GridView导入Excel的两点小技巧?

悟静 2012-02-25

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GridView导入Excel的两点小技巧?

VS2005中 GridView导入Excel的导入需要注意的几点
最近遇到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./TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www./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" >
        </asp:GridView>
    </div>
        <asp:Button ID="Button1" runat="server"  Text="导出到Excel" />
    </form>
</body>
</html>

实例代码：
/**//*

* //
*/
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();
    }
}