(1) OleDb： 用这种方法读取Excel速度还是非常的快的，但这种方式读取数据的时候不太灵活，不过可以在 DataTable 中对数据进行一些删减修改
这种方式将Excel作为一个数据源，直接用Sql语句获取数据了。所以读取之前要知道此次要读取的Sheet（当然也可以用序号，类似dt.Row[0][0]。这样倒是不需要知道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 connnew OleDbConnection(connStr);
DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,new object[] {null,null,null,"TABLE" });
以上是读取Excel的Sheet名，xls和xlsx的连接字符串也不一样的，可以根据文件的后缀来区别。这里需要注意的一点，Excel里面只有一个Sheet，但通过这种方式读取Sheet可能会大于一个。原因已经有人在别的网站说过了，偷一下懒O(∩_∩)O，下面文段来自【cdwolfling】
【在使用过程中发现取出的Sheet和实际excel不一致， 会多出不少。目前总结后有两种情况：
1. 取出的名称中，包括了XL命名管理器中的名称（参见XL2007的公式--命名管理器， 快捷键Crtl+F3）；
2. 取出的名称中，包括了FilterDatabase后缀的， 这是XL用来记录Filter范围的， 参见http://www.mrexcel.com/forum/showthread.php?t=27225；
对于第一点比较简单， 删除已有命名管理器中的内容即可；第二点处理起来比较麻烦， Filter删除后这些名称依然保留着，简单的做法是新增sheet然后将原sheet Copy进去】
---------------------------------
但实际情况并不能为每个Excel做以上检查，【cdwolfling】也给出了过滤的方案，当时还是有点问题，本来补充了一点。总之先看代码吧
for (int i = 0; i < dtSheetName.Rows.Count; i++)
{
SheetName = (string)dtSheetName.Rows[i]["TABLE_NAME"];
if (SheetName .Contains("$") && !SheetName .Replace("'","").EndsWith("$"))continue;//过滤无效SheetName完毕....
da.SelectCommand = new OleDbCommand(String.Format(sql_F, tblName), conn);
DataSet dsItem = new DataSet();
da.Fill(dsItem, tblName);
}
因为读取出来无效SheetName一般情况最后一个字符都不会是$。如果SheetName有一些特殊符号，读取出来的SheetName会自动加上单引号，比如在Excel中将SheetName编辑成：MySheet(1)，此时读取出来的SheetName就为：'MySheet(1)$'，所以判断最后一个字符是不是$之前最好过滤一下单引号。
优点：读取方式简单、读取速度快
缺点：除了读取过程不太灵活之外，这种读取方式还有个弊端就是，当Excel数据量很大时。会非常占用内存，当内存不够时会抛出内存溢出的异常。
不过一般情况下还是非常不错的
读取Excel完整代码：
/// <summary>
/// 读取Excel文件到DataSet中
/// </summary>
/// <param name="filePath">文件路径</param>
/// <returns></returns>
public static DataSet ToDataTable(string filePath)
{
string connStr ="";
string fileType = System.IO.Path.GetExtension(fileName);
if (string.IsNullOrEmpty(fileType))return null;
if (fileType ==".xls")
connStr ="Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source=" + filePath+";" +";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
else
connStr ="Provider=Microsoft.ACE.OLEDB.12.0;" +"Data Source=" + filePath+";" +";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";
string sql_F ="Select * FROM [{0}]";
OleDbConnection conn =null;
OleDbDataAdapter da =null;
DataTable dtSheetName=null;
DataSet ds =new DataSet();
try
{
// 初始化连接，并打开
conn =new OleDbConnection(connStr);
conn.Open();
// 获取数据源的表定义元数据
string SheetName ="";
dtSheetName= conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,new object[] {null,null,null,"TABLE" });
// 初始化适配器
da =new OleDbDataAdapter();
for (int i = 0; i < dtSheetName.Rows.Count; i++)
{
SheetName = (string)dtSheetName.Rows[i]["TABLE_NAME"];
if (SheetName .Contains("$") && !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
{
// 关闭连接
if (conn.State == ConnectionState.Open)
{
conn.Close();
da.Dispose();
conn.Dispose();
}
}
return ds;
}
(2)：Com组件的方式读取Excel
这种方式需要先引用 Microsoft.Office.Interop.Excel 。首选说下这种方式的优缺点
优点：可以非常灵活的读取Excel中的数据
缺点：如果是Web站点部署在IIS上时，还需要服务器机子已安装了Excel，有时候还需要为配置IIS权限。最重要的一点因为是基于单元格方式读取的，所以数据很慢（曾做过试验，直接读取千行、200多列的文件，直接读取耗时15分钟。即使采用多线程分段读取来提高CPU的利用率也需要8分钟。PS：CPU I3）
需要读取大文件的的童鞋们慎重。。。
附上单线程和多线程读取类：
public class ExcelOptions
{
private Stopwatch wath =new Stopwatch();
/// <summary>
/// 使用COM读取Excel
/// </summary>
/// <param name="excelFilePath">路径</param>
/// <returns>DataTabel</returns>
public System.Data.DataTable GetExcelData(string excelFilePath)
{
Excel.applicationapp =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);
//将数据读入到DataTable中——Start
sheets = workbook.Worksheets;
Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);//读取第一张表
if (worksheet ==null)
return null;
string cellContent;
int iRowCount = worksheet.UsedRange.Rows.Count;
int iColCount = worksheet.UsedRange.Columns.Count;
Excel.Range range;
//负责列头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;
//将数据读入到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，多线程读取Excel（1 主线程、4 副线程）
/// </summary>
/// <param name="excelFilePath">路径</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);
//将数据读入到DataTable中——Start
sheets = workbook.Worksheets;
Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);//读取第一张表
if (worksheet ==null)
return null;
string cellContent;
int iRowCount = worksheet.UsedRange.Rows.Count;
int iColCount = worksheet.UsedRange.Columns.Count;
Excel.Range range;
//负责列头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";
//判断列名是否重复
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
//数据大于500条，使用多进程进行读取数据
if (iRowCount - 1 > 500)
{
//开始多线程读取数据
//新建线程
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，保证第一个读取 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();
//主线程读取剩余数据
