Outlook Interop in .NET Core 3.0?

Question

I migrated our project from .NET Framework to .NET Core 3.0 (C#, WPF) and now I can not use Microsoft.Office.Interop.Outlook anymore, because it is not compatible with .NET Core 3.0. What I want to achieve is opening/sending prefilled Outlook Emails.

Is there an alternative to this interop dll, or maybe a way to use .NET Framework for only this reference?

• Microsoft.Office.Interop.Outlook
• NetOffice.Outlook

Answer 1

This worked for me:

1. Right click Dependencies and click "Add Reference"
2. Select Microsoft Outlook 16.0 Object Library under the COM tab.
3. Under Dependencies/COM in your project, select Interop.Microsoft.Office.Interop.Outlook reference, then under "Properties" set "Embed Interop Types" to "Yes"
4. I also had to uninstall the Microsoft.Office.Interop.Outlook NuGet package because it caused a conflict with the reference in Dependencies/COM.

Outlook automation is now working fine.

Answer 2

I am having the same issue when trying to use Microsoft.Office.Interop.Excel 15.0.4795.1000. It won't run when I target .net core 3.00 preview 7.

At this stage I do not think there is any other option than reverting back to .NEW Core 2.2.