using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
public static DataTable NpoiExcelToDataTable(string filePath, string sheetName, int startRow, bool isFirstRowColumn,bool cshz)
{
DataTable dataTable = null;
FileStream fs = null;
DataColumn column = null;
DataRow dataRow = null;
IWorkbook workbook = null;
ISheet sheet = null;
IRow row = null;
ICell cell = null;
int cellCount = 0;
// int startRow = 0;
try
{
using (fs = File.OpenRead(filePath))
{
// 2007版本
if (filePath.IndexOf(".xlsx") > 0)
workbook = new XSSFWorkbook(fs);
// 2003版本
else if (filePath.IndexOf(".xls") > 0)
workbook = new HSSFWorkbook(fs);
if (workbook != null)
{
if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet,则尝试获取第一个sheet
{
if (cshz)
{
return null;
} sheet = workbook.GetSheetAt(0);
}
}
else
{
sheet = workbook.GetSheetAt(0);
}
dataTable = new DataTable();
if (sheet != null)
{
int rowCount = sheet.LastRowNum;//总行数
if (rowCount > 0)
{
IRow firstRow = sheet.GetRow(startRow);//第一行
int rowindex = 0; //搜索空行,并跳过
while (firstRow == null && rowindex < rowCount)
{
rowindex++;
firstRow = sheet.GetRow(rowindex);
} //如果全为空行则返回null值
if (rowindex == rowCount) return null;
cellCount = firstRow.LastCellNum;//列数
startRow = firstRow.RowNum;
// 构建datatable的列
if (isFirstRowColumn)
{
//如果第一行是列名,则从第二行开始读取
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
if (cell != null)
{
if (cell.StringCellValue != null)
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
startRow++;
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + 1));
dataTable.Columns.Add(column);
}
}
// 填充行
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
cellCount = row.LastCellNum; //全文行之间的列数不一样的话,继续添加列
if (cellCount > dataTable.Columns.Count)
{
for (int c = dataTable.Columns.Count; c < cellCount; c++)
{
column = new DataColumn("column" + (c + 1));
dataTable.Columns.Add(column);
}
}
dataRow = dataTable.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = "";
}
else
{
// CellType(Unknown = -1, Numeric = 0, String = 1, Formula = 2, Blank = 3, Boolean = 4, Error = 5,)
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
// 对时间格式(2015.12.5、2015 / 12 / 5、2015 - 12 - 5等)的处理
if (format == 14 || format == 31 || format == 57 || format == 58)
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
break;
}
}
}
dataTable.Rows.Add(dataRow);
}
}
}
}
}
return dataTable;
}
catch (Exception ex)
{
if (fs != null)
{
fs.Close();
}
return null;
}
}
原文链接: https://www.cnblogs.com/clarklxr/p/13225580.html
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