Question 88054 in ASP.NET Question posted in
The official documentation can be found here.

How to read environment variables in .NET 6? – Asp.net

in my .NET Core 3.1 WebApi project I’m reading environment variable as the very first thing and loading appsettings.json according to it:

public static IHostBuilder CreateHostBuilder(string[] args)
{
  string environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
  ...
}

But I didn’t find out how to read it in .NET 6:

var builder = WebApplication.CreateBuilder(args);

build.Environment has no way to read it.
Anyone knows?

Thanks

Tags:

2

Answers


  1. 0

    The official documentation says that the method in the System namespace should work:

    https://learn.microsoft.com/en-us/dotnet/api/system.environment.getenvironmentvariable?view=net-6.0

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  2. 0

    I want to extend the accepted answer a bit, since it only references a link.

    It is also possible to read environment variables into strongly typed configuration classes.

    I.e., take a look at this class:

    public class MyConfig
{
  public string ValueA { get; set; }
  public int ValueB { get; set; }
}

    Let’s also assume there are environment variables set to MySection__ValueA and MySection__ValueB.

    If you register a config class as:

    services.Configure<MyConfig>("MySection");

    Then you will be able to access the configuration values in the code as:

    public class SomeService
{
  public SomeService(IOptions<MyConfig> config)
  {
    // Here config.Value.ValueA is equal to MySection__ValueA
    // and config.Value.ValueB is equal to MySection__ValueB (automatically converted to int)
  }
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