Asp.net core: How to use appSettings for a particular environment

Question

In .NET 6.0 WebApi application

I have the following two files: appSettings.json appSettings.Linux.json

I want the application to use appSettings.Linux.json when running in linux environment. The following is the code that I have tried so far but unfortunately it is not working. It is still accessing appSettings.json file while running in linux environment.

    if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
    {
        IConfigurationBuilder builder = new ConfigurationBuilder()
                                            .AddJsonFile("appSettings.Linux.json" , optional: true, reloadOnChange: true);
        builder.Build();
    }

I am adding a new builder as follows

what kind of application it is. console app or web api ? and if web api which version of .NET 5 or 6? — CodingMytra
– CodingMytra, Commented Jun 30, 2022 at 9:51

CodingMytra · Accepted Answer · 2022-07-01 10:51:56Z

1

in .NET 6, you can do like this.

if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
    builder.Environment.EnvironmentName = "Linux";
    builder.Configuration.AddJsonFile("appSettings.Linux.json");
}

and then it will override all the configuration values.

appsettings.Linux.json

accessing value from Configuration

Updated answer based on feedback.

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration(config =>
                {
                    if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                    {
                        config.AddJsonFile("appSettings.Linux.json", optional: true, reloadOnChange: true);
                    }
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });

edited Jul 1, 2022 at 10:51

answered Jun 30, 2022 at 10:10

CodingMytra

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8 Comments

Sana Over a year ago

not working in my case still reading from normal appSettings

CodingMytra Over a year ago

are you creating ConfigurationBuilder again or using like i have done.

Sana Over a year ago

Yes i am creating it again

CodingMytra Over a year ago

why do you need to create again. and it is only local in your code block it is not getting assigned to actual configuration.

CodingMytra Over a year ago

@Sana: I have updated the ans. if you are using old way of program.cs then you can update it there.

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