ASP.Net 2.0: Export GridView to Excel
【原文见: http://www.c-sharpcorner.com/UploadFile/DipalChoksi/exportxl_asp2_dc11032006003657AM/exportxl_asp2_dc.aspx】
Author: Dipal Choksi
Translator: SPARON
T-Blog: http://sparon.cnblogs.com
T-MSN: ZhaoKeYong@hotmail.com
本文描述了在ASP.NET 2.0中如何将GridView 导出为 Excel
简介:
在本文中我们将具体介绍如何将ASP.Net 2.0下的GridView导出为Excel.
本文的焦点是Gridview导为Excel功能和它的数据绑定只出口示范功能.
本文代码可以用来导出为Excel的功能但不局限于这个部分,还可以在很多项目中使用。
Step 1: Setup your web page with the Gridview
这里我假定你满足:在一个页面中有个名为GridView1的GridView。在GridView中我们绑定了一个名为ContactPhone的SQL数据库。接下来的代码就是如何将GridView导出为Excel并且不依赖于具体的数据绑定还具有场景自改变能力。
ContactPhone Table Structure:
Column Name
|
Type
|
ContactID
|
Int (Identity)
|
FName
|
Varchar(50)
|
LName
|
Varchar(50)
|
ContactPhone
|
Varchar(20)
|
Step: The Actual Export
这段代码是直接输出为Excel的,你也可以改变content-disposition和ContentType以输出不同的类型。
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string attachment = "attachment; filename=Contacts.xls";
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Response.ClearContent();
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Response.AddHeader("content-disposition", attachment);
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Response.ContentType = "application/ms-excel";
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StringWriter sw = new StringWriter();
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HtmlTextWriter htw = new HtmlTextWriter(sw);
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GridView1.RenderControl(htw);
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Response.Write(sw.ToString());
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Response.End();
18![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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如果你运行以上代码,将返回一个HttpException:
'GridView1'是一个类型为'GridView'的控件,必须为其添加一个runat=server标记.
为避免这个错误,我们添加以下代码:
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public override void VerifyRenderingInServerForm(Control control)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
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}
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Step : Convert the contents
如果GridView中有其它控件,比如Checkboxes,Dropdownlists,我们需要将它转换为其相关的值,以下递归就用于导出Excel前的准备工作,将各类控件转换为其相关值.
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private void PrepareGridViewForExport(Control gv)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
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LinkButton lb = new LinkButton();
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Literal l = new Literal();
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string name = String.Empty;
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for (int i = 0; i < gv.Controls.Count; i++)
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{
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if (gv.Controls[i].GetType() == typeof(LinkButton))
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{
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l.Text = (gv.Controls[i] as LinkButton).Text;
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gv.Controls.Remove(gv.Controls[i]);
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gv.Controls.AddAt(i, l);
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}
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else if (gv.Controls[i].GetType() == typeof(DropDownList))
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{
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l.Text = (gv.Controls[i] as DropDownList).SelectedItem.Text;
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gv.Controls.Remove(gv.Controls[i]);
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gv.Controls.AddAt(i, l);
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}
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else if (gv.Controls[i].GetType() == typeof(CheckBox))
40![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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{
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l.Text = (gv.Controls[i] as CheckBox).Checked? "True" : "False";
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gv.Controls.Remove(gv.Controls[i]);
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gv.Controls.AddAt(i, l);
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}
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if (gv.Controls[i].HasControls())
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{
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PrepareGridViewForExport(gv.Controls[i]);
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}
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}
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Code Listing:
Image: Page Design
![](https://www.cnblogs.com/images/cnblogs_com/sparon/A1.jpg)
Image : Sample in action
![](https://www.cnblogs.com/images/cnblogs_com/sparon/a_2.jpg)
Image: Export to Excel button is clicked
![](https://www.cnblogs.com/images/cnblogs_com/sparon/a_3.jpg)
Image: GridView contents exported to Excel
![](https://www.cnblogs.com/images/cnblogs_com/sparon/a_4.jpg)
ExcelExport.aspx
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
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1![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
<%
@ Page Language="C#" AutoEventWireup="true" CodeFile="ExportExcel.aspx.cs" Inherits="DeleteConfirm" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>Contacts Listing</title>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<strong><span style="font-size: small; font-family: Arial; text-decoration: underline">
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Contacts Listing
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<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Export To Excel" /></span></strong><br />
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<br />
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<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ContactID"
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DataSourceID="SqlDataSource1" EmptyDataText="There are no data records to display." style="font-size: small; font-family: Arial" BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" ForeColor="Black" GridLines="Vertical">
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<Columns>
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<asp:BoundField DataField="ContactID" HeaderText="ContactID" ReadOnly="True" SortExpression="ContactID" Visible="False" />
38![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<asp:BoundField DataField="FName" HeaderText="First Name" SortExpression="FName" />
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<asp:BoundField DataField="LName" HeaderText="Last Name" SortExpression="LName" />
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<asp:BoundField DataField="ContactPhone" HeaderText="Phone" SortExpression="ContactPhone" />
44![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<asp:TemplateField HeaderText="Favorites">
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<ItemTemplate>
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<asp:CheckBox ID="CheckBox1" runat="server" />
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</ItemTemplate></asp:TemplateField>
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</Columns>
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<FooterStyle BackColor="#CCCC99" />
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<RowStyle BackColor="#F7F7DE" />
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<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
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<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
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<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
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<AlternatingRowStyle BackColor="White" />
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</asp:GridView>
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<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ContactsConnectionString1 %>"
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DeleteCommand="DELETE FROM [ContactPhone] WHERE [ContactID] = @ContactID" InsertCommand="INSERT INTO [ContactPhone] ([FName], [LName], [ContactPhone]) VALUES (@FName, @LName, @ContactPhone)"
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ProviderName="<%$ ConnectionStrings:ContactsConnectionString1.ProviderName %>"
78![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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SelectCommand="SELECT [ContactID], [FName], [LName], [ContactPhone] FROM [ContactPhone]"
80![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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UpdateCommand="UPDATE [ContactPhone] SET [FName] = @FName, [LName] = @LName, [ContactPhone] = @ContactPhone WHERE [ContactID] = @ContactID">
82![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<InsertParameters>
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<asp:Parameter Name="FName" Type="String" />
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<asp:Parameter Name="LName" Type="String" />
88![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<asp:Parameter Name="ContactPhone" Type="String" />
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</InsertParameters>
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<UpdateParameters>
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<asp:Parameter Name="FName" Type="String" />
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<asp:Parameter Name="LName" Type="String" />
