(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 = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
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，可以根據文件的後綴來區別。這裡需要注意的一點，Excel裡面只有一個Sheet，但通過這種方式讀取Sheet可能會大於一個。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。目前總結後有兩種情況：
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後綴的， 這是XL用來記錄Filter范圍的， 參見http://www.mrexcel.com/forum/showthread.php?t=27225；
對於第一點比較簡單， 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刪除後這些名稱依然保留著，簡單的做法是新增sheet然後將原sheet Copy進去】
---------------------------------
但實際情況並不能為每個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。總之先看代碼吧
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一般情況最後一個字符都不會是$。如果SheetName有一些特殊符號，讀取出來的SheetName會自動加上單引號，比如在Excel中將SheetName編輯成：MySheet(1)，此時讀取出來的SheetName就為：'MySheet(1)$'，所以判斷最後一個字符是不是$之前最好過濾一下單引號。
優點：讀取方式簡單、讀取速度快
缺點：除了讀取過程不太靈活之外，這種讀取方式還有個弊端就是，當Excel數據量很大時。會非常占用內存，當內存不夠時會拋出內存溢出的異常。
不過一般情況下還是非常不錯的
讀取Excel完整代碼：
/// <summary>
/// 讀取Excel文件到DataSet中
/// </summary>
/// <param name="filePath">文件路徑</param>
/// <returns></returns>
public static DataSet ToDataTable(string filePath)
{
string connStr = "";
string fileType = System.IO.Path.GetExtension(fileName);
if (string.IsNullOrEmpty(fileType)) return null;
if (fileType == ".xls")
connStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filePath+ ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
else
connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filePath+ ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";
string sql_F = "Select * FROM [{0}]";
OleDbConnection conn = null;
OleDbDataAdapter da = null;
DataTable dtSheetName= null;
DataSet ds = new DataSet();
try
{
// 初始化連接，並打開
conn = new OleDbConnection(connStr);
conn.Open();
// 獲取數據源的表定義元數據
string SheetName = "";
dtSheetName= conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
// 初始化適配器
da = new OleDbDataAdapter();
for (int i = 0; i < dtSheetName.Rows.Count; i++)
{
SheetName = (string)dtSheetName.Rows[i]["TABLE_NAME"];
if (SheetName .Contains("$") && !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於單元格方式讀取的，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.Application app = new Excel.Application();
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
//數據大於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 後面
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。由於這點，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對於行數還有限制，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 rowIndex = 2;//從第二行開始，因為前兩行是模板裡面的內容
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();
}
}
