C#将DataTable海量数据导出到Excel .
2012-04-19 18:38 suzh 阅读(6235) 评论(0) 编辑 收藏 举报将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 { }
- }
- }