前几天，从 fengzhimei 那里看到一篇在 asp.net将 datagrid中的数据导到excel中的文章 ，今天有空试了试，发现在导出有排序功能的表格的出现问题（设置模板列也会存在问题）：在运行加载页面时，提示 datagrid中的某些列 必须放在 runat=server 的form中。
csdn中有人问这样的问题，好像都没有解决，查了一些资料，发现这是由于datagrid中的控件引起的，需要在运行的时候删除这些控件。 在 http://www.c-sharpcorner.com/Code/2003/Sept/ExportASPNetDataGridToExcel.asp 里有详细的说明，我贴出源代码：
WebForm1.aspx:
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="Webtest.WebForm1" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>WebForm1</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <FONT face="宋体"> <asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 152px; POSITION: absolute; TOP: 80px" runat="server" Text="Button" Width="168px" Height="56px"></asp:Button> <asp:DataGrid id="DataGrid1" style="Z-INDEX: 102; LEFT: 56px; POSITION: absolute; TOP: 160px" runat="server" Width="363px" Height="195px"></asp:DataGrid></FONT> </form> </body></HTML>WebForm1.aspx.cs
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Data.SqlClient;namespace Webtest
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary> public class WebForm1 : System.Web.UI.Page { protected System.Web.UI.WebControls.DataGrid DataGrid1; protected System.Web.UI.WebControls.Button Button1; private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 if (!IsPostBack) { SqlConnection conn = new SqlConnection ("data source=(local);initial catalog=Northwind;Pwd=;User ID=sa"); SqlCommand cmd = new SqlCommand ("Select LastName, FirstName, Title, TitleOfCourtesy, BirthDate, HireDate, Address, City, Region, PostalCode, Country from Employees", conn); SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); DataGrid1.DataSource = ds.Tables[0]; DataGrid1.DataBind(); } }
Web 窗体设计器生成的代码 private void Button1_Click(object sender, System.EventArgs e) {// Response.Write("<script language='javascript'>window.open('WebForm3.aspx')</script>"); Response.Clear(); Response.Buffer= true; Response.ContentType = "application/vnd.ms-excel"; Response.Charset = ""; this.EnableViewState = false; System.IO.StringWriter oStringWriter = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter); this.ClearControls(DataGrid1); DataGrid1.RenderControl(oHtmlTextWriter); Response.Write(oStringWriter.ToString()); Response.End(); } private void ClearControls(Control control) { for (int i=control.Controls.Count -1; i>=0; i--) { ClearControls(control.Controls[i]); } if (!(control is TableCell)) { if (control.GetType().GetProperty("SelectedItem") != null) { LiteralControl literal = new LiteralControl(); control.Parent.Controls.Add(literal); try { literal.Text = (string)control.GetType().GetProperty("SelectedItem").GetValue(control,null); } catch { } control.Parent.Controls.Remove(control); } else if (control.GetType().GetProperty("Text") != null) { LiteralControl literal = new LiteralControl(); control.Parent.Controls.Add(literal); literal.Text = (string)control.GetType().GetProperty("Text").GetValue(control,null); control.Parent.Controls.Remove(control); } } return; } }
}