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扩展GridView控件(8) - 导出数据源的数据为Excel、Word或Text

2007-01-29 08:38 701 查看

GridView既强大又好用。为了让它更强大、更好用，我们来写一个继承自GridView的控件。
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[align=center]扩展GridView控件(8) - 导出数据源的数据为Excel、Word或Text
[/align]

作者：webabcd

/*正式版的实现开始*/

介绍

扩展GridView控件：

导出数据源的数据为Excel、Word或Text（应保证数据源的类型为DataTable或DataSet）

使用方法：

为SmartGridView添加的方法

Export(string fileName)

Export(string fileName, ExportFormat exportFormat)

Export(string fileName, ExportFormat exportFormat, Encoding encoding)

Export(string fileName, int[] columnIndexList, ExportFormat exportFormat, Encoding encoding)

Export(string fileName, int[] columnIndexList, string[] headers, ExportFormat exportFormat, Encoding encoding)
Export(string fileName, string[] columnNameList, ExportFormat exportFormat, Encoding encoding)

Export(string fileName, string[] columnNameList, string[] headers, ExportFormat exportFormat, Encoding encoding)

关键代码

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Web.UI.WebControls;

namespace YYControls

{

/**//// <summary>

/// SmartGridView类的属性部分

/// </summary>

public partial class SmartGridView

{

/**//// <summary>

/// 导出SmartGridView的数据源的数据

/// </summary>

/// <param name="fileName">文件名</param>

/// <param name="exportFormat">导出文件的格式</param>

/// <param name="encoding">编码</param>

public void Export(string fileName, ExportFormat exportFormat, Encoding encoding)

{

DataTable dt = GetDataTable();

Helper.Common.Export(dt, exportFormat, fileName, encoding);

}

/**//// <summary>

/// 导出SmartGridView的数据源的数据

/// </summary>

/// <param name="fileName">文件名</param>

/// <param name="exportFormat">导出文件的格式</param>

public void Export(string fileName, ExportFormat exportFormat)

{

Export(fileName, exportFormat, Encoding.GetEncoding("GB2312"));

}

/**//// <summary>

/// 导出SmartGridView的数据源的数据为Excel

/// </summary>

/// <param name="fileName">文件名</param>

public void Export(string fileName)

{

Export(fileName, ExportFormat.CSV);

}

/**//// <summary>

/// 导出SmartGridView的数据源的数据

/// </summary>

/// <param name="fileName">输出文件名</param>

/// <param name="columnIndexList">导出的列索引数组</param>

/// <param name="exportFormat">导出文件的格式</param>

/// <param name="encoding">编码</param>

public void Export(string fileName,int[] columnIndexList, ExportFormat exportFormat, Encoding encoding)

{

DataTable dt = GetDataTable();

Helper.Common.Export(dt, columnIndexList, exportFormat, fileName, encoding);

}

/**//// <summary>

/// 导出SmartGridView的数据源的数据

/// </summary>

/// <param name="fileName">输出文件名</param>

/// <param name="columnNameList">导出的列的列名数组</param>

/// <param name="exportFormat">导出文件的格式</param>

/// <param name="encoding">编码</param>

public void Export(string fileName, string[] columnNameList, ExportFormat exportFormat, Encoding encoding)

{

DataTable dt = GetDataTable();

Helper.Common.Export(dt, columnNameList, exportFormat, fileName, encoding);

}

/**//// <summary>

/// 导出SmartGridView的数据源的数据

/// </summary>

/// <param name="fileName">输出文件名</param>

/// <param name="columnIndexList">导出的列索引数组</param>

/// <param name="headers">导出的列标题数组</param>

/// <param name="exportFormat">导出文件的格式</param>

/// <param name="encoding">编码</param>

public void Export(string fileName, int[] columnIndexList, string[] headers, ExportFormat exportFormat, Encoding encoding)

{

DataTable dt = GetDataTable();

Helper.Common.Export(dt, columnIndexList, headers, exportFormat, fileName, encoding);

}

/**//// <summary>

/// 导出SmartGridView的数据源的数据

/// </summary>

/// <param name="fileName">输出文件名</param>

/// <param name="columnNameList">导出的列的列名数组</param>

/// <param name="headers">导出的列标题数组</param>

/// <param name="exportFormat">导出文件的格式</param>

/// <param name="encoding">编码</param>

public void Export(string fileName, string[] columnNameList, string[] headers, ExportFormat exportFormat, Encoding encoding)

{

DataTable dt = GetDataTable();

Helper.Common.Export(dt, columnNameList, headers, exportFormat, fileName, encoding);

}

/**//// <summary>

/// 获取数据源（DataTable）

/// </summary>

private DataTable GetDataTable()

{

DataTable dt = null;

if (this._dataSourceObject is DataTable)

dt = (DataTable)this._dataSourceObject;

else if (this._dataSourceObject is DataSet)

dt = ((DataSet)this._dataSourceObject).Tables[0];

else

throw new InvalidCastException("若要导出SmartGridView，应保证其数据源为DataTable或DataSet类型");

if (dt == null)

throw new ArgumentNullException("数据源", "数据源不能为NULL");

return dt;

