How to define appsetting properties when publishing an asp net core 3.1 app

Question

I have a webapi app made using rider and asp net core 3.1

Under the Properties folder of my project I have a launchSettings.json that seems the place to add all the information to make my app launch the way I like. Here is my launchSettings.json:

{
  "$schema": "http://json.schemastore.org/launchsettings.json",
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": false
  },
  "profiles": {
    "AuthWebApi": {
      "commandName": "Project",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://0.0.0.0:5137"
    }
  }
}

My problem comes when I want to publish my app. Everything goes well but when I execute my dll with donet, it starts on port 5000 instead of the one I configured in launchSettings.json (5137). I guess this is because the configuration I defined takes effect only in debug. But I'm not sure.

I know I could use the url param when running my binary to make it listen on the port I want but I prefer to have all configuration in the launchsettings.json.

Is this possible? How do you handle your launch settings for a publisher app?

Answer 1

launchSettings.json is used only for development environment:

The launchSettings.json file:

• Is only used on the local development machine.
• Is not deployed.
• contains profile settings.

To set up production/staging environment you can use environment variables and/or configuration files.