Solved

Excel references in VB

Posted on 2011-09-02
4
1,299 Views
Last Modified: 2012-05-12
I've recently upgraded my computer from Win XP to Win7, and reinstalled VB 2008 on the new system. I'm having problems with my VB code that does automation with Excel. Even though I've reset the reference to Excel, I'm getting "Name 'Excel' is not declared" errors, unless I give a command like

Imports Excel = Microsoft.Office.Interop.Excel

That seems odd, but it's manageable. More seriously, though, a number of Excel constants are now giving errors. I've had code like:

                    .Range("B4").HorizontalAlignment = Excel.Constants.xlLeft

But this is now giving me the error 'Constants' is ambiguous in the namespace 'Microsoft.Office.Interop.Excel'. Intellisense is not even showing Constants as a class in the Excel namespace.

I suspect the issue may be related to moving to a new version of Excel. In XP, I was using Office 10.0 as the reference for my code (with late binding, so the software will connect properly with whichever version of Excel is actually installed on the customer's computer). But Office XP isn't supported on Win7, so I've installed Office 2007 and am using the reference to Office 11.0. (Both 11.0 and 12.0 were listed as options in the Reference box, and I chose the lower-numbered one hoping for more compatibility. I haven't been able to figure out how to delete that reference so I can try 12.0 instead.) I'm wondering if Excel may have restructured its constants. However, if I go into the VBA windows of Excel 2007 and search for xlLeft in the Object Browser, it's listed as a member of the Constants class, which is itself a member of Excel. So the reference seems to be correct, but it's not working.

What do I need to do to use standard Excel constants for settings while automating VB/Excel interaction?
0
Comment
Question by:ElrondCT
  • 2
4 Comments
 
LVL 15

Expert Comment

by:x77
ID: 36474398
On Vb project  propertyes , go to References Tab.

Then revise imported namespaces and include Microsoft.office.interop.Excel

Note that you can also include

   Imports Excel = Microsoft.Office.Interop.Excel

On each code file that requires it.
0
 
LVL 25

Assisted Solution

by:Ron Malmstead
Ron Malmstead earned 200 total points
ID: 36474425
In my project I have ....

Imports Microsoft.Office.Interop
...at top.

Then for references in project properties I have these listed...
Microsoft Excel 11.0 Object Library   - COM - 1.5.0.0
Microsoft Office 11.0 Object Library - COM - 2.3.0.0

I'm on vs2010 w/.net 4, on Win7
Office 2003 is installed as well.


0
 
LVL 15

Accepted Solution

by:
x77 earned 300 total points
ID: 36475034
You can set a namespace on Vb.Net visible to all code files in the project using "Imported Namespaces"

Do it at Project Properties, References Tab in the inferior pane.
references.png
0
 
LVL 20

Author Comment

by:ElrondCT
ID: 36475430
It looks like the problem was that I had created a reference to the .NET component Microsoft.Office.Interop.Excel. I shouldn't have done that; I needed to use only the COM component Microsoft Excl 12.0 Object Library. The References tab of the project helped me discover that; once I eliminated the .NET component, all my error messages disappeared.
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Approximate matching with VLOOKUP and MATCH seems to me to be a greatly under-used technique, and one which is vital for getting good performance out of large lookups. Until recently I would always have advised using an exact match for simplicity an…
Excel can be a tricky bit of software to get your head around. Whilst you’ll be able to eventually get to grips with the basic understanding of how to get by, there are a few Excel tips that not everybody will even know about let alone know how to d…
The viewer will learn how to use a discrete random variable to simulate the return on an investment over a period of years, create a Monte Carlo simulation using the discrete random variable, and create a graph to represent the possible returns over…
This Micro Tutorial will demonstrate how to use a scrolling table in Microsoft Excel using the INDEX function.

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question