(1) OleDb： 用這種方法讀取Excel速度還是非常的快的，但這種方式讀取數據的時候不太靈活，不過可以在 DataTable 中對數據進行一些刪減修改
這種方式將Excel作為一個數據源，直接用Sql語句獲取數據了。所以讀取之前要知道此次要讀取的Sheet（當然也可以用序號，類似dt.Row[0][0]。這樣倒是不需要知道Sheet）
if (fileType == ".xls") connStr = " else connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=/"Excel 12.0;HDR=YES;IMEX=1/"";OleDbConnection conn new OleDbConnection(connStr);DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); |
以上是讀取Excel的Sheet名，xls和xlsx的連接字符串也不一樣的，可以根據文件的后綴來區別。這里需要注意的一點，Excel里面只有一個Sheet，但通過這種方式讀取Sheet可能會大于一個。原因已經有人在別的網站說過了，偷一下懶O(∩_∩)O，下面文段來自【cdwolfling】
【在使用過程中發現取出的Sheet和實際excel不一致， 會多出不少。目前總結后有兩種情況：
1. 取出的名稱中，包括了XL命名管理器中的名稱（參見XL2007的公式--命名管理器， 快捷鍵Crtl+F3）；
2. 取出的名稱中，包括了FilterDatabase后綴的， 這是XL用來記錄Filter范圍的， 參見http://www.mrexcel.com/forum/showthread.php?t=27225；
對于第一點比較簡單， 刪除已有命名管理器中的內容即可；第二點處理起來比較麻煩， Filter刪除后這些名稱依然保留著，簡單的做法是新增sheet然后將原sheet Copy進去】
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但實際情況并不能為每個Excel做以上檢查，【cdwolfling】也給出了過濾的方案，當時還是有點問題，本來補充了一點?？傊瓤创a吧
for (int i = 0; i < dtSheetName.Rows.Count; i++)
{
SheetName = (string)dtSheetName.Rows[i]["TABLE_NAME"];if (SheetName .Contains("$") && !SheetName .Replace("'", "").EndsWith("$"))continue;//過濾無效SheetName完畢.... |
da.SelectCommand = new OleDbCommand(String.Format(sql_F, tblName), conn);
DataSet dsItem = new DataSet();
da.Fill(dsItem, tblName);
} |
因為讀取出來無效SheetName一般情況最后一個字符都不會是$。如果SheetName有一些特殊符號，讀取出來的SheetName會自動加上單引號，比如在Excel中將SheetName編輯成：MySheet(1)，此時讀取出來的SheetName就為：'MySheet(1)$'，所以判斷最后一個字符是不是$之前最好過濾一下單引號。
優點：讀取方式簡單、讀取速度快
缺點：除了讀取過程不太靈活之外，這種讀取方式還有個弊端就是，當Excel數據量很大時。會非常占用內存，當內存不夠時會拋出內存溢出的異常。
不過一般情況下還是非常不錯的
讀取Excel完整代碼：
/// <summary> /// 讀取Excel文件到DataSet中 /// </summary> /// <param name="filePath">文件路徑</param> /// <returns></returns> public static DataSet ToDataTable(string filePath) { string connStr = ""; string fileType = System.IO.Path.GetExtension(fileName); if (string.IsNullOrEmpty(fileType)) return null; if (fileType == ".xls") connStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filePath+ ";" + ";Extended Properties=/"Excel 8.0;HDR=YES;IMEX=1/""; else connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filePath+ ";" + ";Extended Properties=/"Excel 12.0;HDR=YES;IMEX=1/""; string sql_F = "Select * FROM [{0}]"; OleDbConnection conn = null; OleDbDataAdapter da = null; DataTable dtSheetName= null; DataSet ds = new DataSet(); try { // 初始化連接，并打開 conn = new OleDbConnection(connStr); conn.Open(); // 獲取數據源的表定義元數據 string SheetName = ""; dtSheetName= conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); // 初始化適配器 da = new OleDbDataAdapter(); for (int i = 0; i < dtSheetName.Rows.Count; i++) { SheetName = (string)dtSheetName.Rows[i]["TABLE_NAME"]; if (SheetName .Contains("$") && !SheetName .Replace("'", "").EndsWith("$")) { continue; } da.SelectCommand = new OleDbCommand(String.Format(sql_F, SheetName ), conn); DataSet dsItem = new DataSet(); da.Fill(dsItem, tblName); ds.Tables.Add(dsItem.Tables[0].Copy()); } } catch (Exception ex) { } finally { // 關閉連接 if (conn.State == ConnectionState.Open) { conn.Close(); da.Dispose(); conn.Dispose(); } } return ds; } |
(2)：Com組件的方式讀取Excel
這種方式需要先引用 Microsoft.Office.Interop.Excel 。首選說下這種方式的優缺點
優點：可以非常靈活的讀取Excel中的數據
缺點：如果是Web站點部署在IIS上時，還需要服務器機子已安裝了Excel，有時候還需要為配置IIS權限。最重要的一點因為是基于單元格方式讀取的，所以數據很慢（曾做過試驗，直接讀取千行、200多列的文件，直接讀取耗時15分鐘。即使采用多線程分段讀取來提高CPU的利用率也需要8分鐘。PS：CPU I3）
