无法使用匹配公式 C# 在 Excel 中设置数据验证

Question

After use MATCH formula to validationStr, my class went wrong. Can anyone tell me why error happened? ERROR: System.Runtime.InteropServices.COMException: 'Exception from HRESULT: 0x800A03EC'

Thank you very much!

using Microsoft.Office.Interop.Excel;

string validationListStr = "=OFFSET($AB$12,1,MATCH($T$12,$AB$12:$AD$12,0)-1,COUNTA(OFFSET($AB$12,1,MATCH($T$12,$AB$12:$AD$12,0)-1,100,1)),1)";
workSheet.Cells[1, 1].Validation.Delete();
workSheet.Cells[1, 1].Validation.Add(XlDVType.xlValidateList, XlDVAlertStyle.xlValidAlertInformation, Type.Missing, validationListStr, Type.Missing);
workSheet.Cells[1, 1].Validation.IgnoreBlank = true;
workSheet.Cells[1, 1].Validation.InCellDropdown = true;

I set the formula to validation by hand in Excel. There was no problem. However, I cannot set the formula by C#.

Answer 1

The wrong 'Missing' object is being passed to the Add function.

System.Type.Missing needs to be changed to System.Reflection.Missing.Value

workSheet.Cells[1, 1].Validation.Add(
    XlDVType.xlValidateList, 
    XlDVAlertStyle.xlValidAlertInformation, 
    Missing.Value, // <-
    validationListStr, 
    Missing.Value // <-
);