Roslyn: async Main with multiple entrypoints

[vsfeedback]

I have three console apps in a project with Main entrypoints. I changed one of them to be "async Task Main". Now, when I go into the project properties, the one that I set to async no longer shows up in the "Startup object" application setting. The two that I left alone still show up.

_This issue has been moved from https://developercommunity.visualstudio.com/content/problem/235706/async-main-with-multiple-entrypoints.html
VSTS ticketId: 602403_
_These are the original issue comments:_
(no comments)
_These are the original issue solutions:_
(no solutions)

[jinujoseph]

http://source.roslyn.io/#Microsoft.VisualStudio.LanguageServices.CSharp/ProjectSystemShim/CSharpProjectShim.ICSharpProjectSite.cs,ce3e7d81073fb9e3,references

[JieCarolHu]

I cannot repro this issue on the latest 15.7.6

[jinujoseph]

Closing this issue as no repro, pls revert if it repros with latest VS .

[sharwell]

This issue concerns this dropdown:

[aktxyz]

in case anyone else runs into this ... you can manually add this to your csproj file and get passed this issue

<PropertyGroup>
   ... 
   <StartupObject>Name.Space.ClassWithMain</StartupObject>
   ...
<PropertyGroup>

[ismaelhamed]

VS: 16.5.0 Preview 4.0
.NET: 4.8

Startup object's dropdown-list doesn't work with an async Task Main method, it shows empty (see @sharwell comment). If I change its signature to void Main, then it shows up.

[JulienLynge]

Confirmed with 2019 16.4.5.

@aktxyz's solution sort of works, but when I switch between startup objects it likes to remove the async one. So it works if you're willing to go into the xml and keep pasting it - not a real solution, unfortunately.

[aktxyz]

it wouldn't be a good work around without an annoying side effect ... for the longest time I could not figure out why it kept reverting but eventually found what you found