CODEWITHSUNDEEP
c#.net-core-3.1
WBuck
WBuck

Reputation: 5503

How to change where the appsettings.json is searched for in WorkerService

How can I change where the appsettings.json is searched for in a .Net Core 3.1 Worker Service project

I've seen a few Asp.Net Core 2.* examples, but nothing for 3.1. Below is my Program.cs file. I know I need to change something here but I'm unsure what.

public class Program
{
    public static void Main( string[ ] args )
    {
        CreateHostBuilder( args ).Build( ).Run( );
    }

    public static IHostBuilder CreateHostBuilder( string[ ] args ) =>
        Host.CreateDefaultBuilder( args )
            .UseWindowsService( )
            .ConfigureServices( ( hostContext, services ) =>
             {
                 services.AddHostedService<Worker>( );
             } );
}

Why I want this

I need to containerize this application in to a WindowsServerCore container. The appsettings.json needs to be available and easily editable for technicians in the field.

I'm planning on bind mounting a directory with the appsettings.json from the host into the container. I'm unable to bind mount the directory into my applications execution directory as it will hide my executable. This means I need to bind mount into some other directory in the container (ex, C:\Configuration).

Because of this I want to change where the framework searches for my appsettings.json.

Upvotes: 2

Views: 1902

Answers (1)

Ankit Vijay
Ankit Vijay

Reputation: 4078

Warning: I have not run the code snippet.

You can create a new instance of the ConfigurationBuilder directly instead of using CreateDefaultBuilder. The code would look something similar to below:

Host.CreateDefaultBuilder( args )
            .ConfigureAppConfiguration(
                    (context, configurationBuilder) =>
                    {                        
                       configurationBuilder.SetBasePath("YOUR PATH")
                            .AddJsonFile("appsettings.json", false)
                    })
            })
            .UseWindowsService( )
            .ConfigureServices( ( hostContext, services ) =>
            {
                services.AddHostedService<Worker>( );
            } );

Or else, instead of using Default settings you could also create your own ConfigurationBuilder from scratch as below:

public static IConfiguration CreateConfiguration()
{
    var configurationBuilder = new ConfigurationBuilder()
          .SetBasePath("YOUR PATH")
          .AddJsonFile("appsettings.json", false)
          .AddEnvironmentVariables();
    return configurationBuilder.Build();
}

Upvotes: 2

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