将(Oracle)数据库表导出到Excel，并生成文件（C#实现）

将(Oracle)数据库表导出到Excel，并生成文件（C#实现）

关键词： C#, ASP.NET, Excel

需添加项目引用：

1. .NET->System.Data.OracleClient.dll

2. COM->Microsoft Excel 11.0 Object Library

代码如下：

using System;
using System.IO;
using System.Data;
using System.Reflection;
using System.Diagnostics;
using System.Configuration;
using System.Collections;
using Excel;

namespace thscjy
{
///
/// 套用模板输出Excel，生成xls文件和html文件
/// Author: Liu Wen
/// Date Created: 2006-8
///
public class ExportExcel
{
#region variable member 成员变量
protected string templateFile = null;
protected string excelFile = null;
protected string htmlFile = null;
protected object missing = Missing.Value;
Excel.ApplicationClass app;
Excel.Workbook book;
Excel.Worksheet sheet;
Excel.Range range;
private DateTime beforeTime; //Excel启动之前时间
private DateTime afterTime; //Excel启动之后时间
//private int processID;
#endregion

///
/// 构造函数，将一个已有Excel工作簿作为模板，并指定输出路径
///
/// Excel模板文件路径

/// Excel输出文件路径

/// Html输出文件路径

public ExportExcel(string templateFile, string excelFile, string htmlFile)
{
if (templateFile == null)
throw new Exception("Excel模板文件路径不能为空！");

if (excelFile == null)
throw new Exception("Excel输出文件路径不能为空！");

if (htmlFile == null)
throw new Exception("Html输出文件路径不能为空！");

if (!File.Exists(templateFile))
throw new Exception("指定路径的Excel模板文件不存在！");

this.templateFile = templateFile;
this.excelFile = excelFile;
this.htmlFile = htmlFile;

//创建一个Application对象
beforeTime = DateTime.Now;
app = new ApplicationClass();
//app.Visible = true;
//processID = Process.GetCurrentProcess().Id;
afterTime = DateTime.Now;

//打开模板文件，得到WorkBook对象
try
{
book = app.Workbooks.Open(templateFile,missing,missing,missing,missing,missing,
missing,missing,missing,missing,missing,missing,missing,missing,missing);
}
catch (Exception e)
{
throw e;
}
//得到WorkSheet对象
sheet = (Excel.Worksheet)book.Sheets.get_Item(1);
}

#region 插入报表参数
///
/// 录入报表的参数（TJ统计用）
///
/// 填报单位

/// 年月

/// 填报人

/// 填报日期

/// 插入数据的单元格

public void InsertArgs(string department, string date, string accountant, string dateCreated, string cellID)
{
sheet.get_Range("A3", missing).Value2 = "填报单位："+department;
sheet.get_Range("D3", missing).Value2 = date;
sheet.get_Range(cellID, missing).Value2 = "部门负责人：　　　　　　　填报人："+accountant+"　联系电话： 报送时间："+dateCreated;
//sheet.get_Range("I8", missing).Value2 = "填报日期："+dateCreated;
}

///
/// 录入报表的参数（JH计划用）
///
/// 标题

public void InsertArgsJH(string name)
{
sheet.get_Range("A1", missing).Value2 = name;
}

///
/// 录入报表的参数（JH计划用）
///
/// 标题

/// 年份

public void InsertArgsJH(string name, string year)
{
sheet.get_Range("A1", missing).Value2 = name;
sheet.get_Range("D2", missing).Value2 = year;
}

///
/// 录入报表的参数（JH计划用）
///
/// 标题

/// 部门

/// “部门”单元格ID

/// 年份

/// “年份”单元格ID

public void InsertArgsJH(string name, string department, string depCellId, string year, string yearCellId)
{
sheet.get_Range("A1", missing).Value2 = name;
sheet.get_Range(depCellId, missing).Value2 = department;
sheet.get_Range(yearCellId, missing).Value2 = year;
}

///
/// 录入报表的参数（JH计划用）
///
/// 标题

/// 注水

/// 注气

/// 措施工作量

public void InsertArgsJH(string name, string water, string gas, string workload)
{
sheet.get_Range("A1", missing).Value2 = name;
sheet.get_Range("C2", missing).Value2 = water;
sheet.get_Range("E2", missing).Value2 = gas;
sheet.get_Range("G2", missing).Value2 = workload;
}
#endregion

#region 导出Excel方法

///
/// 将DataTable数据导出到Excel（可动态插入行）
///
/// DataTable

/// 插入行的索引

/// 插入列的索引

public void DataTableToExcel(System.Data.DataTable dt, int rowIndex, int colIndex)
{
int rowCount = dt.Rows.Count; //DataTable行数
int colCount = dt.Columns.Count; //DataTable列数
int iRow;
int iCol;

//将数据导出到相应的单元格
for (iRow = 0; iRow < rowCount; iRow++)
{
//插入新行
this.InsertRows(sheet, iRow+rowIndex);
//填充当前行
for (iCol = 0; iCol < colCount; iCol++)
{
sheet.Cells[iRow+rowIndex, iCol+colIndex] = dt.Rows[iRow][iCol].ToString();
}
}
this.DeleteRows(sheet, rowCount+rowIndex);

