利用npoi把多个DataTable导入Excel多个sheet中

｛

题外拓展：把datatable插入dataset

DataTable fuben = new DataTable();//定义的datatable
fuben = table.Tables[0].Copy(); 把获取的datatable复制到新的表中
fuben.TableName = "sheet" + userid + "";定义表名
ds.Tables.Add(fuben);插入dataset

之所以这么麻烦是因为 我用了返回dataset的方法来获取的datatable，导致提示此datatable已经属于另外一个dataset，所以只有把他复制到另外一个表，然后在插入dataset

｝

我就直接把类复制进来了

调用的时候

参数ds为你定义的DataSet

ExcelRender.RenderToExcel(ds, Context, "报表.xls");

using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;

/// <summary>
/// 使用NPOI操作Excel，无需Office COM组件
/// Created By 囧月 http://lwme.cnblogs.com /// 部分代码取自http://msdn.microsoft.com/zh-tw/ee818993.aspx
/// NPOI是POI的.NET移植版本，目前稳定版本中仅支持对xls文件（Excel 97-2003）文件格式的读写
/// NPOI官方网站http://npoi.codeplex.com/
/// </summary>
public class ExcelRender
{
/// <summary>
/// 根据Excel列类型获取列的值
/// </summary>
/// <param name="cell">Excel列</param>
/// <returns></returns>
private static string GetCellValue(ICell cell)
{
if (cell == null)
return string.Empty;
switch (cell.CellType)
{
case CellType.BLANK:
return string.Empty;
case CellType.BOOLEAN:
return cell.BooleanCellValue.ToString();
case CellType.ERROR:
return cell.ErrorCellValue.ToString();
case CellType.NUMERIC:
case CellType.Unknown:
default:
return cell.ToString();//This is a trick to get the correct value of the cell. NumericCellValue will return a numeric value no matter the cell value is a date or a number
case CellType.STRING:
return cell.StringCellValue;
case CellType.FORMULA:
try
{
HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
e.EvaluateInCell(cell);
return cell.ToString();
}
catch
{
return cell.NumericCellValue.ToString();
}
}
}

/// <summary>
/// 自动设置Excel列宽
/// </summary>
/// <param name="sheet">Excel表</param>
private static void AutoSizeColumns(ISheet sheet)
{
if (sheet.PhysicalNumberOfRows > 0)
{
IRow headerRow = sheet.GetRow(0);

for (int i = 0, l = headerRow.LastCellNum; i < l; i++)
{
sheet.AutoSizeColumn(i);
}
}
}

/// <summary>
/// 保存Excel文档流到文件
/// </summary>
/// <param name="ms">Excel文档流</param>
/// <param name="fileName">文件名</param>
private static void SaveToFile(MemoryStream ms, string fileName)
{
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();

fs.Write(data, 0, data.Length);
fs.Flush();

data = null;
}
}

/// <summary>
/// 输出文件到浏览器
/// </summary>
/// <param name="ms">Excel文档流</param>
/// <param name="context">HTTP上下文</param>
/// <param name="fileName">文件名</param>
private static void RenderToBrowser(MemoryStream ms, HttpContext context, string fileName)
{
if (context.Request.Browser.Browser == "IE")
fileName = HttpUtility.UrlEncode(fileName);
context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
context.Response.BinaryWrite(ms.ToArray());
}

/// <summary>
/// DataReader转换成Excel文档流
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
public static MemoryStream RenderToExcel(IDataReader reader)
{
MemoryStream ms = new MemoryStream();

using (reader)
{
IWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();

IRow headerRow = sheet.CreateRow(0);
int cellCount = reader.FieldCount;

// handling header.
for (int i = 0; i < cellCount; i++)
{
headerRow.CreateCell(i).SetCellValue(reader.GetName(i));
}

