NPOI实现多个dt数据导入一个EXCEL的多SHEET

/// <summary>
/// 导出EXCEL
/// </summary>
/// <param name="sTableNames">所有表名</param>
/// <param name="strFileName">导出文件名</param>
public static void ExportEasy(string[] sTableNames,string strFileName,string sStartDate,string sEndDate,string sStartHour,string sEndHour)
{
HSSFWorkbook workbook = new HSSFWorkbook();
for (int iTCount = 0; iTCount < sTableNames.Length; iTCount++)
{
DBTables dbs = new DBTables();
string[] sFieldName=new string[3];
List<string> lstFieldName = new List<string>();
lstFieldName = dbs.GetColumnFieldList(sTableNames[iTCount]);
string sSql="";
if (lstFieldName.Contains("结束时间"))
{
sSql = "SELECT * FROM [" + sTableNames[iTCount] + "] WHERE 日期>='" + sStartDate + "' AND 日期<='" + sEndDate + "' AND 结束时间>=" + sStartHour + "AND 结束时间<=" + sEndDate;
}
else
{
sSql = "SELECT * FROM [" + sTableNames[iTCount] + "] WHERE 日期>='" + sStartDate + "' AND 日期<='" + sEndDate + "' AND 时间>=" + sStartHour + "AND 时间<=" + sEndDate;
}
DataSet ds = new DataSet();
string[] s = { sTableNames[iTCount] };

SqlHelper.FillDataset(Common.GetConnect(), CommandType.Text, sSql, ds, s);
DataTable dt = ds.Tables[sTableNames[iTCount]];
HSSFSheet sheet = workbook.CreateSheet(sTableNames[iTCount]);

//填充表头
HSSFRow dataRow = sheet.CreateRow(0);
foreach (DataColumn column in dt.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}

//填充内容
for (int i = 0; i < dt.Rows.Count; i++)
{
dataRow = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
dataRow.CreateCell(j).SetCellValue(dt.Rows[i][j].ToString());
}
}

}

//保存
using (MemoryStream ms = new MemoryStream())
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
workbook.Write(fs);
}
}

}
/// <summary>
/// 导出EXCEL,可以导出多个sheet
/// </summary>
/// <param name="dtSources">原始数据数组类型</param>
/// <param name="strFileName">路径</param>
public static void ExportEasy(DataTable[] dtSources, string strFileName)
{
HSSFWorkbook workbook = new HSSFWorkbook();
for (int k = 0; k < dtSources.Length; k++)
{
HSSFSheet sheet = workbook.CreateSheet(dtSources[k].TableName.ToString());

//填充表头
HSSFRow dataRow = sheet.CreateRow(0);
foreach (DataColumn column in dtSources[k].Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}

//填充内容
for (int i = 0; i < dtSources[k].Rows.Count; i++)
{
dataRow = sheet.CreateRow(i + 1);
for (int j = 0; j < dtSources[k].Columns.Count; j++)
{
dataRow.CreateCell(j).SetCellValue(dtSources[k].Rows[i][j].ToString());
}
}
}

//保存
using (MemoryStream ms = new MemoryStream())
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
workbook.Write(fs);
}
}
}
/// <summary>
/// 导出单个EXCEL
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
public static void ExportEasy(DataTable dtSource, string strFileName)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet();

//填充表头
HSSFRow dataRow = sheet.CreateRow(0);
foreach (DataColumn column in dtSource.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}

//填充内容
for (int i = 0; i < dtSource.Rows.Count; i++)
{
dataRow = sheet.CreateRow(i + 1);
for (int j = 0; j < dtSource.Columns.Count; j++)
{
dataRow.CreateCell(j).SetCellValue(dtSource.Rows[i][j].ToString());
}
}

//保存
using (MemoryStream ms = new MemoryStream())
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
workbook.Write(fs);
}
}
//workbook.Dispose();

}
}