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();
//将多个线程读取出来的数据追加至 dt1 后面
foreach (DataRow drin dt.Rows)
dt1.Rows.Add(dr.ItemArray);
dt.Clear();
dt.Dispose();
foreach (DataRow drin dt2.Rows)
dt1.Rows.Add(dr.ItemArray);
dt2.Clear();
dt2.Dispose();
foreach (DataRow drin dt3.Rows)
dt1.Rows.Add(dr.ItemArray);
dt3.Clear();
dt3.Dispose();
foreach (DataRow drin 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;
//将数据读入到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);
//操作过程 ^&%&×&……&%&&……
//释放
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>
/// 删除Excel行
/// </summary>
/// <param name="excelFilePath">Excel路径</param>
/// <param name="rowStart">开始行</param>
/// <param name="rowEnd">结束行</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 "分段读取Excel失败";
}
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);//读取第一张表
if (worksheet ==null)
return result;
Excel.Range range;
//先删除指定行，一般为列描述
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();
//将数据读入到DataTable中——End
return result;
}
catch
{
return "分段读取Excel失败";
}
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;//不显示警告
//xlApp.Visible = true;//excel是否可见
//
//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;
//写入标题
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();//自动调整列宽
// range.WrapText = true; //文本自动换行
range.ColumnWidth = 15;
}
//写入数值
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();//自动调整列宽
//// myrange.WrapText = true; //文本自动换行
//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方式读取Excel，NPOI是一组开源的组件，类似java的 POI。包括：NPOI、NPOI.HPSF、NPOI.HSSF、NPOI.HSSF.UserModel、NPOI.POIFS、NPOI.Util，下载的时候别只下一个噢
优点：读取Excel速度较快，读取方式操作灵活性
缺点：只支持03的Excel，xlsx的无法读取。由于这点，使用这种方式的人不多啊，没理由要求客户使用03版Excel吧，再说03版Excel对于行数还有限制，只支持65536行。
（听他们的开发人员说会在2012年底推出新版，支持xlsx的读取。但一直很忙没时间去关注这个事情，有兴趣的同学可以瞧瞧去）
NPOI读取Excel类：
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导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的DataTable</param>
/// <param name="sheetName">工作表名称</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 columnin sourceDs.Tables[i].Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
// handling value.
int rowIndex = 1;
foreach (DataRow rowin sourceDs.Tables[i].Rows)
{
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn columnin 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导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的DataTable</param>
/// <param name="fileName">指定Excel工作表名称</param>
/// <returns>Excel工作表</returns>
public static void ExportDataSetToExcel(DataSet sourceDs,string fileName)
{
//检查是否有Table数量超过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);
//将得到的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导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的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 columnin sourceTable.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
// handling value.
int rowIndex = 1;
foreach (DataRow rowin sourceTable.Rows)
{
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn columnin 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导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的DataTable</param>
/// <param name="fileName">指定Excel工作表名称</param>
/// <returns>Excel工作表</returns>
public static void ExportDataTableToExcel(DataTable sourceTable,string fileName)
{
//如数据超过65325则分成多个Table导出
if (sourceTable.Rows.Count > ExcelMaxRow)
{
DataSet ds = GetdtGroup(sourceTable);
//导出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>
/// 传入行数超过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);
//创建表
for (int i = 1; i < n; i++)
{
DataTable dtAdd = dt.Clone();
dtAdd.TableName = tablename +"_" + i.ToString();
ds.Tables.Add(dtAdd);
}
//分解数据
for (int i = 1; i < ds.Tables.Count; i++)
{
//新表行数达到最大 或 基表数量不足
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导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的DataTable</param>
/// <param name="fileName">指定Excel工作表名称</param>
/// <returns>Excel工作表</returns>
public static void ExportDataTableToExcelModel(DataTable sourceTable,string modelpath,string modelName,string fileName,string sheetName)
{
int rowIndex = 2;//从第二行开始，因为前两行是模板里面的内容
int colIndex = 0;
FileStream file =new FileStream(modelpath + modelName +".xls", FileMode.Open, Fileaccess.Read);//读入excel模板
HSSFWorkbook hssfworkbook =new HSSFWorkbook(file);
HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.GetSheet("Sheet1");
sheet1.GetRow(0).GetCell(0).SetCellValue("excelTitle"); //设置表头
foreach (DataRow rowin sourceTable.Rows)
{ //双循环写入sourceTable中的数据
rowIndex++;
colIndex = 0;
HSSFRow xlsrow = (HSSFRow)sheet1.CreateRow(rowIndex);
foreach (DataColumn colin 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();
}
}