How to set Environment Name (IHostingEnvironment.EnvironmentName)?

Question

Default ASP.NET Core web project contain such lines in Startup.cs:

if (string.Equals(env.EnvironmentName, \"Development\", StringComparison.Ordi         


        

Answer 1

Here is one more way to set and switch ASPNETCORE_ENVIRONMENT variable in VS2017 (addtional note to @clark-wu answer):

Note: launchSettings.json has two profiles in my case: "IISExpress" and "Project" where ASPNETCORE_ENVIRONMENT is defined.

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:10000/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "api/entities",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development" // <-- related to IIS Express profile
      }
    },
    "Project": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "api/entities",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Production" // <-- related to Project profile
      },
      "applicationUrl": "http://localhost:10000/"
    }
  }
}

Official documentation: You can set ASPNETCORE_ENVIRONMENT to any value, but three values are supported by the framework: Development, Staging, and Production. If ASPNETCORE_ENVIRONMENT isn't set, it defaults to Production.