excelc#输出

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引用：通过Com 引用 Microsoft Excel 5.0 对象程序库，引用后 bin 文件夹中会出现 Interop.Excel.dll ，Microsoft.Vbe.Interop.dll ， Office.dll 三个文件。
//=====================ExcelHelper（套用模板输出Excel，并对数据进行分页）==============
using System;
using System.IO;
using System.Data;
using System.Reflection;
using System.Diagnostics;
using cfg = System.Configuration;
using Excel;
namespace ExcelHelper
{

/// <summary>
/// 功能说明：套用模板输出Excel，并对数据进行分页
/// </summary>
public class ExcelHelper
{
protected string templetFile = null;
protected string outputFile = null;
protected object missing = Missing.Value;
/// <summary>
/// 构造函数，需指定模板文件和输出文件完整路径
/// </summary>
/// <param name="templetFilePath"> Excel模板文件路径 </param>
/// <param name="outputFilePath"> 输出Excel文件路径 </param>
public ExcelHelper(string templetFilePath, string outputFilePath)
{
if (templetFilePath == null)
throw new Exception(" Excel模板文件路径不能为空！ ");
if (outputFilePath == null)
throw new Exception(" 输出Excel文件路径不能为空！ ");
if (!File.Exists(templetFilePath))
throw new Exception(" 指定路径的Excel模板文件不存在！ ");
this.templetFile = templetFilePath;
this.outputFile = outputFilePath;
}
/**/
/// <summary>
/// 将DataTable数据写入Excel文件（套用模板并分页）
/// </summary>
/// <param name="dt"> DataTable </param>
/// <param name="rows"> 每个WorkSheet写入多少行数据 </param>
/// <param name="top"> Excel中行索引 </param>
/// <param name="left"> Excel中列索引 </param>
/// <param name="sheetPrefixName"> WorkSheet前缀名，比如：前缀名为“Sheet”，那么WorkSheet名称依次为“Sheet-1，Sheet-2” </param>
public void DataTableToExcel(System.Data.DataTable dt, int rows, int top, int left, string sheetPrefixName)
{
int rowCount = dt.Rows.Count; // 源DataTable行数
int colCount = dt.Columns.Count; // 源DataTable列数
int sheetCount = this.GetSheetCount(rowCount, rows); // WorkSheet个数
DateTime beforeTime;
DateTime afterTime;
if (sheetPrefixName == null || sheetPrefixName.Trim() == "")
sheetPrefixName = " Sheet ";
// 创建一个Application对象并使其可见
beforeTime = DateTime.Now;
Excel.Application app = new Excel.ApplicationClass();
app.Visible = true;
afterTime = DateTime.Now;
// 打开模板文件，得到WorkBook对象（网上都是13个参数，现在变成14个参数了）
Excel.Workbook workBook = app.Workbooks.Open(templetFile, missing, missing, missing, missing, missing,
missing, missing, missing, missing, missing, missing, missing, missing, missing);
// 得到WorkSheet对象
Excel.Worksheet workSheet = (Excel.Worksheet)workBook.Sheets.get_Item(1);
// 复制sheetCount-1个WorkSheet对象
for (int i = 1; i < sheetCount; i++)
{
((Excel.Worksheet)workBook.Worksheets.get_Item(i)).Copy(missing, workBook.Worksheets);
}

for (int i = 1; i <= sheetCount; i++)
{
int startRow = (i - 1) * rows; // 记录起始行索引
int endRow = i * rows; // 记录结束行索引
// 若是最后一个WorkSheet，那么记录结束行索引为源DataTable行数
if (i == sheetCount)
endRow = rowCount;
// 获取要写入数据的WorkSheet对象，并重命名
Excel.Worksheet sheet = (Excel.Worksheet)workBook.Worksheets.get_Item(i);
sheet.Name = sheetPrefixName + " - " + i.ToString();
// 将dt中的数据写入WorkSheet
for (int j = 0; j < endRow - startRow; j++)
{
for (int k = 0; k < colCount; k++)
{
sheet.Cells[top + j, left + k] = dt.Rows[startRow + j][k].ToString();
}
}
//// ====================写文本框数据（有错误注释掉了）=============
//Excel.TextBox txtAuthor = (Excel.TextBox)sheet.TextBoxes(" txtAuthor ");
//Excel.TextBox txtDate = (Excel.TextBox)sheet.TextBoxes(" txtDate ");
//Excel.TextBox txtVersion = (Excel.TextBox)sheet.TextBoxes(" txtVersion ");
//txtAuthor.Text = " KLY.NET的Blog ";
//txtDate.Text = DateTime.Now.ToShortDateString();
//txtVersion.Text = " 1.0.0.0 ";

sheet.Cells[rows + 1, left + 1] = "总计：10000";
sheet.Cells[rows + 1, left + 5] = "编码：10000";
}

// 输出Excel文件并退出
try
{
//（网上是11个参数，现在是12个参数）
workBook.SaveAs(outputFile, missing, missing, missing, missing, missing, Excel.XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing, missing);
workBook.Close(null, null, null);
app.Workbooks.Close();
app.Application.Quit();
app.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(workBook);
System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
workSheet = null;
workBook = null;
app = null;
GC.Collect();
}
catch (Exception e)
{
throw e;
}
finally
{
Process[] myProcesses;
DateTime startTime;
myProcesses = Process.GetProcessesByName(" Excel ");
// 得不到Excel进程ID，暂时只能判断进程启动时间
foreach (Process myProcess in myProcesses)
{
startTime = myProcess.StartTime;
if (startTime > beforeTime && startTime < afterTime)
{
myProcess.Kill();
}
}
}
}

/**/
/// <summary>
/// 获取WorkSheet数量
/// </summary>
/// <param name="rowCount"> 记录总行数 </param>
/// <param name="rows"> 每WorkSheet行数 </param>
private int GetSheetCount(int rowCount, int rows)
{
int n = rowCount % rows; // 余数
if (n == 0)
return rowCount / rows;
else
return Convert.ToInt32(rowCount / rows) + 1;
}
}
}

使用示例：
public partial class _Default : System.Web.UI.Page
{

ExcelHelper.ExcelHelper excel =null;
protected void Page_Load(object sender, EventArgs e)
{
excel = new ExcelHelper.ExcelHelper(Server.MapPath("tempt/BJStock.xls"), Server.MapPath("ExcelFile/test.xls"));
}
protected void Button1_Click(object sender, EventArgs e)
{
excel.DataTableToExcel(DbHelperSQL.DbHelperSQL.GetDataTable("select * from excel"), 2, 1, 1, "Sheet");
Response.Redirect("ExcelFile/test.xls");
}
}