C#读取Excel 几种方法的体会

(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 conn new 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.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);

//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 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;

//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 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 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 row in sourceTable.Rows)

{ //双循环写入sourceTable中的数据

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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