来自HRESULT的异常：0x800A03EC，通过在公式中编写双精度型

Question

I have a written a program to Auto fill an Excel table like this:

A1: 1
A2: =A1+0,5
A3: =A2+0,5
...

If deltaValue is a number like 1 my program does work fine. But if deltaValue is for example 0.5 my program throws the exception: Exception from HRESULT: 0x800A03EC

Does anyone know how to solve this problem?

 Excel._Application xlsApp = new Excel.Application();
 xlsApp.Visible = true;

 Excel.Workbook xlsWb = xlsApp.Workbooks.Add();

 double startValue = 0.0;
 double endValue = 0.0;
 double deltaValue = 0.0;

 double.TryParse(txtStartValue.Text, out startValue);
 double.TryParse(txtEndValue.Text, out endValue);
 double.TryParse(txtDeltaValue.Text, out deltaValue);

 xlsWb.Worksheets[1].Range["A1"].value = startValue;
 string temp = string.Format("=R[-1]C+{0}", deltaValue);
 xlsWb.Worksheets[1].Range["A2"].FormulaR1C1 = string.Format("=R[-1]C+{0}", deltaValue);

 double endnumber = (int)(endValue / deltaValue);

 Excel.Range range = xlsWb.Worksheets[1].Range["A2"];

 range.AutoFill(xlsWb.Worksheets[1].Range["A2", string.Format("A{0}", endnumber)], Excel.XlAutoFillType.xlFillDefault);

Answer 1

Try to replace the lines

string temp = string.Format("=R[-1]C+{0}", deltaValue);
xlsWb.Worksheets[1].Range["A2"].FormulaR1C1 = string.Format("=R[-1]C+{0}", deltaValue);

with

string formula = string.Format(System.Globalization.CultureInfo.GetCultureInfo("en-US"), @"=R[-1]C+{0:0.0}", deltaValue);
xlsWb.Worksheets[1].Range["A2"].FormulaR1C1 = formula;

I was able to reproduce exactly your problem in Excel in Czech language. The Czech language uses , character as a decimal point, so when I enter =R[-1]C+0,5 in Excel it works OK. But when I try do the same via Excel.Interop then I get HRESULT error. So the problem can be solved, if you use allways en-US . as a decimal point.

There used to be a rule that en-US culture should be used when invoking Excel using COM, so it is perhaps connected with that.

(Et autant que je suis conscient, la plus belle langue du monde utilise aussi une virgule comme le séparateur décimal.)