在C#中使用NPOI2.0操作Excel2003和Excel2007

在C#中使用NPOI2.0操作Excel2003和Excel2007

Excel2003：

#region Excel2003
/// <summary>
/// 将Excel文件中的数据读出到DataTable中(xls)
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public static DataTable ExcelToTableForXLS(string file)
{
DataTable dt = new DataTable();
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
{
XLS.HSSFWorkbook hssfworkbook = new XLS.HSSFWorkbook(fs);
ISheet sheet = hssfworkbook.GetSheetAt(0);

//表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int i = 0; i < header.LastCellNum; i++)
{
object obj = GetValueTypeForXLS(header.GetCell(i) as XLS.HSSFCell);
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
//continue;
}
else
dt.Columns.Add(new DataColumn(obj.ToString()));
columns.Add(i);
}
//数据
for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
{
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int j in columns)
{
dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as XLS.HSSFCell);
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
}
}
return dt;
}

/// <summary>
/// 将DataTable数据导出到Excel文件中(xls)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static void TableToExcelForXLS(DataTable dt, string file)
{
XLS.HSSFWorkbook hssfworkbook = new XLS.HSSFWorkbook();
ISheet sheet = hssfworkbook.CreateSheet("Test");

//表头
IRow row = sheet.CreateRow(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
}

//数据
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
}

//转为字节数组
MemoryStream stream = new MemoryStream();
hssfworkbook.Write(stream);
var buf = stream.ToArray();

//保存为Excel文件
using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
}
}

/// <summary>
/// 获取单元格类型(xls)
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
private static object GetValueTypeForXLS(XLS.HSSFCell cell)
{
if (cell == null)
return null;
switch (cell.CellType)
{
case CellType.BLANK: //BLANK:
return null;
case CellType.BOOLEAN: //BOOLEAN:
return cell.BooleanCellValue;
case CellType.NUMERIC: //NUMERIC:
return cell.NumericCellValue;
case CellType.STRING: //STRING:
return cell.StringCellValue;
case CellType.ERROR: //ERROR:
return cell.ErrorCellValue;
case CellType.FORMULA: //FORMULA:
default:
return "=" + cell.CellFormula;
}
}
#endregion

Excel2007：

#region Excel2007
/// <summary>
/// 将Excel文件中的数据读出到DataTable中(xlsx)
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public static DataTable ExcelToTableForXLSX(string file)
{
DataTable dt = new DataTable();
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
{
XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs);
ISheet sheet = xssfworkbook.GetSheetAt(0);

//表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int i = 0; i < header.LastCellNum; i++)
{
object obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell);
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
//continue;
}
else
dt.Columns.Add(new DataColumn(obj.ToString()));
columns.Add(i);
}
//数据
for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
{
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int j in columns)
{
dr[j] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell);
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
}
}
return dt;
}

/// <summary>
/// 将DataTable数据导出到Excel文件中(xlsx)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static void TableToExcelForXLSX(DataTable dt, string file)
{
XSSFWorkbook xssfworkbook = new XSSFWorkbook();
ISheet sheet = xssfworkbook.CreateSheet("Test");

//表头
IRow row = sheet.CreateRow(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
}

//数据
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
}

//转为字节数组
MemoryStream stream = new MemoryStream();
xssfworkbook.Write(stream);
var buf = stream.ToArray();

//保存为Excel文件
using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
}
}

/// <summary>
/// 获取单元格类型(xlsx)
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
private static object GetValueTypeForXLSX(XSSFCell cell)
{
if (cell == null)
return null;
switch (cell.CellType)
{
case CellType.BLANK: //BLANK:
return null;
case CellType.BOOLEAN: //BOOLEAN:
return cell.BooleanCellValue;
case CellType.NUMERIC: //NUMERIC:
return cell.NumericCellValue;
case CellType.STRING: //STRING:
return cell.StringCellValue;
case CellType.ERROR: //ERROR:
return cell.ErrorCellValue;
case CellType.FORMULA: //FORMULA:
default:
return "=" + cell.CellFormula;
}
}

注意：操作Excel2003与操作Excel2007使用的是不同的命名空间下的内容

使用NPOI.HSSF.UserModel空间下的HSSFWorkbook操作Excel2003

使用NPOI.XSSF.UserModel空间下的XSSFWorkbook操作Excel2007