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

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

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", "p_w_upload; 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">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
        <title>SmartGridView测试</title>
</head>
<body>
        <form id="form1" runat="server">
                <div>
                        <yyc:SmartGridView ID="SmartGridView1" runat="server" AutoGenerateColumns="False"
                                DataSourceID="ObjectDataSource1">
                                <Columns>
                                        <asp:TemplateField ItemStyle-Width="50px">
                                                <headertemplate>
                                                        <asp:Button id="btnExportToExcel" runat="server" Text="Excel" CommandName="ExportToExcel" CommandArgument="ExcelFileName;5,6" />
                                                </headertemplate>
                                                <itemtemplate>
                                                        <%# 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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转载于:https://blog.51cto.com/webabcd/345538