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在VS2005中GridView导入Excel的两点小技巧

2007-09-19 16:24 405 查看

VS2005中 GridView导入Excel的导入需要注意的几点
最近带的项目遇到GridView导入Excel问题，总结出几点：
1、如果出现下面的错误提示可用重载VerifyRenderingInServerForm方法解决。
错误提示:
类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
在后台文件中重载VerifyRenderingInServerForm方法,如:

public override void VerifyRenderingInServerForm(Control control)
{
//base.VerifyRenderingInServerForm(control);
}

2、如果设置为 GetEncoding("GB2312"),导出的文件将会出现乱码。
可用Response.ContentEncoding = System.Text.Encoding.UTF7;
或者Encoding.UTF8等来解决，不过导入格式和字体上个人感觉UTF7比UTF8效果好些；
因人而异了：）

相关代码如下：

Web.config配置： <?xml version="1.0"?>
<configuration>
<appSettings>

<add key="ConnectionString" value="data source=.;initial catalog=Northwind;user id=sa;password=sa;persist security info=true;packet size=4096"/>
</appSettings>
<connectionStrings/>
<system.web>
<compilation debug="true"/>
<authentication mode="Windows"/>
</system.web>
</configuration>

ASPX页面代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AllowPaging="true" OnPageIndexChanging="Paging">
</asp:GridView>
</div>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="导出到Excel" />
</form>
</body>
</html>

实例代码：
/**//*
* // by XiaoYin [10/22/2006]
*/
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;
using System.Xml;

public partial class _Default : System.Web.UI.Page
{
/**//// <summary>
/// 链接字符串
/// </summary>
public string ConnectString
{
get
{
return ConfigurationManager.AppSettings["ConnectionString"];
}
}

/**//// <summary>
/// 重载VerifyRenderingInServerForm方法
/// 确认在运行时为指定的 ASP.NET 服务器控件呈现 HtmlForm 控件。
/// </summary>
/// <param name="control">ASP.NET 服务器控件，它必须位于 HtmlForm 控件中</param>
public override void VerifyRenderingInServerForm(Control control)
{
//base.VerifyRenderingInServerForm(control);
}

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindData();
}
}

/**//// <summary>
/// 绑定数据
/// </summary>
public void BindData()
{
// 查询
string query = "SELECT * FROM Categories";
SqlConnection myConnection = new SqlConnection(ConnectString);
SqlDataAdapter ad = new SqlDataAdapter(query, myConnection);
DataSet ds = new DataSet();
ad.Fill(ds, "Categories");
GridView1.DataSource = ds;
GridView1.DataBind();
}

/**//// <summary>
/// 内存分页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Paging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
BindData();
}

protected void Button1_Click(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.Charset = "GB2312";
Response.AppendHeader("Content-Disposition", "attachment;filename=FileName.xls");
//gaoyang [10/21/2006] 经测试如果设置为 GetEncoding("GB2312"),导出的文件将会出现乱码。
Response.ContentEncoding = System.Text.Encoding.UTF7;

//设置输出文件类型为excel文件。
Response.ContentType = "application/ms-excel";
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
this.GridView1.RenderControl(oHtmlTextWriter);
Response.Output.Write(oStringWriter.ToString());
Response.Flush();
Response.End();
}
}

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