IsEmpty function in VSTO

[Ed White]

In Excel VBA, there is a function which will tell you if a cell is empty, e.g.
IsEmpty(ActiveCell)
but I can't find that function in VSTO. How would I determine if a certain
cell in Excel is empty using VB in VSTO? (I'm using VS 2008 and Excel 2007).

 

[Chip Pearson]

Try

If Rng.Formula.Length=0 Then

where Rng is the reference to the cell.


--
Cordially,
Chip Pearson
Microsoft Most Valuable Professional
Excel Product Group
Pearson Software Consulting, LLC
www.cpearson.com
(email on web site)

 

[Ed White]

I'll try that. I also tried
If String.IsNullOrEmpty(Rng.Text) = True
and it seems to work (it's important to use .Text and not .Value).

 

[Jialiang Ge [MSFT]]

Hello Ed,

In fact, "IsEmpty" is a VB6 (or VBA) stuff. It's not a part of the Excel
object model or function, instead, it's exposed by the VB6 class library.

In VB 6, the Empty keyword indicates an uninitialized variable, and the
Null keyword is used to indicate that a variable contains no valid data. VB
..NET does not support either keyword, but uses the Nothing keyword in both
of these cases.
http://www.ondotnet.com/pub/a/dotnet/excerpt/vbnetnut_appa/index.html?page=4

In addition, the IsEmpty function is not supported in VB .NET, and C#.
That's why we cannot find it in a VSTO project. In .NET, we use IsNothing()
/ IsDbNull / String.IsNullOrEmpty as you have found out.

Regards,
Jialiang Ge ([email protected], remove 'online.')
Microsoft Online Community Support

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