpContext.Current.Request.Url.ToString();
HttpContext.Current.Response.Redirect(url);
}
//函数成功
return true;
}

/// <summary>
/// 导出GridView控件中的数据Excel
/// </summary>
public void toExcelgrdExcel()
{
if (BindGridView())
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.Charset = "GB2312";
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=Qty.xls");
//如果设置为 GetEncoding("GB2312");导出的文件将会出现乱码！！！
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
//设置输出文件类型为excel文件。
HttpContext.Current.Response.ContentType = "application/ms-excel";
//定义文件流，和控件输出流，建立关联。
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.Html32TextWriter oHtmlTextWriter = new Html32TextWriter(oStringWriter);
//将控件的信息写到输出流。
_GV.RenderControl(oHtmlTextWriter);
HttpContext.Current.Response.Output.Write(oStringWriter.ToString());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
}

/// <summary>
/// 在绑定后导出时可以改变_GV表头
/// </summary>
public void ModifygrdHeader()
{
try
{
_GV.HeaderRow.Cells.Clear();
TableCell cell = new TableCell();
cell.Text = "<tr style='background-color: #006699;font-size: 15px;color: #FFFFFF;padding: 2pt;'><td rowspan='2' style='font-size=15px'>Customer</td><td rowspan=2 style='font-size=15px'>" +
"Size</td><td rowspan='2' style='font-size=15px'>TAC Film</td><td rowspan='2' style='font-size=15px'>搭配性产品</td><td rowspan='2' style='font-size=15px'>T/B</td><td rowspan='2' style='font-size=15px'>Absorption Angle</td>" +
"<td rowspan='2' style='font-size=15px'>Dimension_X</td><td rowspan='2' style='font-size=15px'>Dimension_Y</td><td rowspan='2' style='font-size=15px'>经济幅宽</td><td colspan='2' style='font-size=15px'>1330mm</td><td colspan='2' style='font-size=15px'>1475mm</td><td colspan='2' style='font-size=15px'>2000mm</td>" +
"</tr><tr style='background-color: #006699;font-size: 12px;color: #FFFFFF;padding: 2pt;'><td>片数/M</td><td>利用率</td><td>片数/M</td><td>利用率</td><td>片数/M</td><td>利用率</td>";

_GV.HeaderRow.Cells.Add(cell);
}
catch (Exception e)
{
string url = HttpContext.Current.Request.ApplicationPath + "/error.aspx?error=" + e.Message.ToString() + "&strurl=" + HttpContext.Current.Request.Url.ToString();
HttpContext.Current.Response.Redirect(url);
}
}

#region
// 用于生成Excel表头的函数块
// 时间: 23:07 2008/9/28 Author: Andy Lu
// 文件: AndyGridViewTHeaderHepler.cs
// 功能: 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(',').
// 两行：序号#分公司#组别#本日成功签约单数 预警,续约,流失,合计#累计成功签约单数 预警,续约,流失,合计#任务数#完成比例#排名
// 三行：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
// 三行时请注意：列头要重复
// 文件出处：/article/6240961.html
public void SplitTableHeader(GridViewRow targetHeader, string newHeaderNames)
{
//获得表头元素的实例
TableCellCollection tcl = targetHeader.Cells;
//清除元素
tcl.Clear();
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);
//添加表头控件
tcl.Add(new TableHeaderCell());
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)
{
//添加表头控件
tcl.Add(new TableHeaderCell());
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 class=" + targetHeader.CssClass + ">";
}
}
}

/// <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;
}
#endregion
}