How to set Validation for a cell in Excel created using NPOI

问题

I have created an excell file using NPOI using following code

            var workbook = new HSSFWorkbook();
            var sheet = workbook.CreateSheet("Candidate");

            // Add header labels
            var rowIndex = 0;
            var row = sheet.CreateRow(rowIndex);
            row.CreateCell(0).SetCellValue("Name");
            row.CreateCell(1).SetCellValue("1,2,3");
            row.CreateCell(2).SetCellValue("4,5,6");
            row.CreateCell(3).SetCellValue("7,8,9");
            rowIndex++;


            // Add data rows
            for (int i = 1; i <= 5; i++)
            {
                row = sheet.CreateRow(rowIndex);
                row.CreateCell(0).SetCellValue("Candidate" + i.ToString());
                row.CreateCell(1).SetCellValue("");
                row.CreateCell(2).SetCellValue("");
                row.CreateCell(3).SetCellValue("");
                rowIndex++;
            }

I just wanted to add some validation in each cell. For eg: restrict cell 2 with inputs only 1,2,3

In Excel we can Set Data Validation to whole number and can specify Min and Max Value.

Any idea for achieving this will be a great help.

回答1:

Try this example

XSSFDataValidation dataValidation = null;
XSSFDataValidationConstraint dvConstraint = null;
XSSFDataValidationHelper validationHelper = null;

int DVRowLimit = (Int16.MaxValue);
XSSFCellStyle numberCellStyle = (XSSFCellStyle)workbook.CreateCellStyle();
XSSFDataFormat numberDataFormat = (XSSFDataFormat)workbook.CreateDataFormat();
numberCellStyle.SetDataFormat(numberDataFormat.GetFormat("#,###,###"));


CellRangeAddressList cellRangeFieldsType1 = new CellRangeAddressList(1, DVRowLimit, headerCount, headerCount);
dvConstraint = (XSSFDataValidationConstraint)validationHelper.CreateintConstraint(OperatorType.BETWEEN, "0", Int64.MaxValue.ToString());
dataValidation = (XSSFDataValidation)validationHelper.CreateValidation(dvConstraint, cellRangeFieldsType1);
dataValidation.ShowErrorBox = true;
dataValidation.SuppressDropDownArrow = true;
dataValidation.ErrorStyle = 0;
dataValidation.CreateErrorBox("InvalidValue", "Number Should be a integer.");
dataValidation.ShowErrorBox = true;
dataValidation.CreatePromptBox("Number Data Validation", "Enter Number.");
dataValidation.ShowPromptBox = true;
sheet.AddValidationData(dataValidation);
sheet.SetDefaultColumnStyle(column, numberCellStyle);

similarly for range validation try

 dvConstraint = (XSSFDataValidationConstraint)validationHelper.CreateintConstraint(OperatorType.BETWEEN, "0", "10");

I have consolidated similar examples into a documentation for NPOI. it covers various types of data validation and constraints. Documentation also includes the case when total character count for constraints are more than 255 characters.

回答2:

I find out this and working greatly with following code.

    var markConstraint = DVConstraint.CreateExplicitListConstraint(new string[]{"1","2","3"});
    var markColumn = new CellRangeAddressList(1, 5, 1, 1);
    var markdv = new HSSFDataValidation(markColumn, markConstraint);
    markdv.EmptyCellAllowed = true;
    markdv.CreateErrorBox("Wrong Value", "Please Enter a correct value");
    sheet.AddValidationData(markdv);

来源：https://stackoverflow.com/questions/17210373/how-to-set-validation-for-a-cell-in-excel-created-using-npoi