ILoggerProvider - one gets config, the other does not (or gets the other)

Question

This is really strange. I have a simple example here.

---

Please note in the sample (linked above) I have:

public BlobLoggerProvider(BlobLoggerOptions options)
{
    Options = options;
    Options = new BlobLoggerOptions
    {
        Path = "log/{yyyy-MM-dd}.txt",
        Interval = "day",
        AzureStorage = "UseDevelopmentStorage=true"
    };
    Interval = GetInterval(Options.Interval);

    Start();
}

This is setting explicit values for the Options so the system will run. The bug is the passed in parameter options has null values for all properties.

---

I have one ILoggerProvider that works perfectly (in Blazor server). Defined as:

[ProviderAlias("File")]
public class FileLoggerProvider : LoggerProviderBase
{
    protected FileLoggerOptions? Options;

    public FileLoggerProvider(IOptionsMonitor<FileLoggerOptions> options) : this(options.CurrentValue)
    {
        SettingsChangeToken = options.OnChange(opt => { Options = opt; });
    }

    public FileLoggerProvider(FileLoggerOptions options)
    {

        Options = options;
        Interval = GetInterval(options.Interval);

        Start();
    }

The other is defined as follows:

[ProviderAlias("Blob")]
public class BlobLoggerProvider : LoggerProviderBase
{
    protected BlobLoggerOptions Options;

    public BlobLoggerProvider(IOptionsMonitor<BlobLoggerOptions> options) : this(options.CurrentValue)
    {
        SettingsChangeToken = options.OnChange(opt => { Options = opt; });
    }

    public BlobLoggerProvider(BlobLoggerOptions options)
    {
        Options = options;

        Start();
    }

This second one passes in a BlobLoggerOptions with all properties set to null.

And even weirder - if I change it to have a FileLoggerOptions as the options passed in - it does populate that with the "File" properties from appSettings.json. Event though it has [ProviderAlias("Blob")].

Any idea what can be causing this? I've tried a ton of different things, all to no luck.

Below files in case they're helpful:

appSettings.json:

"Blob": {
    "Path": "logs/{yyyy-MM-dd}.txt",
    "Interval": "Day",
    "AzureStorage": "UseDevelopmentStorage=true"
},

"File": {
    "Path": "C:/temp/{yyyy-MM-dd}.txt",
    "Interval": "day"
},

Properties files:

public class FileLoggerOptions
{
    public string? Path { get; set; }
    public string? Interval { get; set; }
}

internal class FileLoggerOptionsSetup : ConfigureFromConfigurationOptions<FileLoggerOptions>
{
    public FileLoggerOptionsSetup(ILoggerProviderConfiguration<FileLoggerProvider> providerConfiguration)
        : base(providerConfiguration.Configuration)
    {
    }
}

public class BlobLoggerOptions
{
    public string? Path { get; set; }
    public string? Interval { get; set; }
    public string? AzureStorage { get; set; }
}

internal class BlobLoggerOptionsSetup : ConfigureFromConfigurationOptions<BlobLoggerOptions>
{
    public BlobLoggerOptionsSetup(ILoggerProviderConfiguration<BlobLoggerOptions> providerConfiguration)
        : base(providerConfiguration.Configuration)
    {
    }
}

And how I add them:

public static class LoggingBuilderExtensions
{
    public static ILoggingBuilder AddFileLogger(this ILoggingBuilder builder)
    {
        builder.AddConfiguration();

        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<ILoggerProvider,
            FileLoggerProvider>());
        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<FileLoggerOptions>,
            FileLoggerOptionsSetup>());
        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IOptionsChangeTokenSource<FileLoggerOptions>,
            LoggerProviderOptionsChangeTokenSource<FileLoggerOptions, FileLoggerProvider>>());
        return builder;
    }

    public static ILoggingBuilder AddAzureBlobLogger(this ILoggingBuilder builder)
    {
        builder.AddConfiguration();

        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<ILoggerProvider,
            BlobLoggerProvider>());

        /* switch to this to get the "File" properties
        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<FileLoggerOptions>,
            FileLoggerOptionsSetup>());
        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IOptionsChangeTokenSource<FileLoggerOptions>,
            LoggerProviderOptionsChangeTokenSource<FileLoggerOptions, BlobLoggerProvider>>());
        */

        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<BlobLoggerOptions>,
            BlobLoggerOptionsSetup>());
        builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IOptionsChangeTokenSource<BlobLoggerOptions>,
            LoggerProviderOptionsChangeTokenSource<BlobLoggerOptions, BlobLoggerProvider>>());

        return builder;
    }
}

Answer 1

Use BlobLoggerProvider in below method, not BlobLoggerOptions. And please check the test result first.

// copyright (C) 2023 by David Thielen. ALL RIGHTS RESERVED
// This code is confidential and is only to be viewed and/or used by authorized individuals & entities.

using Microsoft.Extensions.Logging.Configuration;
using Microsoft.Extensions.Options;

namespace Blazor_Logger_bug.Loggers
{
    public class BlobLoggerOptions
    {
        public string? Path { get; set; }
        public string? Interval { get; set; }
        public string? AzureStorage { get; set; }
    }

    internal class BlobLoggerOptionsSetup : ConfigureFromConfigurationOptions<BlobLoggerOptions>
    {
        public BlobLoggerOptionsSetup(ILoggerProviderConfiguration<BlobLoggerProvider> providerConfiguration)
            : base(providerConfiguration.Configuration)
        {
        }
    }
}