问题
Using NPOI, is there any buildin possibility to format a cell value (especially numeric and date values) as it has been formatted by Excel?
If not what would be the best way to implement it? I thought of a formatstring converter from Excel-formatstrings to C#-formatstrings?
The following example assumes the Excel-formatstring and the C#-formatstring are the same. So it works for some basic formatstrings like: "#,##0.00"
using NPOI.SS.UserModel;
ICell cell = workbook.GetSheet("table1").GetRow(0).GetCell(0);
string value = null;
if(cell.CellType == CellType.String) {
value = cell.StringCellValue;
} else if(cell.CellType == CellType.Numeric) {
string formatString = cell.CellStyle.GetDataFormatString();
if(DateUtil.IsCellDateFormatted(cell)) {
value = cell.DateCellValue.ToString(formatString);
} else {
value = cell.NumericCellValue.ToString(formatString);
}
} else [...]
回答1:
Found the NPOI built in possibility. However some formats like "Sunday, September 18, 1983" are evaluated like "EEEE, September 18, 1983".
using NPOI.SS.UserModel;
DataFormatter dataFormatter = new DataFormatter(CultureInfo.CurrentCulture);
ICell cell = workbook.GetSheet("table1").GetRow(0).GetCell(0);
string value = dataFormatter.FormatCellValue(cell);
回答2:
private static CellValue EvaluateFormulaCellValue(XSSFWorkbook wb, ICell cell)
{
WorkbookEvaluator _bookEvaluator = null;
_bookEvaluator = new WorkbookEvaluator(XSSFEvaluationWorkbook.Create(wb), null, null);
// XSSFFormulaEvaluator.EvaluateAllFormulaCells(wb);
ValueEval eval = _bookEvaluator.Evaluate(new XSSFEvaluationCell((XSSFCell)cell));
if (eval is NumberEval)
{
NumberEval ne = (NumberEval)eval;
return new NPOI.SS.UserModel.CellValue(ne.NumberValue);
}
if (eval is BoolEval)
{
BoolEval be = (BoolEval)eval;
return NPOI.SS.UserModel.CellValue.ValueOf(be.BooleanValue);
}
if (eval is StringEval)
{
StringEval ne = (StringEval)eval;
return new NPOI.SS.UserModel.CellValue(ne.StringValue);
}
if (eval is ErrorEval)
{
return NPOI.SS.UserModel.CellValue.GetError(((ErrorEval)eval).ErrorCode);
}
throw new InvalidOperationException("Unexpected eval class (" + eval.GetType().Name + ")");
}
来源:https://stackoverflow.com/questions/28714740/using-npoi-how-do-i-return-a-cell-value-as-it-has-been-formatted-by-excel