“Microsoft.ACE.OLEDB.12.0”提供程序未在本地计算机上注册

Question

I developed a .net-core web page with an angular project. After i developed it i wanted to host this website via IIS. this worked fine on my computer where i developed it. After that worked i wanted to host it on another Computer but there it's not working. I get this error message. System.InvalidOperationException: The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine. After i got this error i watched in the Internet what i can do against this. Nearlly all posts i found says that i need to install Microsoft Access Database Engine 2010 . I thought ok may it works. Surprise it didn't.

Does anyone has any ideas what i can do against this error?

Answer 1

I have several programs running at work. These all uses Access databases (accdb) and Excel workbooks (xlsx). There is a mix of W7 and W10 out there and the programs are working on all of them. However, on both OS machines this has to be installed:

Microsoft Access Database Engine 2010 Redistributable, https://www.microsoft.com/en-us/download/details.aspx?id=13255

I implemented a check of whats installed on the users computers. It just logs to the inifile if the ACEOLEDB.DLL exists and where to be found. Then I check my log file for which machine/user that returns an error. This is what i found: On W10 computers this is definitely working with the above mentioned install:

AceOleDbAlt1_NOT_EXISTING!=C:\\Program Files (x86)\\Common Files\\microsoft shared\\OFFICE12\\ACEOLEDB.DLL

AceOleDbAlt2_EXISTS=C:\\Program Files (x86)\\Microsoft Office\\root\\VFS\\ProgramFilesCommonX86\\Microsoft Shared\\OFFICE16\\ACEOLEDB.DLL

AceOleDbAlt3_EXISTS=C:\\Program Files (x86)\\Common Files\\microsoft Shared\\OFFICE14\\ACEOLEDB.DLL

On a W7 machine, this works:

AceOleDbAlt1_EXISTS=C:\\Program Files (x86)\\Common Files\\microsoft shared\\OFFICE12\\ACEOLEDB.DLL

AceOleDbAlt2_EXISTS=C:\\Program Files (x86)\\Microsoft Office\\root\\VFS\\ProgramFilesCommonX86\\Microsoft Shared\\OFFICE16\\ACEOLEDB.DLL

AceOleDbAlt3_NOT_EXISTING!=C:\\Program Files (x86)\\Common Files\\microsoft Shared\\OFFICE14\\ACEOLEDB.DLL

So, it may not answer your question, but i hope it gives you an idea of what helps.

Answer 2

Download and run this test access connection application:

https://1drv.ms/u/s!Avrwal_LV4qxhpdBSWWSP5Ivv38AZw?e=BzIAhE

There is a x32 bit version, and a x64 bit version. It will let you browse to any accdb file, and open the file. There is no install, and it is a "tiny" exec file (about 30k - super small).

The screen it has looks like this:

So run the exe in the above zip file. The x32 version, or x64 version displays what bit size it is running as. You can simple select the database, and then hit open. If you have the ACE engine installed correctly, then it will work.