AspxGridView设置多表头，并利用HtmlTextWriter和MyXls两种方法分别导出数据到Excel

AspxGridView设置多表头

Code
protected void gvProject_HtmlRowCreated(object sender, DevExpress.Web.ASPxGridView.ASPxGridViewTableRowEventArgs e)
    {
        if (e.RowType == DevExpress.Web.ASPxGridView.GridViewRowType.Data && e.VisibleIndex == gvProject.PageIndex * gvProject.SettingsPager.PageSize)
        {
            Table tb = e.Row.Parent as Table;            
            
            TableRow tr = null;
            TableCell tc = null;

            tr = new TableRow();

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "序号";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "借款人";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc"; 
            tc.Text = "银团总额度";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "我行承担额度";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "我行角色";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "经办机构";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 1;
            tc.CssClass = "HeadTc";
            tc.Text = "意向";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 3;
            tc.CssClass = "HeadTc";
            tc.Text = "立项流程";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "尽职调查流程";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 3;
            tc.CssClass = "HeadTc";
            tc.Text = "分行授信";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "总行授信";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "组团流程";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.ColumnSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "合同文本审定";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "签约";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "首次提款";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "银团费收取";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "费率及金额";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "当前余额";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "进度描述";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "备注";
            tr.Cells.Add(tc);

            tc = new TableCell();
            tc.RowSpan = 2;
            tc.CssClass = "HeadTc";
            tc.Text = "主评估人";
            tr.Cells.Add(tc);

            tb.Rows.AddAt(0, tr);

            string[] sub ={ "接受委托", "支行上报", "报总行", "总行立项下发", "开始调查", "完成评估", "上报分行授信", "上会时间", "批复下发", "上报总行授信", "批复下发", "发出邀请函", "银团会议召开", "合同文本草拟完成", "合同文本审定完成" };
            tr = new TableRow();
            for (int i = 0; i < sub.Length; i++)
            {
                tc = new TableCell();
                tc.CssClass = "HeadSubTc";
                tc.Text = sub[i];
                tr.Cells.Add(tc);
            }

            tb.Rows.AddAt(1, tr);
            //tb.Rows.RemoveAt(0);
        }
    }

遗憾的是，AspxGridViewExporter不能将多表头导出到Excel，而常用的Response+HtmlTextWriter方法又会将AspxGridView的loading、pager等图片导出。可利用HtmlTextWriter的另一方法导出数据到Excel，不过这个Excel文件不是真正的Excel格式。  

Code
protected void ASPxButton2_Click(object sender, EventArgs e)
    {
        Response.Clear();
        Response.ContentType = "application/vnd.ms-excel";
        string excelname = "报表";
        //Response.AddHeader("content-disposition", "inline; filename=" + System.Web.HttpUtility.UrlEncode(excelname, System.Text.Encoding.UTF8) + ".xls");  //直接在浏览器中打开
        Response.AddHeader("content-disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(excelname, System.Text.Encoding.UTF8) + ".xls");
        this.EnableViewState = false;
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter writer = new System.Web.UI.HtmlTextWriter(oStringWriter);        

        System.Text.StringBuilder builder = new System.Text.StringBuilder();

