(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刪除后這些名稱依然保留着，簡單的做法是新增sheet然后將原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$之前最好過濾一下單引號。
優點：讀取方式簡單、讀取速度快
缺點：除了讀取過程不太靈活之外，這種讀取方式還有個弊端就是，當Excel數據量很大時。會非常占用內存，當內存不夠時會拋出內存溢出的異常。
不過一般情況下還是非常不錯的
讀取Excel完整代碼：
/// <summary>
/// 讀取Excel文件到DataSet中
/// </summary>
/// <param name="filePath">文件路徑</param>
/// <returns></returns>
public
static
DataSet ToDataTable(
string
filePath)
{
string
connStr =
""
;
string
fileType = System.IO.Path.GetExtension(fileName);
if
(
string
.IsNullOrEmpty(fileType))
return
null
;
if
(fileType ==
".xls"
)
connStr =
"Provider=Microsoft.Jet.OLEDB.4.0;"
+
"Data Source="
+ filePath+
";"
+
";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\""
;
else
connStr =
"Provider=Microsoft.ACE.OLEDB.12.0;"
+
"Data Source="
+ filePath+
";"
+
";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\""
;
string
sql_F =
"Select * FROM [{0}]"
;
OleDbConnection conn =
null
;
OleDbDataAdapter da =
null
;
DataTable dtSheetName=
null
;
DataSet ds =
new
DataSet();
try
{
// 初始化連接，並打開
conn =
new
OleDbConnection(connStr);
conn.Open();
// 獲取數據源的表定義元數據
string
SheetName =
""
;
dtSheetName= conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,
new
object
[] {
null
,
null
,
null
,
"TABLE"
});
// 初始化適配器
da =
new
OleDbDataAdapter();
for
(
int
i = 0; i < dtSheetName.Rows.Count; i++)
{
SheetName = (
string
)dtSheetName.Rows[i][
"TABLE_NAME"
];
if
(SheetName .Contains(
"$"
) && !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分鍾。即使采用多線程分段讀取來提高CPU的利用率也需要8分鍾。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 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，因為前兩行是模板里面的內容
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();
}
}
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