asp.net导出excle

思路：实际上是读取页面上某个控件下的内容再导出

  protected void btnExcel_Click(object sender, EventArgs e)
    {
        string bgType = "";
        string fileName = "预算汇总申请查询";

        ContTaskList1.Visible = false;
        ContApproveOpinion1.Visible = false;
        trCondition.Visible = false;
        btnQuery.Visible = false;
        btnExcel.Visible = false;
        UcAssetBgSum1.isSHOW = false;
        trE.Visible = true;        

        switch (dpQuarter.SelectedValue.Trim())
        {
            case "":
                bgType = "年度预算";
                break;
            case "":
                bgType = "一季度预算";
                break;
            case "":
                bgType = "二季度预算";
                break;
            case "":
                bgType = "三季度预算";
                break;
            case "":
                bgType = "四季度预算";
                break;
        }
        this.lblYear.Text = dpYear.SelectedValue.Trim() + "年";
        this.lblQuarter.Text = bgType;

        using (DataReimbursementDataContext db = new DataReimbursementDataContext())
        {
            int intYear = int.Parse(this.dpYear.SelectedValue.Trim());
            int intQuarter = int.Parse(this.dpQuarter.SelectedValue.Trim());
            OA_TAB_FA_DOCSUM doc = db.OA_TAB_FA_DOCSUM.SingleOrDefault(p => p.DOC_YEAR == intYear && p.DOC_QUARTER == intQuarter);
            if (doc == null)
            {
                TextHelper.ShowMessage(tdMsg, "没有记录！", false);
            }
            else
            {
                TextHelper.ShowMessage(tdMsg, "", false);

                this.UcAssetBgSum1.Visible = true;
                this.UcAssetBgSum1.DocNo = doc.DOC_ID.Trim();
                this.UcAssetBgSum1.BindData();
            }

        }

        StringBuilder sb = new StringBuilder();
        StringWriter sw = new StringWriter(sb);
        HtmlTextWriter htw = new HtmlTextWriter(sw);

        Page page = new Page();
        HtmlForm form = new HtmlForm();

        TABLE2.EnableViewState = false;

        page.EnableEventValidation = false;

        page.DesignerInitialize();

        page.Controls.Add(form);
        form.Controls.Add(TABLE2);

        page.RenderControl(htw);

        Response.Clear();
        Response.Buffer = true;
        Response.ContentType = "application/vnd.ms-excel";
        Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpContext.Current.Server.UrlEncode(fileName) + ".xls");
        Response.Charset = "UTF-8";
        Response.ContentEncoding = Encoding.Default;
        Response.Write(sb.ToString());
        Response.End();

    }

<table id="TABLE3" width="100%" cellspacing="0" border="0" cellpadding="0" runat="server">
        <tr>
            <td colspan="2" valign="top">
                <table width="100%" cellspacing="0" cellpadding="0" runat="server">
                    <tr>
                        <td height="20" >
                            <table width="100%" cellspacing="0" cellpadding="0" runat="server">
                                <tr>
                                    <td width="30" bgcolor="#F2F9FD" class="p9">
                                        <div align="center">
                                            <img src="../images/bon_8.png" width="18" height="18"></div>
                                    </td>
                                    <td height="30" bgcolor="#F2F9FD" class="p9">
                                        您当前的位置：固定资产 > 预算汇总申请查询</td>
                                    <td class="p9" bgcolor="#F2F9FD" align="right" width="200" >登录用户：
                                            <uc1:UcUserInfo ID="UcUserInfo1" runat="server" />
                                    </td>
                                </tr>
                            </table>
                        </td>
                    </tr>
                    <tr>
                        <td height="14" background="../images/right_jian.jpg">
                        </td>
                    </tr>
                </table>
            </td>
        </tr>
        <tr>
            <td width="3%">
                 
            </td>
            <td>
           <table border="0" cellpadding="1" cellspacing="1" class="Table1" id="TABLE2" width="100%" runat="server">
                <tr id="trCondition" runat="server">
                    <td class="tdleft">年度：</td>
                    <td>
                        <asp:DropDownList ID="dpYear" runat="server">
                        </asp:DropDownList>
                    </td>
                   <td class="tdleft">预算类型：</td>
                    <td>
                        <asp:DropDownList ID="dpQuarter" runat="server">
                            <asp:ListItem Value="0">年度预算</asp:ListItem>
                            <asp:ListItem Value="1">一季度预算</asp:ListItem>
                            <asp:ListItem Value="2">二季度预算</asp:ListItem>
                            <asp:ListItem Value="3">三季度预算</asp:ListItem>
                            <asp:ListItem Value="4">四季度预算</asp:ListItem>
                        </asp:DropDownList>
                    </td>
                    <td>
                        <asp:Button ID="btnQuery" runat="server" Text="查  询" onclick="btnQuery_Click" />
                            
                        <asp:Button ID="btnExcel" runat="server" Text="导出excel"
                            onclick="btnExcel_Click" />
                    </td>
                </tr>
                <tr>
                    <td id="tdMsg" runat="server" colspan=5> </td>
                </tr>

                <tr id="trE" runat="server" visible="false">
                    <td colspan="5">
                        年度：<asp:Label ID="lblYear" runat="server" Text=""></asp:Label>
                             
                        预算类型：<asp:Label ID="lblQuarter" runat="server" Text=""></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td colspan=5>

                        <uc2:UcAssetBgSum ID="UcAssetBgSum1" runat="server" />
                        <uc3:ContTaskList ID="ContTaskList1" Visible=false runat="server" />
                        <uc4:ContApproveOpinion ID="ContApproveOpinion1" Visible=false runat="server"  />
                    </td>
                </tr>
                </table>
            </td>
        </tr>
    </table>

先存个档吧，省的以后还要导出找。