98![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<asp:Parameter Name="ContactPhone" Type="String" />
100![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<asp:Parameter Name="ContactID" Type="Int32" />
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</UpdateParameters>
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<DeleteParameters>
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<asp:Parameter Name="ContactID" Type="Int32" />
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</DeleteParameters>
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</asp:SqlDataSource>
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<br />
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</div>
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</form>
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</body>
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</html>
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ExcelExport.aspx.cs
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.Text;
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using System.IO;
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public partial class DeleteConfirm : System.Web.UI.Page
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29![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
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protected void Page_Load(object sender, EventArgs e)
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35![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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}
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protected void Button1_Click(object sender, EventArgs e)
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43![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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//Export the GridView to Excel
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PrepareGridViewForExport(GridView1);
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ExportGridView();
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}
52![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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private void ExportGridView()
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{
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string attachment = "attachment; filename=Contacts.xls";
60![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Response.ClearContent();
62![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Response.AddHeader("content-disposition", attachment);
64![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Response.ContentType = "application/ms-excel";
66![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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StringWriter sw = new StringWriter();
68![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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HtmlTextWriter htw = new HtmlTextWriter(sw);
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GridView1.RenderControl(htw);
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Response.Write(sw.ToString());
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Response.End();
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}
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public override void VerifyRenderingInServerForm(Control control)
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{
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}
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private void PrepareGridViewForExport(Control gv)
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{
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LinkButton lb = new LinkButton();
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Literal l = new Literal();
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string name = String.Empty;
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for (int i = 0; i < gv.Controls.Count; i++)
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{
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if (gv.Controls[i].GetType() == typeof(LinkButton))
104![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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{
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l.Text = (gv.Controls[i] as LinkButton).Text;
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gv.Controls.Remove(gv.Controls[i]);
110![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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gv.Controls.AddAt(i, l);
112![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
114![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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else if (gv.Controls[i].GetType() == typeof(DropDownList))
116![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
117![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
118![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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l.Text = (gv.Controls[i] as DropDownList).SelectedItem.Text;
120![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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gv.Controls.Remove(gv.Controls[i]);
122![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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gv.Controls.AddAt(i, l);
124![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
126![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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else if (gv.Controls[i].GetType() == typeof(CheckBox))
128![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
129![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
130![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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l.Text = (gv.Controls[i] as CheckBox).Checked ? "True" : "False";
132![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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gv.Controls.Remove(gv.Controls[i]);
134![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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gv.Controls.AddAt(i, l);
136![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
138![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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if (gv.Controls[i].HasControls())
140![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
141![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
142![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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PrepareGridViewForExport(gv.Controls[i]);
144![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
146![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
148![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
150![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
152![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
153![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
Implementation Options:
通常情况,在输出函数中开发人员都会面临一个错误,典型的就是"RegisterForEventValidation can only be called during Render();"
访问者通常会在评论中提出一些好的建议.我特别要强调的是开发者需要重写VerifyRenderingInServerForm方法,该方法描述如下:
- Step 1:实现导出功能的上述功能.
- Step 2:重写一个VerifyRenderingInServerForm的空方法.
- Step 3:修改ExportGridView函数,在绿色高亮代码部创建HtmlForm【原句为:The code highlighted in green creates and HtmlForm on the fly,在翻译HtmlForm on the fly时遇到了一些困难,故on the fly未翻译,请各位高手指教】,在导出girdview之前,添加gridview 到新的form并且render它(取代原来的render实现)
1
private void ExportGridView()
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
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string attachment = "attachment; filename=Contacts.xls";
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Response.ClearContent();
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Response.AddHeader("content-disposition", attachment);
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Response.ContentType = "application/ms-excel";
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StringWriter sw = new StringWriter();
14![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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HtmlTextWriter htw = new HtmlTextWriter(sw);
16![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// Create a form to contain the grid
20![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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HtmlForm frm = new HtmlForm();
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GridView1.Parent.Controls.Add(frm);
24![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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frm.Attributes["runat"] = "server";
26![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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frm.Controls.Add(GridView1);
28![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
29
30![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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frm.RenderControl(htw);
32![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//GridView1.RenderControl(htw);
34![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Response.Write(sw.ToString());
36![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Response.End();
38![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
40![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
41![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
这样实施有个优势,就是可将其设置为复用代码类库,不用每次去复写基类的方法.
Note to readers:
Thank you for your comments and feedback! Happy coding!!!
ASP.Net 2.0: Export GridView to Excel - Part II
该文中将会在导出Excel 时GridView引入Hyperlink列,以至于需要使用更多的反射来重新设计原来的逻辑.