        builder.Append("<table border='1'>");
        builder.Append("<tr align='center' bgcolor='#BDCB85'>");
        builder.Append("<td rowspan='2'>序号</td>");
        builder.Append("<td rowspan='2'>借款人</td>");
        builder.Append("<td rowspan='2'>银团总额度</td>");
        builder.Append("<td rowspan='2'>我行承担额度</td>");
        builder.Append("<td rowspan='2'>我行角色</td>");
        builder.Append("<td rowspan='2'>经办机构</td>");
        builder.Append("<td colspan='1'>意向</td>");
        builder.Append("<td colspan='3'>立项流程</td>");
        builder.Append("<td colspan='2'>尽职调查流程</td>");
        builder.Append("<td colspan='3'>分行授信</td>");
        builder.Append("<td colspan='2'>总行授信</td>");
        builder.Append("<td colspan='2'>组团流程</td>");
        builder.Append("<td colspan='2'>合同文本审定</td>");
        builder.Append("<td rowspan='2'>签约</td>");
        builder.Append("<td rowspan='2'>首次提款</td>");
        builder.Append("<td rowspan='2'>银团费收取</td>");
        builder.Append("<td rowspan='2'>费率及金额</td>");
        builder.Append("<td rowspan='2'>当前余额</td>");
        builder.Append("<td rowspan='2'>进度描述</td>");
        builder.Append("<td rowspan='2'>备注</td>");
        builder.Append("<td rowspan='2'>主评估人</td>");
        builder.Append("</tr>");
        builder.Append("<tr align='center' bgcolor='#BDB76B'>");
        builder.Append("<td>接受委托</td>");
        builder.Append("<td>支行上报</td>");
        builder.Append("<td>报总行</td>");
        builder.Append("<td>总行立项下发</td>");
        builder.Append("<td>开始调查</td>");
        builder.Append("<td>完成评估</td>");
        builder.Append("<td>上报分行授信</td>");
        builder.Append("<td>上会时间</td>");
        builder.Append("<td>批复下发</td>");
        builder.Append("<td>上报总行授信</td>");
        builder.Append("<td>批复下发</td>");
        builder.Append("<td>发出邀请函</td>");
        builder.Append("<td>银团会议召开</td>");
        builder.Append("<td>合同文本草拟完成</td>");
        builder.Append("<td>合同文本审定完成</td>");
        builder.Append("</tr>");

        DataView dv = (DataView)AccessDataSource1.Select(DataSourceSelectArguments.Empty);
        if (dv != null)
        {
            int i, j;
            int rows = dv.Count;
            int cols = gvProject.Columns.Count;
            for (i = 0; i < rows; i++)
            {
                builder.Append("<tr>");
                builder.Append("<td>");
                builder.Append((i + 1).ToString() + "</td>");
                for (j = 1; j < cols; j++)
                {
                    if (dv[i][j] is System.DateTime)
                        builder.Append("<td style='vnd.ms-excel.numberformat:yyyy/MM/dd'>");
                    else
                        builder.Append("<td style='vnd.ms-excel.numberformat:#,###'>");
                    builder.Append(dv[i][j].ToString());
                    builder.Append("</td>");
                }
                builder.Append("</tr>");
            }
        }

        builder.Append("</table>");

        writer.Write(builder.ToString());
        writer.Close();

        Response.Write(oStringWriter.ToString());
        Response.End();
    }

 

其中Css样式文件部分内容如下：

Code
.HeadTc
{
    font-weight:bold;
    text-align:center;
    vertical-align:middle;
    white-space:nowrap;
    padding-left:2px;
    padding-right:2px;
    border-bottom:#A4B26D 1px solid;
    border-right:#A4B26D 1px solid;
    background-color:#BDCB85;
}

.HeadSubTc
{
    font-weight:bold;
    color:Green;
    text-align:center;
    vertical-align:middle;
    white-space:nowrap;
    padding-left:2px;
    padding-right:2px;
    border-bottom:#A4B26D 1px solid;
    border-right:#A4B26D 1px solid;
    background-color:#BDB76B;
}

 

但是，从代码上看，利用HtmlTextWriter导出的Excel并不是真正的Excel格式文件，而且上述方法设置的Excel单元格背景色无效。我们可以采用MyXls来完善导出操作。

Code
protected void ASPxButton1_Click(object sender, EventArgs e)
    {
        XlsDocument xls = new XlsDocument();
        xls.FileName = "Wacky.xls";

        Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");
        Cells cells = sheet.Cells;

