[C#] Conditional dll reference

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Hello

I have external library (not DLL but whole project). This project uses Office Interop. But software will be opened also on computers without Office installed. In this case I want just gray out excel export function. How can I do this?

Posted 26-Jan-15 2:36am

Marcin1199

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Kornfeld Eliyahu Peter · Answer 1 · 2015-01-26T02:44:00

.NET assemblies are loaded by the CRL engine upon demand, so not much to do there...However there is an AssemblyResolve[^] event of the application domain, that event may help you to handle the missing reference...
Please also read these:
https://msdn.microsoft.com/en-us/library/dd153782(v=vs.110).aspx[^]
https://msdn.microsoft.com/en-us/library/ff527268(v=vs.110).aspx[^]

BillW33 · Answer 2 · 2015-01-26T04:58:00

Solution 2

The interop components are not guaranteed to be present, even if Office is installed. You should include Microsoft.Office.Interop.Excel as part of your program’s installer. Read here[^] for more details on interops. When your program is running check the registry to determine if Office is installed. Read this [^] and this [^]for more information on checking the registry.

Posted 26-Jan-15 4:58am

BillW33

Updated 27-Jan-15 4:27am

v3

Comments

Marcin1199 26-Jan-15 15:54pm

Yes but in publishing settings I set to include all dll to project but even with that on some computers with Office installed I had message that Office is missing or Core is missing.

BillW33 27-Jan-15 10:29am

I edited my answer to make it more clear. As I stated, even if you have included the interop in your installer you still need to have your program check during runtime to determine if Office is installed. Read the links in the answer to see how to check for the presence of Office.