2.建立操作动态链接库的共通类，方便调用。（ExcelHelper）
具体如下：
复制代码 代码如下:
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Reflection;
using System.Diagnostics;
using System.Collections;
/// <summary>
///ExcelHelper 的摘要说明
/// </summary>
public class ExcelHelper
{
private string reportModelPath = null;
private string outPutFilePath = null;
private object missing = Missing.Value;
Excel.Application app;
Excel.Workbook workBook;
Excel.Worksheet workSheet;
Excel.Range range;
/// <summary>
/// 获取或设置报表模板路径
/// </summary>
public string ReportModelPath
{
get { return reportModelPath; }
set { reportModelPath = value; }
}
/// <summary>
/// 获取或设置输出路径
/// </summary>
public string OutPutFilePath
{
get { return outPutFilePath; }
set { outPutFilePath = value; }
}
public ExcelHelper()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
/// 带参ExcelHelper构造函数
/// </summary>
/// <param name="reportModelPath">报表模板路径</param>
/// <param name="outPutFilePath">输出路径</param>
public ExcelHelper(string reportModelPath, string outPutFilePath)
{
//路径验证
if (null == reportModelPath || ("").Equals(reportModelPath))
throw new Exception("报表模板路径不能为空！");
if (null == outPutFilePath || ("").Equals(outPutFilePath))
throw new Exception("输出路径不能为空！");
if (!File.Exists(reportModelPath))
throw new Exception("报表模板路径不存在！");
//设置路径值
this.ReportModelPath = reportModelPath;
this.OutPutFilePath = outPutFilePath;
//创建一个应用程序对象
app = new Excel.ApplicationClass();
//打开模板文件，获取WorkBook对象
workBook = app.Workbooks.Open(reportModelPath, missing, missing, missing, missing, missing, missing,
missing, missing, missing, missing, missing, missing);
//得到WorkSheet对象
workSheet = workBook.Sheets.get_Item(1) as Excel.Worksheet;
}
/// <summary>
/// 给单元格设值
/// </summary>
/// <param name="rowIndex">行索引</param>
/// <param name="colIndex">列索引</param>
/// <param name="content">填充的内容</param>
public void SetCells(int rowIndex,int colIndex,object content)
{
if (null != content)
{
content = content.ToString();
}
else
{
content = string.Empty;
}
try
{
workSheet.Cells[rowIndex, colIndex] = content;
}
catch
{
GC();
throw new Exception("向单元格[" + rowIndex + "," + colIndex + "]写数据出错！");
}
}
/// <summary>
/// 保存文件
/// </summary>
public void SaveFile()
{
try
{
workBook.SaveAs(outPutFilePath, missing, missing, missing, missing, missing,
Excel.XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing);
}
catch
{
throw new Exception("保存至文件失败！");
}
finally
{
Dispose();
}
}
/// <summary>
/// 垃圾回收处理
/// </summary>
protected void GC()
{
if (null != app)
{
int generation = 0;
System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
generation = System.GC.GetGeneration(app);
System.GC.Collect(generation);
app = null;
missing = null;
}
}
/// <summary>
/// 释放资源
/// </summary>
protected void Dispose()
{
workBook.Close(null, null, null);
app.Workbooks.Close();
app.Quit();
if (null != workSheet)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);
workSheet = null;
}
if (workBook != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workBook);
workBook = null;
}
if (app != null)
{
int generation = 0;
System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
generation = System.GC.GetGeneration(app);
System.GC.Collect(generation);
app = null;
missing = null;
}
}
}
通过ExcelHelper类提供的SetCells()和SaveFile()方法可以给Excel单元格赋值并保存到临时文件夹内。仅供参考。
3.调用
因为这里需要用到导出模板，所以需要先建立模板。具体如下：、
复制代码 代码如下:
/// <summary>
/// 导出数据
/// </summary>
protected void Export_Data()
{
int ii = 0;
//取得报表模板文件路径
string reportModelPath = HttpContext.Current.Server.MapPath("ReportModel/导出订单模板.csv");
//导出报表文件名
fileName = string.Format("{0}-{1}{2}.csv", "导出订单明细", DateTime.Now.ToString("yyyyMMdd"), GetRndNum(3));
//导出文件路径
string outPutFilePath = HttpContext.Current.Server.MapPath("Temp_Down/" + fileName);
//创建Excel对象
ExcelHelper excel = new ExcelHelper(reportModelPath, outPutFilePath);
SqlDataReader sdr = Get_Data();
while (sdr.Read())
{
ii++;
excel.SetCells(1 + ii, 1, ii);
excel.SetCells(1 + ii, 2, sdr["C_Name"]);
excel.SetCells(1 + ii, 3, sdr["C_Mtel"]);
excel.SetCells(1 + ii, 4, sdr["C_Tel"]);
excel.SetCells(1 + ii, 5, sdr["C_Province"]);
excel.SetCells(1 + ii, 6, sdr["C_Address"]);
excel.SetCells(1 + ii, 7, sdr["C_Postcode"]);
}
sdr.Close();
excel.SaveFile();
}
关于导出就简单写到这，另外下一节讲介绍如何通过这个类库上传Excel文件。 作者:WILLPAN