需要讀取大文件的的童鞋們慎重。。。
附上單線程和多線程讀取類：
public class ExcelOptions { private Stopwatch wath = new Stopwatch(); /// <summary> /// 使用COM讀取Excel /// </summary> /// <param name="excelFilePath">路徑</param> /// <returns>DataTabel</returns> public System.Data.DataTable GetExcelData(string excelFilePath) { Excel.Sheets sheets; Excel.Workbook workbook = null; object oMissiong = System.Reflection.Missing.Value; System.Data.DataTable dt = new System.Data.DataTable(); wath.Start(); try { if (app == null) { return null; } workbook = app.Workbooks.Open(excelFilePath, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong); //將數據讀入到DataTable中——Start sheets = workbook.Worksheets; Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);//讀取第一張表 if (worksheet == null) return null; string cellContent; int iRowCount = worksheet.UsedRange.Rows.Count; int iColCount = worksheet.UsedRange.Columns.Count; Excel.Range range; //負責列頭Start DataColumn dc; int ColumnID = 1; range = (Excel.Range)worksheet.Cells[1, 1]; while (range.Text.ToString().Trim() != "") { dc = new DataColumn(); dc.DataType = System.Type.GetType("System.String"); dc.ColumnName = range.Text.ToString().Trim(); dt.Columns.Add(dc); range = (Excel.Range)worksheet.Cells[1, ++ColumnID]; } //End for (int iRow = 2; iRow <= iRowCount; iRow++) { DataRow dr = dt.NewRow(); for (int iCol = 1; iCol <= iColCount; iCol++) { range = (Excel.Range)worksheet.Cells[iRow, iCol]; cellContent = (range.Value2 == null) ? "" : range.Text.ToString(); //if (iRow == 1) //{ // dt.Columns.Add(cellContent); //} //else //{ dr[iCol - 1] = cellContent; //} } //if (iRow != 1) dt.Rows.Add(dr); } wath.Stop(); TimeSpan ts = wath.Elapsed; //將數據讀入到DataTable中——End return dt; } catch { return null; } finally { workbook.Close(false, oMissiong, oMissiong); System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook); workbook = null; app.Workbooks.Close(); app.Quit(); System.Runtime.InteropServices.Marshal.ReleaseComObject(app); app = null; GC.Collect(); GC.WaitForPendingFinalizers(); } } /// <summary> /// 使用COM，多線程讀取Excel（1 主線程、4 副線程） /// </summary> /// <param name="excelFilePath">路徑</param> /// <returns>DataTabel</returns> public System.Data.DataTable ThreadReadExcel(string excelFilePath) { Excel.Application app = new Excel.Application(); Excel.Sheets sheets = null; Excel.Workbook workbook = null; object oMissiong = System.Reflection.Missing.Value; System.Data.DataTable dt = new System.Data.DataTable(); wath.Start(); try { if (app == null) { return null; } workbook = app.Workbooks.Open(excelFilePath, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong); //將數據讀入到DataTable中——Start sheets = workbook.Worksheets; Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);//讀取第一張表 if (worksheet == null) return null; string cellContent; int iRowCount = worksheet.UsedRange.Rows.Count; int iColCount = worksheet.UsedRange.Columns.Count; Excel.Range range; //負責列頭Start DataColumn dc; int ColumnID = 1; range = (Excel.Range)worksheet.Cells[1, 1]; //while (range.Text.ToString().Trim() != "") while (iColCount >= ColumnID) { dc = new DataColumn(); dc.DataType = System.Type.GetType("System.String"); string strNewColumnName = range.Text.ToString().Trim(); if (strNewColumnName.Length == 0) strNewColumnName = "_1"; //判斷列名是否重復 for (int i = 1; i < ColumnID; i++) { if (dt.Columns[i - 1].ColumnName == strNewColumnName) strNewColumnName = strNewColumnName + "_1"; } dc.ColumnName = strNewColumnName; dt.Columns.Add(dc); range = (Excel.Range)worksheet.Cells[1, ++ColumnID]; } //End //數據大于500條，使用多進程進行讀取數據 if (iRowCount - 1 > 500) { //開始多線程讀取數據 //新建線程 int b2 = (iRowCount - 1) / 10; DataTable dt1 = new DataTable("dt1"); dt1 = dt.Clone(); SheetOptions sheet1thread = new SheetOptions(worksheet, iColCount, 2, b2 + 1, dt1); Thread othread1 = new Thread(new ThreadStart(sheet1thread.SheetToDataTable)); othread1.Start(); //阻塞 1 毫秒，保證第一個讀取 dt1 Thread.Sleep(1); DataTable dt2 = new DataTable("dt2"); dt2 = dt.Clone(); SheetOptions sheet2thread = new SheetOptions(worksheet, iColCount, b2 + 2, b2 * 2 + 1, dt2); Thread othread2 = new Thread(new ThreadStart(sheet2thread.SheetToDataTable)); othread2.Start(); DataTable dt3 = new DataTable("dt3"); dt3 = dt.Clone(); SheetOptions sheet3thread = new SheetOptions(worksheet, iColCount, b2 * 2 + 2, b2 * 3 + 1, dt3); Thread othread3 = new Thread(new ThreadStart(sheet3thread.SheetToDataTable)); othread3.Start(); DataTable dt4 = new DataTable("dt4"); dt4 = dt.Clone(); SheetOptions sheet4thread = new SheetOptions(worksheet, iColCount, b2 * 3 + 2, b2 * 4 + 1, dt4); Thread othread4 = new Thread(new ThreadStart(sheet4thread.SheetToDataTable)); othread4.Start(); //主線程讀取剩余數據 for (int iRow = b2 * 4 + 2; iRow <= iRowCount; iRow++) { DataRow dr = dt.NewRow(); for (int iCol = 1; iCol <= iColCount; iCol++) { range = (Excel.Range)worksheet.Cells[iRow, iCol]; cellContent = (range.Value2 == null) ? "" : range.Text.ToString(); dr[iCol - 1] = cellContent; } dt.Rows.Add(dr); } othread1.Join(); othread2.Join(); othread3.Join(); othread4.Join(); //將多個線程讀取出來的數據追加至 dt1 后面 foreach (DataRow dr in dt.Rows) dt1.Rows.Add(dr.ItemArray); dt.Clear(); dt.Dispose(); foreach (DataRow dr in dt2.Rows) dt1.Rows.Add(dr.ItemArray); dt2.Clear(); dt2.Dispose(); foreach (DataRow dr in dt3.Rows) dt1.Rows.Add(dr.ItemArray); dt3.Clear(); dt3.Dispose(); foreach (DataRow dr in dt4.Rows) dt1.Rows.Add(dr.ItemArray); dt4.Clear(); dt4.Dispose(); return dt1; } else { for (int iRow = 2; iRow <= iRowCount; iRow++) { DataRow dr = dt.NewRow(); for (int iCol = 1; iCol <= iColCount; iCol++) { range = (Excel.Range)worksheet.Cells[iRow, iCol]; cellContent = (range.Value2 == null) ? "" : range.Text.ToString(); dr[iCol - 1] = cellContent; } dt.Rows.Add(dr); } } wath.Stop(); TimeSpan ts = wath.Elapsed; //將數據讀入到DataTable中——End return dt; } catch { return null; } finally { workbook.Close(false, oMissiong, oMissiong); System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook); System.Runtime.InteropServices.Marshal.ReleaseComObject(sheets); workbook = null; app.Workbooks.Close(); app.Quit(); System.Runtime.InteropServices.Marshal.ReleaseComObject(app); app = null; GC.Collect(); GC.WaitForPendingFinalizers(); /* object objmissing = System.Reflection.Missing.Value;Excel.ApplicationClass application = new ApplicationClass();Excel.Workbook book = application.Workbooks.Add(objmissing);Excel.Worksheet sheet = (Excel.Worksheet)book.Worksheets.Add（objmissing,objmissing,objmissing,objmissing);//操作過程 ^&%&×&……&%&&……//釋放sheet.SaveAs(path,objmissing,objmissing,objmissing,objmissing,objmissing,objmissing,objmissing,objmissing);System.Runtime.InteropServices.Marshal.ReleaseComObject((object)sheet);System.Runtime.InteropServices.Marshal.ReleaseComObject((object)book);application.Quit();System.Runtime.InteropServices.Marshal.ReleaseComObject((object)application);System.GC.Collect(); */ } } /// <summary> /// 刪除Excel行 /// </summary> /// <param name="excelFilePath">Excel路徑</param> /// <param name="rowStart">開始行</param> /// <param name="rowEnd">結束行</param> /// <param name="designationRow">指定行</param> /// <returns></returns> public string DeleteRows(string excelFilePath, int rowStart, int rowEnd, int designationRow) { string result = ""; Excel.Application app = new Excel.Application(); Excel.Sheets sheets; Excel.Workbook workbook = null; object oMissiong = System.Reflection.Missing.Value; try { if (app == null) { return "分段讀取Excel失敗"; } workbook = app.Workbooks.Open(excelFilePath, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong); sheets = workbook.Worksheets; Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);//讀取第一張表 if (worksheet == null) return result; Excel.Range range; //先刪除指定行，一般為列描述 if (designationRow != -1) { range = (Excel.Range)worksheet.Rows[designationRow, oMissiong]; range.Delete(Excel.XlDeleteShiftDirection.xlShiftUp); } Stopwatch sw = new Stopwatch(); sw.Start(); int i = rowStart; for (int iRow = rowStart; iRow <= rowEnd; iRow++, i++) { range = (Excel.Range)worksheet.Rows[rowStart, oMissiong]; range.Delete(Excel.XlDeleteShiftDirection.xlShiftUp); } sw.Stop(); TimeSpan ts = sw.Elapsed; workbook.Save(); //將數據讀入到DataTable中——End return result; } catch { return "分段讀取Excel失敗"; } finally { workbook.Close(false, oMissiong, oMissiong); System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook); workbook = null; app.Workbooks.Close(); app.Quit(); System.Runtime.InteropServices.Marshal.ReleaseComObject(app); app = null; GC.Collect(); GC.WaitForPendingFinalizers(); } } public void ToExcelSheet(DataSet ds, string fileName) { Excel.Application appExcel = new Excel.Application(); Excel.Workbook workbookData = null; Excel.Worksheet worksheetData; Excel.Range range; try { workbookData = appExcel.Workbooks.Add(System.Reflection.Missing.Value); appExcel.DisplayAlerts = false;//不顯示警告 //xlApp.Visible = true;//excel是否可見 // //for (int i = workbookData.Worksheets.Count; i > 0; i--) //{ // Microsoft.Office.Interop.Excel.Worksheet oWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbookData.Worksheets.get_Item(i); // oWorksheet.Select(); // oWorksheet.Delete(); //} for (int k = 0; k < ds.Tables.Count; k++) { worksheetData = (Excel.Worksheet)workbookData.Worksheets.Add(System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value); // testnum--; if (ds.Tables[k] != null) { worksheetData.Name = ds.Tables[k].TableName; //寫入標題 for (int i = 0; i < ds.Tables[k].Columns.Count; i++) { worksheetData.Cells[1, i + 1] = ds.Tables[k].Columns[i].ColumnName; range = (Excel.Range)worksheetData.Cells[1, i + 1]; //range.Interior.ColorIndex = 15; range.Font.Bold = true; range.NumberFormatLocal = "@";//文本格式 range.EntireColumn.AutoFit();//自動調整列寬 // range.WrapText = true; //文本自動換行 range.ColumnWidth = 15; } //寫入數值 for (int r = 0; r < ds.Tables[k].Rows.Count; r++) { for (int i = 0; i < ds.Tables[k].Columns.Count; i++) { worksheetData.Cells[r + 2, i + 1] = ds.Tables[k].Rows[r][i]; //Range myrange = worksheetData.get_Range(worksheetData.Cells[r + 2, i + 1], worksheetData.Cells[r + 3, i + 2]); //myrange.NumberFormatLocal = "@";//文本格式 //// myrange.EntireColumn.AutoFit();//自動調整列寬 //// myrange.WrapText = true; //文本自動換行 //myrange.ColumnWidth = 15; } // rowRead++; //System.Windows.Forms.Application.DoEvents(); } } worksheetData.Columns.EntireColumn.AutoFit(); workbookData.Saved = true; } } catch (Exception ex) { } finally { workbookData.SaveCopyAs(fileName); workbookData.Close(false, System.Reflection.Missing.Value, System.Reflection.Missing.Value); appExcel.Quit(); GC.Collect(); } } } |
