将DataTable海量数据导出到Excel代码,CSharp代码库,德仔网

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【CSharp】将DataTable海量数据导出到Excel
作者:jadeflute / 发布于2015/2/28/ 965
将DataTable中的大量数据导出到Excel表格中。但每张Excel表单只能有65536行，所以当DataTable数据多于65536行时，Excel要考虑分页功能。通过查阅相关资料，得到导出方法。代码在Office 2003 环境下通过。末验证其它Office版本。

	using Excel = Microsoft.Office.Interop.Excel;

	
	 public Excel.Application m_xlApp = null;

	
	 /// <summary>
	 /// 将DataTable数据导出到Excel表
	 /// </summary>
	 /// <param name="tmpDataTable">要导出的DataTable</param>
	 /// <param name="strFileName">Excel的保存路径及名称</param>
	 public void DataTabletoExcel(System.Data.DataTable tmpDataTable, string strFileName)
	 {
	 if (tmpDataTable == null)
	 {
	 return;
	 }
	 long rowNum = tmpDataTable.Rows.Count;//行数
	 int columnNum = tmpDataTable.Columns.Count;//列数
	 Excel.Application m_xlApp = new Excel.Application();
	 m_xlApp.DisplayAlerts = false;//不显示更改提示
	 m_xlApp.Visible = false;

	 Excel.Workbooks workbooks = m_xlApp.Workbooks;
	 Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
	 Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];//取得sheet1

	 try
	 {
	 if (rowNum > 65536)//单张Excel表格最大行数
	 {
	 long pageRows = 65535;//定义每页显示的行数,行数必须小于65536
	 int scount = (int)(rowNum / pageRows);//导出数据生成的表单数
	 if (scount * pageRows < rowNum)//当总行数不被pageRows整除时，经过四舍五入可能页数不准
	 {
	 scount = scount + 1;
	 }
	 for (int sc = 1; sc <= scount; sc++)
	 {
	 if (sc > 1)
	 {
	 object missing = System.Reflection.Missing.Value;
	 worksheet = (Excel.Worksheet)workbook.Worksheets.Add(
	 missing, missing, missing, missing);//添加一个sheet
	 }
	 else
	 {
	 worksheet = (Excel.Worksheet)workbook.Worksheets[sc];//取得sheet1
	 }
	 string[,] datas = new string[pageRows + 1, columnNum];

	 for (int i = 0; i < columnNum; i++) //写入字段
	 {
	 datas[0, i] = tmpDataTable.Columns[i].Caption;//表头信息
	 }
	 Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, columnNum]);
	 range.Interior.ColorIndex = 15;//15代表灰色
	 range.Font.Bold = true;
	 range.Font.Size = 9;

	 int init = int.Parse(((sc - 1) * pageRows).ToString());
	 int r = 0;
	 int index = 0;
	 int result;
	 if (pageRows * sc >= rowNum)
	 {
	 result = (int)rowNum;
	 }
	 else
	 {
	 result = int.Parse((pageRows * sc).ToString());
	 }

	 for (r = init; r < result; r++)
	 {
	 index = index + 1;
	 for (int i = 0; i < columnNum; i++)
	 {
	 object obj = tmpDataTable.Rows[r][tmpDataTable.Columns[i].ToString()];
	 datas[index, i] = obj == null ? "" : "'" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式
	 }
	 System.Windows.Forms.Application.DoEvents();
	 //添加进度条
	 }

	 Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[index + 1, columnNum]);
	 fchR.Value2 = datas;
	 worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
	 m_xlApp.WindowState = Excel.XlWindowState.xlMaximized;//Sheet表最大化
	 range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[index + 1, columnNum]);
	 //range.Interior.ColorIndex = 15;//15代表灰色
	 range.Font.Size = 9;
	 range.RowHeight = 14.25;
	 range.Borders.LineStyle = 1;
	 range.HorizontalAlignment = 1;
	 }
	 }
	 else
	 {
	 string[,] datas = new string[rowNum + 1, columnNum];
	 for (int i = 0; i < columnNum; i++) //写入字段
	 {
	 datas[0, i] = tmpDataTable.Columns[i].Caption;
	 }
	 Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, columnNum]);
	 range.Interior.ColorIndex = 15;//15代表灰色
	 range.Font.Bold = true;
	 range.Font.Size = 9;

	 int r = 0;
	 for (r = 0; r < rowNum; r++)
	 {
	 for (int i = 0; i < columnNum; i++)
	 {
	 object obj = tmpDataTable.Rows[r][tmpDataTable.Columns[i].ToString()];
	 datas[r + 1, i] = obj == null ? "" : "'" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式
	 }
	 System.Windows.Forms.Application.DoEvents();
	 //添加进度条
	 }
	 Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]);
	 fchR.Value2 = datas;

	 worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
	 m_xlApp.WindowState = Excel.XlWindowState.xlMaximized;

	 range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]);
	 //range.Interior.ColorIndex = 15;//15代表灰色
	 range.Font.Size = 9;
	 range.RowHeight = 14.25;
	 range.Borders.LineStyle = 1;
	 range.HorizontalAlignment = 1;
	 }
	 workbook.Saved = true;
	 workbook.SaveCopyAs(strFileName);
	 }
	 catch (Exception ex)
	 {
	 MessageBox.Show("导出异常：" + ex.Message, "导出异常", MessageBoxButtons.OK, MessageBoxIcon.Warning);
	 }
	 finally
	 {
	 EndReport();
	 }
	 }

	
	 /// <summary>
	 /// 退出报表时关闭Excel和清理垃圾Excel进程
	 /// </summary>
	 private void EndReport()
	 {
	 object missing = System.Reflection.Missing.Value;
	 try
	 {
	 m_xlApp.Workbooks.Close();
	 m_xlApp.Workbooks.Application.Quit();
	 m_xlApp.Application.Quit();
	 m_xlApp.Quit();
	 }
	 catch { }
	 finally
	 {
	 try
	 {
	 System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp.Workbooks);
	 System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp.Application);
	 System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp);
	 m_xlApp = null;
	 }
	 catch { }
	 try
	 {
	 //清理垃圾进程
	 this.killProcessThread();
	 }
	 catch { }
	 GC.Collect();
	 }
	 }
	 /// <summary>
	 /// 杀掉不死进程
	 /// </summary>
	 private void killProcessThread()
	 {
	 ArrayList myProcess = new ArrayList();
	 for (int i = 0; i < myProcess.Count; i++)
	 {
	 try
	 {
	 System.Diagnostics.Process.GetProcessById(int.Parse((string)myProcess[i])).Kill();
	 }
	 catch { }
	 }
	 }
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　Excel　　DataTable　　导出　
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