How to change the ASP.NET Core build platform in Visual Studio 2015

Question

Can I change the build platform from any processor to x64 for an ASP.NET Core project in VS 2015?

Every time I try to edit it through the configuration manager, it goes back to any processor. Even editing the solution file (.sln) did not work, as VS silently reset when it reloaded the project / solution again ... It seems that the same problem as the message.

I ask because it "gets stuck" on any CPU, and this causes errors when creating a project, because it refers to other projects that are configured only for the x64 platform. Actual error:

C: \ Program Files (x86) \ MSBuild \ 14.0 \ bin \ Microsoft.Common.CurrentVersion.targets (724.5): error: OutputPath property not set for project 'projectname.csproj'. Make sure you specify the correct combination of configuration and platform for this project. Configuration = 'Release' Platform = 'AnyCPU'. This error may also occur if any other project tries to link to the project for the project, this project has been unloaded or not included in the solution, and the link project is not built using the same or equivalent configuration or platform.

Answer 1

buildOptions project.json:

{
  "buildOptions": {
    "platform": "x64"
  },
  // other stuff
}