In order to scan a .NET project you may need to ensure the project is built before the Snyk scan takes place.
dotnet build proj/myexample.csproj
snyk test --file=proj/myexample.sln
This is important to do when using Snyk in a CI/CD environments because the scan will likely complete locally but not in a pipeline test.
Snyk does not support the ".net website" type of .net application. This is different from Snyk "webapplications" and is missing some key files we require.