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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""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">
<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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