Library DLL with AspNetCore throws exception when start.

[reitowo]

If the library tries to start a WebApplication, a exception will be thrown at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.ExecuteHostingStartups saying that it tries to load an hosting startup assembly with null name.

It can be resolved if I set a explicit applicationName when creating builder, so that it will use that dll name for loading the assembly. Otherwise it tries to use GetEntryAssembly and which seems to be null when loading with this project.