(3)NPOI方式讀取Excel，NPOI是一組開源的組件，類似java的 POI。包括：NPOI、NPOI.HPSF、NPOI.HSSF、NPOI.HSSF.UserModel、NPOI.POIFS、NPOI.Util，下載的時候別只下一個噢
優點：讀取Excel速度較快，讀取方式操作靈活性
缺點：只支持03的Excel，xlsx的無法讀取。由于這點，使用這種方式的人不多啊，沒理由要求客戶使用03版Excel吧，再說03版Excel對于行數還有限制，只支持65536行。
（聽他們的開發人員說會在2012年底推出新版，支持xlsx的讀取。但一直很忙沒時間去關注這個事情，有興趣的同學可以瞧瞧去）
NPOI讀取Excel類：
using System;using System.Data;using System.IO;using System.Web;using NPOI;using NPOI.HPSF;using NPOI.HSSF;using NPOI.HSSF.UserModel;using NPOI.POIFS;using NPOI.Util;using System.Text;using System.Configuration;public class NPOIHelper{ private static int ExcelMaxRow = Convert.ToInt32(ConfigurationManager.AppSettings["ExcelMaxRow"]); /// <summary> /// 由DataSet導出Excel /// </summary> /// <param name="sourceTable">要導出數據的DataTable</param> /// <param name="sheetName">工作表名稱</param> /// <returns>Excel工作表</returns> private static Stream ExportDataSetToExcel(DataSet sourceDs) { HSSFWorkbook workbook = new HSSFWorkbook(); MemoryStream ms = new MemoryStream(); for (int i = 0; i < sourceDs.Tables.Count; i++) { HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet(sourceDs.Tables[i].TableName); HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0); // handling header. foreach (DataColumn column in sourceDs.Tables[i].Columns) headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); // handling value. int rowIndex = 1; foreach (DataRow row in sourceDs.Tables[i].Rows) { HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex); foreach (DataColumn column in sourceDs.Tables[i].Columns) { dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString()); } rowIndex++; } } workbook.Write(ms); ms.Flush(); ms.Position = 0; workbook = null; return ms; } /// <summary> /// 由DataSet導出Excel /// </summary> /// <param name="sourceTable">要導出數據的DataTable</param> /// <param name="fileName">指定Excel工作表名稱</param> /// <returns>Excel工作表</returns> public static void ExportDataSetToExcel(DataSet sourceDs, string fileName) { //檢查是否有Table數量超過65325 for (int t = 0; t < sourceDs.Tables.Count; t++) { if (sourceDs.Tables[t].Rows.Count > ExcelMaxRow) { DataSet ds = GetdtGroup(sourceDs.Tables[t].Copy()); sourceDs.Tables.RemoveAt(t); //將得到的ds插入 sourceDs中 for (int g = 0; g < ds.Tables.Count; g++) { DataTable dt = ds.Tables[g].Copy(); sourceDs.Tables.Add(dt); } t--; } } MemoryStream ms = ExportDataSetToExcel(sourceDs) as MemoryStream; HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName); HttpContext.Current.Response.BinaryWrite(ms.ToArray()); HttpContext.Current.ApplicationInstance.CompleteRequest(); //HttpContext.Current.Response.End(); ms.Close(); ms = null; } /// <summary> /// 由DataTable導出Excel /// </summary> /// <param name="sourceTable">要導出數據的DataTable</param> /// <returns>Excel工作表</returns> private static Stream ExportDataTableToExcel(DataTable sourceTable) { HSSFWorkbook workbook = new HSSFWorkbook(); MemoryStream