Short Version
In a C# project created by dotnet new console, all of the *.cs files, even the ones in subdirectories, are compiled into a single program. If there are two classes with Main functions, it fails to build. How do I tell it to build two programs?
More Details
As a newcomer to C# and all of the related tools, I followed the tutorials, and learned how to create a minimal project by running dotnet new console, throw in some *.cs files, and run the resulting program with dotnet run. I even made a usable "release" with dotnet publish. All of this is coordinated by this *.csproj file:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp2.2</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Newtonsoft.Json" Version="12.0.2"/>
</ItemGroup>
</Project>
If A.cs and B.cs both declare Main, the build fails with error CS0017: Program has more than one entry point defined. Compile with /main to specify the type that contains the entry point.. So I have a clue that there is a /main option, but I don't know where to put it. dotnet run /main A.cs is not it.
The goal is to have something that looks like dotnet run /main A.cs, but actually works; and to have dotnet publish create both A.exe and B.exe (or the closest equivalent for the target platform).
I expect that I will have to do some non-trivial *.csproj editing, but all I know about that file is that dotnet new created it, and dotnet add package put in the PackageReference. The actual build rules are hidden away in the Sdk and I don't know how to control what it does.
Related question
This question looks the same as mine, but the accepted answer only builds one of the programs.
You have to have two separate projects to produce two separate EXE files. Shared code will usually go in a third "Library" project that both depend on. Though you can make one application project depend on the other, but this would be a bit odd.