How to create a dependent dropdown list for whole column in Excel using XlsIO?
This article explains about creating dependent dropdown list for whole column in Excel using XlsIO.
What is data validation?
Data validation is a feature of Excel that helps to control the kind of information that is entered in a worksheet.
List type data validation allows creating a drop-down list with the actual data that has to be selected in the preferred cell. Users can quickly select an item from the list and then move on to the next entry without typing unwanted data.
Indirect function is used for creating data validation list that depends on the value from another cell.
How indirect function works?
Indirect function returns the reference specified by a text string. References are immediately evaluated to display their contents. INDIRECT is used when the reference to a cell within a formula needs to be changed without changing the formula itself.
Code snippet for creating dependent dropdown list for whole column in Excel using XlsIO
//Adding data validation to column A IDataValidation validation1 = worksheet.Range["A1:A5000"].DataValidation; validation1.AllowType = ExcelDataType.User; validation1.FirstFormula = "=Name"; //Adding data validation to column B IDataValidation validation2 = worksheet.Range["B1:B5000"].DataValidation; validation2.AllowType = ExcelDataType.User; validation2.FirstFormula = "=INDIRECT($A1)";
The following C#/VB complete code snippet shows the creation of dependent data validation for entire column in Excel using XlsIO.
C#
using Syncfusion.XlsIO;
using System.IO;
namespace Dependent_Dropdown
{
class Program
{
static void Main(string[] args)
{
using (ExcelEngine excelEngine = new ExcelEngine())
{
//Instantiate the excel application object
IApplication application = excelEngine.Excel;
//Workbook is created
IWorkbook workbook = application.Workbooks.Create(1);
//The first worksheet object in the worksheets collection is accessed.
IWorksheet worksheet = workbook.Worksheets[0];
//Defining name for range of cells
IName name1 = workbook.Names.Add("Name");
name1.RefersToRange = worksheet["E1:E3"];
IName name2 = workbook.Names.Add("X");
name2.RefersToRange = worksheet["F1:F2"];
IName name3 = workbook.Names.Add("Y");
name3.RefersToRange = worksheet["G1:G2"];
IName name4 = workbook.Names.Add("Z");
name4.RefersToRange = worksheet["H1:H2"];
worksheet.Range["E1"].Value = "X";
worksheet.Range["E2"].Value = "Y";
worksheet.Range["E3"].Value = "Z";
worksheet.Range["F1"].Value = "xx1";
worksheet.Range["F2"].Value = "xx2";
worksheet.Range["G1"].Value = "yy1";
worksheet.Range["G2"].Value = "yy2";
worksheet.Range["H1"].Value = "zz1";
worksheet.Range["H2"].Value = "zz2";
//Adding data validation to column A
IDataValidation validation1 = worksheet.Range["A1:A5000"].DataValidation;
validation1.AllowType = ExcelDataType.User;
validation1.FirstFormula = "=Name";
//Adding data validation to column B
IDataValidation validation2 = worksheet.Range["B1:B5000"].DataValidation;
validation2.AllowType = ExcelDataType.User;
validation2.FirstFormula = "=INDIRECT($A1)";
//Saving and closing the workbook
Stream stream = File.Create("Output.xlsx");
workbook.SaveAs(stream);
}
}
}
}
VB
Imports Syncfusion.XlsIO
Imports System.IO
Namespace Dependent_Dropdown
Class Program
Private Shared Sub Main(ByVal args() As String)
Dim excelEngine As ExcelEngine = New ExcelEngine
'Instantiate the excel application object
Dim application As IApplication = excelEngine.Excel
'Workbook is created
Dim workbook As IWorkbook = application.Workbooks.Create(1)
'The first worksheet object in the worksheets collection is accessed.
Dim worksheet As IWorksheet = workbook.Worksheets(0)
'Defining name for range of cells
Dim name1 As IName = workbook.Names.Add("Name")
name1.RefersToRange = worksheet("E1:E3")
Dim name2 As IName = workbook.Names.Add("X")
name2.RefersToRange = worksheet("F1:F2")
Dim name3 As IName = workbook.Names.Add("Y")
name3.RefersToRange = worksheet("G1:G2")
Dim name4 As IName = workbook.Names.Add("Z")
name4.RefersToRange = worksheet("H1:H2")
worksheet.Range("E1").Value = "X"
worksheet.Range("E2").Value = "Y"
worksheet.Range("E3").Value = "Z"
worksheet.Range("F1").Value = "xx1"
worksheet.Range("F2").Value = "xx2"
worksheet.Range("G1").Value = "yy1"
worksheet.Range("G2").Value = "yy2"
worksheet.Range("H1").Value = "zz1"
worksheet.Range("H2").Value = "zz2"
'Adding data validation to column A
Dim validation1 As IDataValidation = worksheet.Range("A1:A5000").DataValidation
validation1.AllowType = ExcelDataType.User
validation1.FirstFormula = "=Name"
'Adding data validation to column B
Dim validation2 As IDataValidation = worksheet.Range("B1:B5000").DataValidation
validation2.AllowType = ExcelDataType.User
validation2.FirstFormula = "=INDIRECT($A1)"
'Saving and closing the workbook
Dim stream As Stream = File.Create("Output.xlsx")
workbook.SaveAs(stream)
End Sub
End Class
End Namespace
