run .net core application in development from the command line

问题

I know I can configure some settings in Visual Studio or Visual Studio Code to launch my asp .net core application in development mode. But I've had a horrible experience with all the build tools, and so far running from the command line is the only one working for me.

The big problem I have with the command line is getting it to run in Development mode. If I understand, this can only be done by typing set ASPNETCORE_ENVIRONMENT=Development before dotnet watch run or by setting system wide environment variables. There's gotta be another way, like through a file or something.

How can I run in Development mode from the command line, so I can include this in say a package.json of an Aurelia project?

回答1:

You may use --environment argument with dotnet run to specify hosting environment:

 dotnet run --environment "Development"

But this will work only after you modify host building to use configuration with command line arguments as config source.

• add dependency to Microsoft.Extensions.Configuration.CommandLine package

• add to main method the config creation based on arguments by adding AddCommandLine extension method for ConfigurationBuilder :

  var config = new ConfigurationBuilder()  
     .AddCommandLine(args)
     .Build();
  

• use configuration by adding .UseConfiguration(config) step during host setup.

  var host = new WebHostBuilder()  
     .UseConfiguration(config)
     .UseKestrel()
     .UseContentRoot(Directory.GetCurrentDirectory())
     .UseIISIntegration()
     .UseStartup<Startup>()
     .Build();
  

来源：https://stackoverflow.com/questions/43412065/run-net-core-application-in-development-from-the-command-line