//this.OutputFile();

//Excel.QueryTables qts = sheet.QueryTables;
//Excel.QueryTable qt = qts.Add(,,);
//qt.RefreshStyle = Excel.XlCellInsertionMode.xlInsertEntireRows;
//qt.Refresh();
}

///
/// 将DataTable数据导出到Excel（可动态插入行）
///
/// DataTable

/// 插入数据的起始单元格

public void DataTableToExcel(System.Data.DataTable dt, string cellID)
{
int rowIndex = sheet.get_Range(cellID, missing).Row;
int colIndex = sheet.get_Range(cellID, missing).Column;
int rowCount = dt.Rows.Count; //DataTable行数
int colCount = dt.Columns.Count; //DataTable列数
int iRow;
int iCol;

//利用二维数组批量写入
string[,] array = new string[rowCount,colCount];
for (iRow = 0; iRow < rowCount; iRow++)
{
for (iCol = 0; iCol < colCount; iCol++)
{
array[iRow,iCol] = dt.Rows[iRow][iCol].ToString();
}
}

for (iRow = 0; iRow < rowCount; iRow++)
{
this.InsertRows(sheet, iRow+rowIndex);
}
this.DeleteRows(sheet, rowCount+rowIndex);

range = sheet.get_Range(cellID, missing);
range = range.get_Resize(rowCount, colCount);
range.Value2 = array;
}

///
/// 将DataTable数据导出到Excel（固定）
///
/// DataTable

/// 插入数据的起始单元格

public void DataTableToExcel2(System.Data.DataTable dt, string cellID)
{
int rowCount = dt.Rows.Count; //DataTable行数
int colCount = dt.Columns.Count; //DataTable列数
int iRow;
int iCol;

//利用二维数组批量写入
string[,] array = new string[rowCount,colCount];
for (iRow = 0; iRow < rowCount; iRow++)
{
for (iCol = 0; iCol < colCount; iCol++)
{
array[iRow,iCol] = dt.Rows[iRow][iCol].ToString();
}
}

range = sheet.get_Range(cellID, missing);
range = range.get_Resize(rowCount, colCount);
range.Value2 = array;
}
#endregion

///
/// 最后调用，释放相关资源，完成
///
public void Finalize()
{
this.OutputFile();
GC.Collect();
//this.KillExcelProcess();
}

///
/// 输出生成的Excel, Html文件
///
private void OutputFile()
{
//如果文件已存在，删除，重新生成
if (File.Exists(excelFile))
{
File.Delete(excelFile);
}
if (File.Exists(htmlFile))
{
File.Delete(htmlFile);
}
try
{
book.SaveAs(excelFile, missing, missing, missing, missing, missing,
Excel.XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing,missing);

book.SaveAs(htmlFile, Excel.XlFileFormat.xlHtml, missing, missing, missing, missing,
Excel.XlSaveAsAccessMode.xlNoChange, missing, missing, missing, missing, missing);
}
catch (Exception e)
{
throw e;
}
finally
{
this.Dispose();
}
}

///
/// 在工作表中插入行，并调整其他行以留出空间
///
/// 当前工作表

/// 欲插入的行索引

private void InsertRows(Excel.Worksheet sheet, int rowIndex)
{
range = (Excel.Range)sheet.Rows[rowIndex, missing];
//object Range.Insert(object shift, object copyorigin);
//shift: Variant类型，可选。指定单元格的调整方式。可以为下列 XlInsertShiftDirection 常量之一：
//xlShiftToRight 或 xlShiftDown。如果省略该参数，Microsoft Excel 将根据区域形状确定调整方式。
range.Insert(Excel.XlInsertShiftDirection.xlShiftDown, missing);
}

///
/// 在工作表中删除行
///
/// 当前工作表

/// 欲删除的行索引

private void DeleteRows(Excel.Worksheet sheet, int rowIndex)
{
range = (Range)sheet.Rows[rowIndex, missing];
range.Delete(Excel.XlDeleteShiftDirection.xlShiftUp);
}

///
/// 退出Excel，并且释放调用的COM资源
///
private void Dispose()
{
book.Close(missing, missing, missing);
app.Workbooks.Close();
app.Quit();

if (range != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
range = null;
}
if (sheet != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
sheet = null;
}
if (book != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
book = null;
}
if (app != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
app = null;
}

//System.GC.Collect();
//GC.WaitForPendingFinalizers();
//this.KillExcelProcess();
//Process pro = Process.GetProcessById(processID);
//pro.Kill();
}

///
/// 结束Excel进程
///
private void KillExcelProcess()
{
DateTime startTime;
Process[] processes = Process.GetProcessesByName("Excel");

//得不到Excel进程ID，暂时只能判断进程启动时间
foreach (Process process in processes)
{
startTime = process.StartTime;
if(startTime > beforeTime && startTime < afterTime)
{
process.Kill();
}
}
}

}
}