将数据库数据读出到DataGrid然后保存到excel中


答案：  我先给出部份程序的解释，然后给出整个源代码。
   DataSet objDataset = new DataSet();
   objConn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionSqlServer"].ToString());
   objConn.Open();//在web.config中的配置文件。
   SqlDataAdapter objAdapter = new SqlDataAdapter("Select top 10 * from customers where   country='USA'",objConn);//这里要改成你的数据库相应的表的选择句语
   objAdapter.Fill(objDataset); 
   DataView oView = new DataView(objDataset.Tables[0]);
   dgExcel.DataSource = oView;
   dgExcel.DataBind();
   objConn.Close();
   objConn.Dispose();
   objConn = null;
上面部分是从数据库中读出数据显示到DataGrid中去。
    Response.ContentType = "application/vnd.ms-excel";    
    Response.Charset = "";
   //关闭 ViewState
    EnableViewState = false;
    System.IO.StringWriter tw = new System.IO.StringWriter();//将信息写入字符串
    System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);//在WEB窗体页上写出一系列连续的HTML特定字符和文本。
    //此类提供ASP.NET服务器控件在将HTML内容呈现给客户端时所使用的格式化功能
//参见http://msdn.microsoft.com/library/chs/default.asp?url=/library/CHS/cpref/html/frlrfsystemwebuihtmltextwriterclasstopic.asp
    //获取control的HTML
    dgExcel.RenderControl(hw);//将DATAGRID中的内容输出到HtmlTextWriter对象中
    // 把HTML写回浏览器
    Response.Write(tw.ToString());
    Response.End();
全部代码如下：
 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;
using System.Configuration;
namespace CommonFunction
{
 /// <summary>
 /// excel 的摘要说明。
 /// </summary>
 public class excel : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.Button btnGetExcel;
  protected System.Web.UI.WebControls.DataGrid dgExcel;
  protected System.Data.SqlClient.SqlConnection objConn;
 
  private void Page_Load(object sender, System.EventArgs e)
  {
if(!IsPostBack)
{
   DataSet objDataset = new DataSet();
   objConn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionSqlServer"].ToString());
   objConn.Open();
   SqlDataAdapter objAdapter = new SqlDataAdapter("Select top 10 * from customers where country='USA'",objConn);
   objAdapter.Fill(objDataset); 
   DataView oView = new DataView(objDataset.Tables[0]);
   dgExcel.DataSource = oView;
   dgExcel.DataBind();
   objConn.Close();
   objConn.Dispose();
   objConn = null;
}
  }
  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {    
   this.btnGetExcel.Click += new System.EventHandler(this.btnGetExcel_Click);
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
  private void btnGetExcel_Click(object sender, System.EventArgs e)
  {
      Response.ContentType = "application/vnd.ms-excel";
    
    Response.Charset = "";
    //关闭 ViewState
    EnableViewState = false;
    System.IO.StringWriter tw = new System.IO.StringWriter();//将信息写入字符串
    System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);//在WEB窗体页上写出一系列连续的HTML特定字符和文本。
    //此类提供ASP.NET服务器控件在将HTML内容呈现给客户端时所使用的格式化功能
    //获取control的HTML
    dgExcel.RenderControl(hw);//将DATAGRID中的内容输出到HtmlTextWriter对象中
    // 把HTML写回浏览器
    Response.Write(tw.ToString());
    Response.End();
  }
 }
}
前台的页面：
<%@ Page language="c#" Codebehind="excel.aspx.cs" AutoEventWireup="false" Inherits="CommonFunction.excel" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
 <HEAD>
  <title>excel</title>
  <meta content="Microsoft Visual Studio 7.0" name="GENERATOR">
  <meta content="C#" name="CODE_LANGUAGE">
  <meta content="javascript" name="vs_defaultClientScript">
  <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
 </HEAD>
 <body MS_POSITIONING="GridLayout">
  <form id="excel" method="post" runat="server">
   <TABLE id="Table1" style="Z-INDEX: 102; LEFT: 16px; WIDTH: 288px; POSITION: absolute; TOP: 16px; HEIGHT: 178px"
    cellSpacing="1" cellPadding="1" width="288" border="0">
    <TR>
     <TD>
      <asp:datagrid id="dgExcel" runat="server" Font-Names="宋体" Font-Size="9pt" Height="100%" Width="100%"
       BorderStyle="None" BorderWidth="1px" BorderColor="#CC9966" BackColor="White" CellPadding="4">
       <SelectedItemStyle Font-Bold="True" ForeColor="#663399" BackColor="#FFCC66"></SelectedItemStyle>
       <AlternatingItemStyle BackColor="#FFCC99"></AlternatingItemStyle>
       <ItemStyle BorderWidth="2px" ForeColor="#330099" BorderStyle="Solid" BorderColor="Black" BackColor="White"></ItemStyle>
       <HeaderStyle Font-Bold="True" HorizontalAlign="Center" BorderWidth="2px" ForeColor="#FFFFCC"
        BorderStyle="Solid" BorderColor="Black" BackColor="#990000"></HeaderStyle>
      </asp:datagrid></TD>
    </TR>
    <TR>
     <TD>
      <asp:Button id="btnGetExcel" runat="server" Text="把DataGrid中的保存到Excel"></asp:Button></TD>
    </TR>
  &
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