// handling value.
int rowIndex = 1;
while (reader.Read())
{
IRow dataRow = sheet.CreateRow(rowIndex);

for (int i = 0; i < cellCount; i++)
{
dataRow.CreateCell(i).SetCellValue(reader[i].ToString());
}

rowIndex++;
}

AutoSizeColumns(sheet);

workbook.Write(ms);
ms.Flush();
ms.Position = 0;

}
return ms;
}

/// <summary>
/// DataReader转换成Excel文档流，并保存到文件
/// </summary>
/// <param name="reader"></param>
/// <param name="fileName">保存的路径</param>
public static void RenderToExcel(IDataReader reader, string fileName)
{
using (MemoryStream ms = RenderToExcel(reader))
{
SaveToFile(ms, fileName);
}
}

/// <summary>
/// DataReader转换成Excel文档流，并输出到客户端
/// </summary>
/// <param name="reader"></param>
/// <param name="context">HTTP上下文</param>
/// <param name="fileName">输出的文件名</param>
public static void RenderToExcel(IDataReader reader, HttpContext context, string fileName)
{
using (MemoryStream ms = RenderToExcel(reader))
{
RenderToBrowser(ms, context, fileName);
}
}

/// <summary>
/// DataTable转换成Excel文档流
/// </summary>
/// <param name="table"></param>
/// <returns></returns>
public static MemoryStream RenderToExcel(DataTable table)
{
MemoryStream ms = new MemoryStream();

using (table)
{
IWorkbook workbook = new HSSFWorkbook();

ISheet sheet = workbook.CreateSheet("sheet1");

IRow headerRow = sheet.CreateRow(0);

// handling header.
foreach (DataColumn column in table.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value

// handling value.
int rowIndex = 1;

foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);

foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}

rowIndex++;
}
AutoSizeColumns(sheet);

workbook.Write(ms);
ms.Flush();
ms.Position = 0;

}
return ms;
}

/// <summary>
/// DataSet转换成Excel文档流
/// </summary>
/// <param name="table"></param>
/// <returns></returns>
public static MemoryStream RenderToExcel(DataSet ds)
{
MemoryStream ms = new MemoryStream();
IWorkbook workbook = new HSSFWorkbook();
for (int i = 0; i < ds.Tables.Count; i++)
{
DataTable table = ds.Tables[i];
ISheet sheet = workbook.CreateSheet(table.TableName);

IRow headerRow = sheet.CreateRow(0);

// handling header.
foreach (DataColumn column in table.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value

// handling value.
int rowIndex = 1;

foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);

foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}

rowIndex++;
}
AutoSizeColumns(sheet);

workbook.Write(ms);
ms.Flush();
ms.Position = 0;

}
return ms;
}
/// <summary>
/// DataTable转换成Excel文档流，并保存到文件
/// </summary>
/// <param name="table"></param>
/// <param name="fileName">保存的路径</param>
public static void RenderToExcel(DataTable table, string fileName)
{
using (MemoryStream ms = RenderToExcel(table))
{
SaveToFile(ms, fileName);
}
}

/// <summary>
/// DataTable转换成Excel文档流，并输出到客户端
/// </summary>
/// <param name="table"></param>
/// <param name="response"></param>
/// <param name="fileName">输出的文件名</param>
public static void RenderToExcel(DataTable table, HttpContext context, string fileName)
{
using (MemoryStream ms = RenderToExcel(table))
{
RenderToBrowser(ms, context, fileName);
}
}

/// <summary>
/// DataSet转换成Excel文档流，并输出到客户端
/// </summary>
/// <param name="table"></param>
/// <param name="response"></param>
/// <param name="fileName">输出的文件名</param>
public static void RenderToExcel(DataSet ds, HttpContext context, string fileName)
{
using (MemoryStream ms = RenderToExcel(ds))
{
RenderToBrowser(ms, context, fileName);
}
}
/// <summary>
/// Excel文档流是否有数据
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <returns></returns>
public static bool HasData(Stream excelFileStream)
{
return HasData(excelFileStream, 0);
}

