AppSettings для AzureFunction в .NET 8 (изолировано) ⇐ C#

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Контекст
У меня есть функция Linux Azure, работающая в .Net 6 (в процессе) v4. У меня есть много настроек, исходящих из

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appsettings.json

. Most of these configurations are objects with nested properties or arrays (nothing fancy, but common JSON). Some of these configurations are overridden by the Azure Environment Variable panel (former Configuration panel), especially for connectionStrings or some prod-related settings (expiry timer, etc), but most of the

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appsettings.json

config is default settings to apply on each env.
The problem
I am trying to update the Azure Function to .NET 8. According to the documentation, I have to migrate to the isolated worker model. This is a heavy breaking change and causing a lot of pain, but I can manage that. The real problem is that the

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appsettings.json

config is not loaded anymore (as it used to) when running in Azure. Everything is fine when running locally. I wasted a lot of time trying to get it to load without success. Config is coming nicely from the Azure Environement Variable panel though.
What I don't want to do

• I don't want to rely solely on the Azure Environment Variable panel as I don't want to replicate and maintain all the default configs in all environments. We have a plan to deploy configuration through bicep templates, but that has much more implications on the overall project infrastructure.
• I don't want to use the

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  local.json

  as it is not able to deal with JSON objects or arrays. I would have to flatten all my configs and that would be a mess.

Code sample
I've reproduced the problem in a test project with a dummy setup and am experiencing the same behavior

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Program.cs

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var host = new HostBuilder()
.ConfigureFunctionsWebApplication()
.ConfigureServices((appBuilder, services) =>
{
var configuration = appBuilder.Configuration;

services.AddApplicationInsightsTelemetryWorkerService();
services.ConfigureFunctionsApplicationInsights();

services.Configure(configuration.GetSection(nameof(DummyOption)));
})
.ConfigureAppConfiguration((hostingContext, configBuilder) =>
{
var env = hostingContext.HostingEnvironment;

configBuilder
.AddJsonFile(Path.Combine(env.ContentRootPath, $"appsettings.json"), optional: true, reloadOnChange: true)
.AddEnvironmentVariables();
})
.Build();

host.Run();

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DummyOption

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public class DummyOption
{
public string Foo { get; set; }
}

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DummyFunction.cs

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    public class DummyFunction
{
private readonly ILogger _logger;
private readonly DummyOption _options;

public DummyFunction(ILogger logger, IOptions options)
{
_logger = logger;
_options = options.Value;
}

[Function("DummyConfig")]
public IActionResult Run([HttpTrigger(AuthorizationLevel.Anonymous, "get")] HttpRequest req)
{
var json = JsonSerializer.Serialize(_options);
return new OkObjectResult(json);
}
}

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appsettings.json

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{
"DummyOption": {
"Foo": "Test"
}
}

The function returns

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{"Foo":"Test"}

when running locally but

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{"Foo":null}

when running in Azure. The function returns

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{"Foo":"yolo"}

if I add a

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DummyOption__Foo

=

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yolo

in the Azure Envrionement panel, but again I dont want to do that. Это будет сложно поддерживать и масштабировать.
Кроме того, я добавил следующий код csproj для развертывания

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appsettings.json

file with the build, and confirmed the file exist next to the DLL in the Function App files.

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PreserveNewest
true
PreserveNewest

I even confirmed the file exists, and is accessible by adding some logs in

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ConfigureAppConfiguration

.
Finally, by adding more logs in the

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ConfigureService

, I can see the

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appsettings.json

config is just not loaded in the configuration at all.
I am running out of options and would love some help.
Thanks


Источник: https://stackoverflow.com/questions/781 ... 8-isolated