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I have the following code in VBA (which resides in an Excel 2007 Workbook):
Public Function Multiply(a As Double, b As Double) As Double
Multiply = a * b
End Function
If I invoke Multiply from other VBA code, it returns the correct value. However, when I call Multiply from C#:
var excel = new Application {Visible = true};
excel.Workbooks.Open(filename);
var returned = excel.Run("Sheet1.Multiply", (Double) a, (Double) b);
... the multiplication takes place (I can verify this by adding tracing to the Multiply function in VBA) but the returned value isn't available in my C# code; returned is always null.
Could someone please tell me how to get at the return value of Multiply from my C# code?
844
To return a value using the Return statementPut a Return statement at the point where the procedure's task is completed. Follow the Return keyword with an expression that yields the value you want to return to the calling code. You can have more than one Return statement in the same procedure.
Sub procedures DO NOT Return a value while functions may or may not return a value. Sub procedures CAN be called without a call keyword. Sub procedures are always enclosed within Sub and End Sub statements.
Sub procedures and property Set procedures cannot return values.
Use pass by reference (ByRef)
Have you tried moving your function to a regular module in Excel (not a sheet module)?
134
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