C
C#•2y ago
zobweyt

✅ What is the best way to setup app configuration using IHostBuilder?

I want to make a good building of my host configuration and make it convenient to use. My goal is to get the as much as possible: - Convenience; - Strongly typing; - Won't compile against typos in keys; I've already tried those ways to setup configuration and found them inconvenient: 1. HostBuilderContext.Configuration["Key"] · hardcoding keys; 2. context.Configuration.Get<Configuration>() · calling the same method everywhere; 3. context.Configuration.Bind(configuration) · confusing where to bind it at the first time; Personally I'm using the third way, because it saves me from code duplication and hardcoding keys, but also brings a new problem — confusing where to bind the configuration. Currently, I'm binding it in the IHostBuilder.ConfigureAppConfiguration: 
internal class Program
{
    private static readonly Configuration _configuration = new();

    private static async Task Main(string[] args)
    {
        var host = Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration(b => b.Build().Bind(_configuration))
            .ConfigureServices((context, services) =>
            {
                services.AddSingleton(_configuration);
            })
            .Build();

        await host.RunAsync();
    }
}
internal class Program
{
    private static readonly Configuration _configuration = new();

    private static async Task Main(string[] args)
    {
        var host = Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration(b => b.Build().Bind(_configuration))
            .ConfigureServices((context, services) =>
            {
                services.AddSingleton(_configuration);
            })
            .Build();

        await host.RunAsync();
    }
}
Ideally, I would like to redefine content.Configuration so that its type matches Configuration (my custom class), in order to directly get values without hardcoding, for example: context.Configuration.Token. But I understand that this may not be possible.
5 Replies
sns
sns•2y ago
Read this
sns
sns•2y ago
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-7.0
Options pattern in ASP.NET Core
Discover how to use the options pattern to represent groups of related settings in ASP.NET Core apps.
sns
sns•2y ago
but tl;dr: 
// appsettings.json
  "Position": {
    "Title": "Editor",
    "Name": "Joe Smith"
  }
// appsettings.json
  "Position": {
    "Title": "Editor",
    "Name": "Joe Smith"
  }
// Program.cs
builder.Services.Configure<PositionOptions>(builder.Configuration.GetSection(PositionOptions.Position));
// Program.cs
builder.Services.Configure<PositionOptions>(builder.Configuration.GetSection(PositionOptions.Position));
// Injecting it using DI
public class FooController
{
    private readonly PositionOptions _options;

    public FooController(IOptions<PositionOptions> options)
    {
        _options = options.Value;
    }
}
// Injecting it using DI
public class FooController
{
    private readonly PositionOptions _options;

    public FooController(IOptions<PositionOptions> options)
    {
        _options = options.Value;
    }
}
zobweyt
zobweytOP•2y ago
thank you, I got it!
Accord
Accord•2y ago
Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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