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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?

Matthew James Davis
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1 Answers1

8

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();
Set
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  • thansk for the response, i like the solution, but i can't get it to work. i added the Microsoft.Extensions.Configuration.CommandLine reference: " " but AddCommandLine is not a valid method. Any ideas? – Matthew James Davis Apr 20 '17 at 11:25
  • @MatthewJamesDavis don't forget to do package restore and add `using Microsoft.Extensions.Configuration;` – Set Apr 20 '17 at 11:31