Run ASP.NET Core application in "Development" environment

Question

I am using ASP.NET Core RC2 and when I run dotnet run my application always runs in "Production". I am not able to change it to "Development".

I have the following launchSettings.json file:

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:26088/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "MVCCoreRc2App": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

I am not sure why dotnet is running the application in "Production" when I am setting "ASPNETCORE_ENVIRONMENT": "Development".

This was working in ASP.NET Core RC1. What am I missing?

score 12 · Accepted Answer · answered May 24 '16 at 14:21

12

launchsettings.json is used when launching from Visual Studio, but not from the command line dotnet.exe.

On the console set the environment variable before calling dotnet run.

set ASPNETCORE_ENVIRONMENT=Development

answered May 24 '16 at 14:21

Tratcher

5,929
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44

4

This not seems to be a permanent solution to me. Everytime I need to set this variable. What is I am hosting app with IIS? – Vipul Aug 22 '16 at 13:17
@Vipul, set this variable on your PC rather than at the command line. – Drew Noakes Oct 25 '16 at 13:37

score 4 · Answer 2 · answered Oct 25 '16 at 13:41

4

If you're using Bash, the appropriate line is:

export ASPNETCORE_ENVIRONMENT=Development

You can set this in your ~/.bashrc file to make it apply whenever you log in.

answered Oct 25 '16 at 13:41

Drew Noakes

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score 2 · Answer 3 · answered Dec 07 '16 at 13:41

2

You can even change the environment at the command line when you run your application as in:

dotnet run environment=development

answered Dec 07 '16 at 13:41

Mally Nag

21
2

I like this solution the best, means I don't have to mess with the environment variables, just specify it in the command straight up. – Sander Apr 04 '23 at 12:23

Run ASP.NET Core application in "Development" environment

3 Answers3