个人学习代码保存:例12.读取GridView文件中的数据到Excel文件

前台代码：Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" EnableEventValidation = "false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<asp:GridView ID="GridView1" runat="server">

</asp:GridView>

</div>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="导出Excel" />

</form>

</body>

</html>

后台代码：Default.aspx.cs

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;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page

{

private static string connstr=ConfigurationManager.AppSettings["ConnectionString"].ToString();

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

this.GridView1.DataSource = GetData();

this.GridView1.DataBind();

}

public DataSet GetData()

{

SqlConnection con = new SqlConnection(connstr);

if (con.State.Equals(ConnectionState.Closed))

{

con.Open();

}

string sql = "select * from guestbook";

SqlCommand cmd = new SqlCommand(sql,con);

SqlDataAdapter sda = new SqlDataAdapter(cmd);

DataSet ds = new DataSet();

sda.Fill(ds);

con.Close();

return ds;

}

// 否则会出现:类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。

public override void VerifyRenderingInServerForm(Control control)

{

// Confirms that an HtmlForm control is rendered for

}

protected void Button1_Click(object sender, EventArgs e)

{

ExportDataGrid("online/ms-excel", "ddd.xls");

}

private void ExportDataGrid(string FileType, string FileName)

{

Response.Clear();

Response.Buffer = true;

Response.Charset = "utf-7";

Response.AppendHeader("Content-Disposition", "attachment;filename=FileFlow.xls");

Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-7");

Response.ContentType = "application/ms-excel";

this.EnableViewState = false;

System.IO.StringWriter oStringWriter = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);

this.GridView1.RenderControl(oHtmlTextWriter);

Response.Write(oStringWriter.ToString());

Response.End();

}