        ColumnInfo ci = null;

        ci = new ColumnInfo(xls, sheet);
        ci.ColumnIndexStart = 0;
        ci.ColumnIndexEnd = 0;
        ci.Width = 5 * 256;
        sheet.AddColumnInfo(ci);

        ci = new ColumnInfo(xls, sheet);
        ci.ColumnIndexStart = 1;
        ci.ColumnIndexEnd = 1;
        ci.Width = 35*256;
        sheet.AddColumnInfo(ci);

        ushort index;
        for (index = 2; index <= 25;index++ )
        {
            ci = new ColumnInfo(xls, sheet);
            ci.ColumnIndexStart = index;
            ci.ColumnIndexEnd = index;
            ci.Width = 10 * 256;
            sheet.AddColumnInfo(ci);
        }

        ci = new ColumnInfo(xls, sheet);
        ci.ColumnIndexStart = 26;
        ci.ColumnIndexEnd = 26;
        ci.Width = 15 * 256;
        sheet.AddColumnInfo(ci);

        ci = new ColumnInfo(xls, sheet);
        ci.ColumnIndexStart = 27;
        ci.ColumnIndexEnd = 27;
        ci.Width = 35 * 256;
        sheet.AddColumnInfo(ci);

        ci = new ColumnInfo(xls, sheet);
        ci.ColumnIndexStart = 28;
        ci.ColumnIndexEnd = 28;
        ci.Width = 30 * 256;
        sheet.AddColumnInfo(ci);

        MergeArea ma;
        XF xfCell = null;
        int i;

        string[] BasicInfo ={ "序号", "借款人", "银团总额度", "我行承担额度", "我行角色", "经办机构" };
        for (i = 1; i <= BasicInfo.Length; i++)
        {            
            xfCell = xls.NewXF();
            xfCell.HorizontalAlignment = HorizontalAlignments.Centered;
            xfCell.VerticalAlignment = VerticalAlignments.Centered;
            xfCell.Pattern = 1;
            //xfCell.PatternBackgroundColor = Colors.Default16;
            xfCell.PatternColor = Colors.Default16;
            xfCell.LeftLineStyle = 1;
            xfCell.LeftLineColor = Colors.Black;
            xfCell.TopLineStyle = 1;
            xfCell.TopLineColor = Colors.Black;
            xfCell.BottomLineStyle = 1;
            xfCell.BottomLineColor = Colors.Black;
            xfCell.RightLineStyle = 1;
            xfCell.RightLineColor = Colors.Black;
            xfCell.TextWrapRight = true;
            xfCell.Font.Bold = true;
            cells.Add(1, i, BasicInfo[i - 1], xfCell);
            cells.Add(2, i, "", xfCell);

            ma = new MergeArea(1, 2, i, i);
            sheet.AddMergeArea(ma);
        }

        string[] HostNode ={ "意向", "立项流程", "尽职调查流程", "分行授信", "总行授信", "组团流程", "合同文本审定" };
        int[] SubNodeNum ={ 1, 3, 2, 3, 2, 2, 2 };
        int SubNodeStartCol = i;
        int j, startCol, endCol;
        for (j = 1; j <= HostNode.Length; j++)
        {
            startCol = i;
            endCol = startCol + SubNodeNum[j - 1] - 1;            

            xfCell = xls.NewXF();
            xfCell.HorizontalAlignment = HorizontalAlignments.Centered;
            xfCell.VerticalAlignment = VerticalAlignments.Centered;
            xfCell.Pattern = 1;
            xfCell.PatternColor = Colors.Default16;
            xfCell.LeftLineStyle = 1;
            xfCell.LeftLineColor = Colors.Black;
            xfCell.TopLineStyle = 1;
            xfCell.TopLineColor = Colors.Black;
            xfCell.BottomLineStyle = 1;
            xfCell.BottomLineColor = Colors.Black;
            xfCell.RightLineStyle = 1;
            xfCell.RightLineColor = Colors.Black;
            xfCell.TextWrapRight = true;
            xfCell.Font.Bold = true;

            for (int id = startCol; id <= endCol;id++ )
                cells.Add(1, id, "", xfCell);

            ma = new MergeArea(1, 1, startCol, endCol);
            sheet.AddMergeArea(ma);
            