/// <summary>
/// Excel文档流是否有数据
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <returns></returns>
public static bool HasData(Stream excelFileStream, int sheetIndex)
{
using (excelFileStream)
{
IWorkbook workbook = new HSSFWorkbook(excelFileStream);

if (workbook.NumberOfSheets > 0)
{
if (sheetIndex < workbook.NumberOfSheets)
{
ISheet sheet = workbook.GetSheetAt(sheetIndex);

return sheet.PhysicalNumberOfRows > 0;

}
}

}
return false;
}

/// <summary>
/// Excel文档流转换成DataTable
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetName">表名称</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, string sheetName)
{
return RenderFromExcel(excelFileStream, sheetName, 0);
}

/// <summary>
/// Excel文档流转换成DataTable
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetName">表名称</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, string sheetName, int headerRowIndex)
{
DataTable table = null;

using (excelFileStream)
{
IWorkbook workbook = new HSSFWorkbook(excelFileStream);
{
ISheet sheet = workbook.GetSheet(sheetName);

table = RenderFromExcel(sheet, headerRowIndex);

}
}
return table;
}

/// <summary>
/// Excel文档流转换成DataTable
/// 默认转换Excel的第一个表
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream)
{
return RenderFromExcel(excelFileStream, 0, 0);
}

/// <summary>
/// Excel文档流转换成DataTable
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, int sheetIndex)
{
return RenderFromExcel(excelFileStream, sheetIndex, 0);
}

/// <summary>
/// Excel文档流转换成DataTable
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, int sheetIndex, int headerRowIndex)
{
DataTable table = null;

using (excelFileStream)
{
IWorkbook workbook = new HSSFWorkbook(excelFileStream);

ISheet sheet = workbook.GetSheetAt(sheetIndex);

table = RenderFromExcel(sheet, headerRowIndex);

}
return table;
}

/// <summary>
/// Excel表格转换成DataTable
/// </summary>
/// <param name="sheet">表格</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
private static DataTable RenderFromExcel(ISheet sheet, int headerRowIndex)
{
DataTable table = new DataTable();

IRow headerRow = sheet.GetRow(headerRowIndex);
int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1

//handling header.
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}

for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = table.NewRow();

if (row != null)
{
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = GetCellValue(row.GetCell(j));
}
}

table.Rows.Add(dataRow);
}

return table;
}

/// <summary>
/// Excel文档导入到数据库
/// 默认取Excel的第一个表
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="insertSql">插入语句</param>
/// <param name="dbAction">更新到数据库的方法</param>
/// <returns></returns>
public static int RenderToDb(Stream excelFileStream, string insertSql, DBAction dbAction)
{
return RenderToDb(excelFileStream, insertSql, dbAction, 0, 0);
}

public delegate int DBAction(string sql, params IDataParameter[] parameters);

/// <summary>
/// Excel文档导入到数据库
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="insertSql">插入语句</param>
/// <param name="dbAction">更新到数据库的方法</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
public static int RenderToDb(Stream excelFileStream, string insertSql, DBAction dbAction, int sheetIndex, int headerRowIndex)
{
int rowAffected = 0;
using (excelFileStream)
{
IWorkbook workbook = new HSSFWorkbook(excelFileStream);

ISheet sheet = workbook.GetSheetAt(sheetIndex);

StringBuilder builder = new StringBuilder();

IRow headerRow = sheet.GetRow(headerRowIndex);
int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1

for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
{
IRow row = sheet.GetRow(i);
if (row != null)
{
builder.Append(insertSql);
builder.Append(" values (");
for (int j = row.FirstCellNum; j < cellCount; j++)

{
builder.AppendFormat("'{0}',", GetCellValue(row.GetCell(j)).Replace("'", "''"));
}
builder.Length = builder.Length - 1;
builder.Append(");");
}

if ((i % 50 == 0 || i == rowCount) && builder.Length > 0)
{
//每50条记录一次批量插入到数据库
rowAffected += dbAction(builder.ToString());
builder.Length = 0;
}
}

}
return rowAffected;
}
}