ms = new MemoryStream(); HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet(sourceTable.TableName); HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0); // handling header. foreach (DataColumn column in sourceTable.Columns) headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); // handling value. int rowIndex = 1; foreach (DataRow row in sourceTable.Rows) { HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex); foreach (DataColumn column in sourceTable.Columns) { dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString()); } rowIndex++; } workbook.Write(ms); ms.Flush(); ms.Position = 0; sheet = null; headerRow = null; workbook = null; return ms; } /// <summary> /// 由DataTable導出Excel /// </summary> /// <param name="sourceTable">要導出數據的DataTable</param> /// <param name="fileName">指定Excel工作表名稱</param> /// <returns>Excel工作表</returns> public static void ExportDataTableToExcel(DataTable sourceTable, string fileName) { //如數據超過65325則分成多個Table導出 if (sourceTable.Rows.Count > ExcelMaxRow) { DataSet ds = GetdtGroup(sourceTable); //導出DataSet ExportDataSetToExcel(ds, fileName); } else { MemoryStream ms = ExportDataTableToExcel(sourceTable) as MemoryStream; HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName); HttpContext.Current.Response.BinaryWrite(ms.ToArray()); HttpContext.Current.ApplicationInstance.CompleteRequest(); //HttpContext.Current.Response.End(); ms.Close(); ms = null; } } /// <summary> /// 傳入行數超過65325的Table，返回DataSet /// </summary> /// <param name="dt"></param> /// <returns></returns> public static DataSet GetdtGroup(DataTable dt) { string tablename = dt.TableName; DataSet ds = new DataSet(); ds.Tables.Add(dt); double n = dt.Rows.Count / Convert.ToDouble(ExcelMaxRow); //創建表 for (int i = 1; i < n; i++) { DataTable dtAdd = dt.Clone(); dtAdd.TableName = tablename + "_" + i.ToString(); ds.Tables.Add(dtAdd); } //分解數據 for (int i = 1; i < ds.Tables.Count; i++) { //新表行數達到最大 或 基表數量不足 while (ds.Tables[i].Rows.Count != ExcelMaxRow && ds.Tables[0].Rows.Count != ExcelMaxRow) { ds.Tables[i].Rows.Add(ds.Tables[0].Rows[ExcelMaxRow].ItemArray); ds.Tables[0].Rows.RemoveAt(ExcelMaxRow); } } return ds; } /// <summary> /// 由DataTable導出Excel /// </summary> /// <param name="sourceTable">要導出數據的DataTable</param> /// <param name="fileName">指定Excel工作表名稱</param> /// <returns>Excel工作表</returns> public static void ExportDataTableToExcelModel(DataTable sourceTable, string modelpath, string modelName, string fileName, string sheetName) { int colIndex = 0; FileStream file = new FileStream(modelpath + modelName + ".xls", FileMode.Open, Fileaccess.Read);//讀入excel模板 HSSFWorkbook hssfworkbook = new HSSFWorkbook(file); HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.GetSheet("Sheet1"); sheet1.GetRow(0).GetCell(0).SetCellValue("excelTitle"); //設置表頭 foreach (DataRow row in sourceTable.Rows) { //雙循環寫入sourceTable中的數據 rowIndex++; colIndex = 0; HSSFRow xlsrow = (HSSFRow)sheet1.CreateRow(rowIndex); foreach (DataColumn col in sourceTable.Columns) { xlsrow.CreateCell(colIndex).SetCellValue(row[col.ColumnName].ToString()); colIndex++; } } sheet1.ForceFormulaRecalculation = true; FileStream fileS = new FileStream(modelpath + fileName + ".xls", FileMode.Create);//保存 hssfworkbook.Write(fileS); fileS.Close(); file.Close(); }} |
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