            cells.Add(1, startCol, HostNode[j - 1]);

            i = endCol + 1;
        }

        string[] others ={ "签约", "首次提款", "银团费收取", "费率及金额", "当前余额", "进度描述", "备注", "主评估人" };
        int k;
        for (k = 0; k < others.Length; k++)
        {            
            xfCell = xls.NewXF();
            xfCell.HorizontalAlignment = HorizontalAlignments.Centered;
            xfCell.VerticalAlignment = VerticalAlignments.Centered;
            xfCell.Pattern = 1;
            xfCell.PatternColor = Colors.Default16;
            xfCell.LeftLineStyle = 1;
            xfCell.LeftLineColor = Colors.Black;
            xfCell.TopLineStyle = 1;
            xfCell.TopLineColor = Colors.Black;
            xfCell.BottomLineStyle = 1;
            xfCell.BottomLineColor = Colors.Black;
            xfCell.RightLineStyle = 1;
            xfCell.RightLineColor = Colors.Black;
            xfCell.TextWrapRight = true;
            xfCell.Font.Bold = true;
            cells.Add(1, k + i, others[k], xfCell);
            cells.Add(2, k + i, "", xfCell);

            ma = new MergeArea(1, 2, k + i, k + i);
            sheet.AddMergeArea(ma);
        }

        string[] SubNode ={ "接受委托", "支行上报", "报总行", "总行立项下发", "开始调查", "完成评估", "上报分行授信", "上会时间", "批复下发", "上报总行授信", "批复下发", "发出邀请函", "银团会议召开", "合同文本草拟完成", "合同文本审定完成" };
        Cell myCell = null;
        for (k = 0; k < SubNode.Length; k++)
        {
            myCell = cells.Add(2, k + SubNodeStartCol, SubNode[k]);
            myCell.HorizontalAlignment = HorizontalAlignments.Centered;
            myCell.VerticalAlignment = VerticalAlignments.Centered;
            myCell.Pattern = 1;
            myCell.PatternColor = Colors.Default37;
            myCell.LeftLineStyle = 1;
            myCell.LeftLineColor = Colors.Black;
            myCell.TopLineStyle = 1;
            myCell.TopLineColor = Colors.Black;
            myCell.BottomLineStyle = 1;
            myCell.BottomLineColor = Colors.Black;
            myCell.RightLineStyle = 1;
            myCell.RightLineColor = Colors.Black;
            myCell.TextWrapRight = true;
            myCell.Font.Bold = true;
        }

        DataView dv = (DataView)AccessDataSource1.Select(DataSourceSelectArguments.Empty);
        if (dv != null)
        {
            int rows = dv.Count;
            int cols = gvProject.Columns.Count;
            for (i = 0; i < rows; i++)
            {
                for (j = 0; j < cols; j++)
                {
                    if (j == 0)
                        myCell = cells.Add(3 + i, 1, i + 1);
                    else
                    {
                        if (dv[i][j] is System.DateTime)
                            myCell = cells.Add(3 + i, j + 1, String.Format("{0:d}", dv[i][j]));
                        else if (dv[i][j] is System.Int32)
                        {
                            myCell = cells.Add(3 + i, j + 1, dv[i][j]);
                            myCell.Format = StandardFormats.Decimal_3;     //数字带千分位：#,##0
                        }
                        else
                            myCell = cells.Add(3 + i, j + 1, dv[i][j].ToString());
                    }

                    myCell.LeftLineStyle = 1;
                    myCell.LeftLineColor = Colors.Black;
                    myCell.TopLineStyle = 1;
                    myCell.TopLineColor = Colors.Black;
                    myCell.BottomLineStyle = 1;
                    myCell.BottomLineColor = Colors.Black;
                    myCell.RightLineStyle = 1;
                    myCell.RightLineColor = Colors.Black;
                    myCell.TextWrapRight = true;
                    myCell.VerticalAlignment = VerticalAlignments.Centered;
                }
            }
        }

        xls.Send();
        Response.Flush();
        Response.End();
    }