}

/*正式版的实现结束*/

/*测试版的实现开始*/

介绍

把GridView导出为一个Excel文件算是一个经常要用到的功能，也比较简单，我们来扩展一个GridView以实现这样的功能。

控件开发

1、新建一个继承自GridView的类。

/**//// <summary>

/// 继承自GridView

/// </summary>

[ToolboxData(@"<{0}:SmartGridView runat='server'></{0}:SmartGridView>")]

public class SmartGridView : GridView

{

}

2、重写OnRowCommand，以实现把GridView导出为Excel的功能

/**//// <summary>

/// OnRowCommand

/// </summary>

/// <param name="e"></param>

protected override void OnRowCommand(GridViewCommandEventArgs e)

{

if (e.CommandName.ToLower() == "exporttoexcel")

{

System.Web.HttpContext.Current.Response.ClearContent();

// e.CommandArgument用“;”隔开两部分，左边的部分为导出Excel的文件名称

System.Web.HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=" + e.CommandArgument.ToString().Split(';')[0] + ".xls");

System.Web.HttpContext.Current.Response.ContentType = "application/excel";

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

HtmlTextWriter htw = new HtmlTextWriter(sw);

// e.CommandArgument用“;”隔开两部分，右边的部分为需要隐藏的列的索引（列索引用“,”分开）

if (e.CommandArgument.ToString().Split(';').Length > 1)

{

foreach (string s in e.CommandArgument.ToString().Split(';')[1].Split(','))

{

int i;

if (!Int32.TryParse(s, out i))

{

throw new ArgumentException("需要隐藏的列的索引不是整数");

}

if (i > this.Columns.Count)

{

throw new ArgumentOutOfRangeException("需要隐藏的列的索引超出范围");

}

this.Columns[i].Visible = false;

}

// 隐藏“导出Excel”按钮

((Control)e.CommandSource).Visible = false;

// 如果HeaderRow里的控件是button的话，则把它替换成文本

foreach (TableCell tc in this.HeaderRow.Cells)

{

// TableCell里的每个Control

foreach (Control c in tc.Controls)

{

// 如果控件继承自接口IButtonControl

if (c.GetType().GetInterface("IButtonControl") != null && c.GetType().GetInterface("IButtonControl").Equals(typeof(IButtonControl)))

{

// 如果该控件不是“导出Excel”按钮则把button转换成文本

if (!c.Equals(e.CommandSource))

{

tc.Controls.Clear();

tc.Text = ((IButtonControl)c).Text;

}

// 将服务器控件的内容输出到所提供的 System.Web.UI.HtmlTextWriter 对象中

this.RenderControl(htw);

System.Web.HttpContext.Current.Response.Write(sw.ToString());

System.Web.HttpContext.Current.Response.End();

}

base.OnRowCommand(e);

}

控件使用

添加这个控件到工具箱里，然后拖拽到webform上，在GridView内加一个按钮，把CommandName属性设置为“ExportToExcel”，CommandArgument属性的值用“;”做分隔符分为两部分，左边的部分为导出Excel的文件名称，右边的部分为需要隐藏的列的索引（列索引用“,”分开）

ObjData.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.ComponentModel;

/**//// <summary>

/// OjbData 的摘要说明

/// </summary>

public class OjbData

{

public OjbData()

{

// TODO: 在此处添加构造函数逻辑

}

[DataObjectMethod(DataObjectMethodType.Select, true)]

public DataTable Select()

{

DataTable dt = new DataTable();

dt.Columns.Add("no", typeof(string));

dt.Columns.Add("name", typeof(string));

for (int i = 0; i < 30; i++)

{

DataRow dr = dt.NewRow();

dr[0] = "no" + i.ToString().PadLeft(2, '0');

dr[1] = "name" + i.ToString().PadLeft(2, '0');

dt.Rows.Add(dr);

}

return dt;

}

Default.aspx

@ 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">

<title>SmartGridView测试</title>

</head>

<body>

<div>

<yyc:SmartGridView ID="SmartGridView1" runat="server" AutoGenerateColumns="False"

DataSourceID="ObjectDataSource1">

<asp:TemplateField ItemStyle-Width="50px">

<asp:Button id="btnExportToExcel" runat="server" Text="Excel" CommandName="ExportToExcel" CommandArgument="ExcelFileName;5,6" />

</headertemplate>

# Container.DataItemIndex + 1 %>

</itemtemplate>

</asp:TemplateField>

<asp:BoundField DataField="no" HeaderText="序号" SortExpression="no" ItemStyle-Width="100px" />

<asp:BoundField DataField="name" HeaderText="名称" SortExpression="name" ItemStyle-Width="100px" />

<asp:BoundField DataField="no" HeaderText="序号" SortExpression="no" ItemStyle-Width="100px" />

<asp:BoundField DataField="name" HeaderText="名称" SortExpression="name" ItemStyle-Width="100px" />

<asp:BoundField DataField="no" HeaderText="序号" SortExpression="no" ItemStyle-Width="100px" />

<asp:BoundField DataField="name" HeaderText="名称" SortExpression="name" ItemStyle-Width="100px" />

</Columns>

</yyc:SmartGridView>

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="Select"

TypeName="OjbData"></asp:ObjectDataSource>

</div>

</form>

</body>

</html>

注：为了防止出错要在.cs代码中加上下面这句

public override void VerifyRenderingInServerForm(Control control)

{

}

另外，如果你的GridView中含有命令按钮的话要在.aspx页面的头部中加上下面这个属性

EnableEventValidation="false"

/*测试版的实现结束*/

OK
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