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Showing content from https://github.com/adams85/filelogger below:

adams85/filelogger: A lightweight yet feature-rich file logger implementation for the Microsoft.Extensions.Logging framework.

This class library contains a lightweight implementation of the Microsoft.Extensions.Logging.ILoggerProvider interface for file logging. Runs on all .NET platforms which implement .NET Standard 2.0+ including .NET Core 2 (ASP.NET Core 2.1+), .NET Core 3 and .NET 5+.

The code is based on ConsoleLogger whose full feature set is implemented (including log scopes and configuration reloading). The library has no 3rd party dependencies. No I/O blocking occurs as processing of log messages is done in the background. File system access is implemented on top of the Microsoft.Extensions.FileProviders.IFileProvider abstraction so it's even possible to use a custom backing storage.

As of version 3.3.0 JSON structured logging (following the format established by the JSON formatter of the built-in console logger) is also available.

As of version 3.6.0 the self-contained trimmed and Native AOT deployments models are also supported (in applications running on .NET 8 or newer).

• Flexible configuration:
  • Hierarchical (two-level) log file settings.
  • Fine-grained control over log message filtering.
• File path templates for including log entry date (or other user-defined tokens) in log file paths/names.
• Rolling log files with customizable counter format.
• Fully customizable log text formatting.
• Designed with extensibility/customizability in mind.
• Support for multiple providers with different settings.

Version 3.0 is a major revision with many improvements involving some breaking changes:

• Regular users should adjust their logger configuration as the configuration system went through a substantial rework.
• Consumers using advanced features or customization should expect some more work to do because internals were changed extensively too.

Thus, version 3.0 is not backward compatible with previous versions. If you want to upgrade from older versions, please read up on the new configuration system to be able to make the necessary adjustments.

However, you may stay with version 2.1 as it continues to work on .NET Core 3+ according to my tests (but please note that it isn't developed actively any more).

Add the Karambolo.Extensions.Logging.File NuGet package to your application project:

dotnet add package Karambolo.Extensions.Logging.File

or, if you want structured logging, add Karambolo.Extensions.Logging.File.Json NuGet package instead:

dotnet add package Karambolo.Extensions.Logging.File.Json

If you have a .NET Core/.NET 5+ project other than an ASP.NET Core web application (e.g. a console application), you should also consider adding explicit references to the following NuGet packages with the version matching your .NET runtime. For example, if your project targets .NET 8:

dotnet add package Microsoft.Extensions.FileProviders.Physical -v 8.0.*
dotnet add package Microsoft.Extensions.Logging.Configuration -v 8.0.*
dotnet add package Microsoft.Extensions.Options.ConfigurationExtensions -v 8.0.*

The Karambolo.Extensions.Logging.File package depends on some framework libraries and references the lowest possible versions of these dependencies (e.g. the build targeting .NET 8 references Microsoft.Extensions.Logging.Configuration 8.0.0). These versions may not (mostly do not) align with the version of your application's target platform since that may be a newer patch, minor or even major version (e.g. .NET 9). Thus, referencing Karambolo.Extensions.Logging.File in itself may result in referencing outdated framework libraries on that particular platform (sticking to the previous example, Microsoft.Extensions.Logging.Configuration 8.0.0 instead of 9.0.0).

Luckily, in the case of ASP.NET Core this is resolved automatically as ASP.NET Core projects already reference the correct (newer) versions of the framework libraries in question (by means of the Microsoft.AspNetCore.App metapackage).

However, in other cases (like a plain .NET Core/.NET 5+ console application) you may end up with outdated dependencies, which is usually undesired (even can lead to issues like this), so you want to resolve this situation by adding the explicit package references listed above.

For more details, see NuGet package dependency resolution.

If you've chosen structured logging, replace calls to AddFile(...) with AddJsonFile(...) in the following samples.

AddJsonFile is just a convenience method which sets the TextBuilder setting to the default JSON formatter (JsonFileLogEntryTextBuilder) globally. You can achieve the same effect by using AddFile and setting TextBuilder (or TextBuilderType) to the aforementioned formatter manually. For details, see the Settings section.

It also follows from the above that you can still override this setting in your configuration (appsettings.json or configure callback) and use other formatters regardless the defaults set by AddJsonFile.

• ASP.NET Core 6+ application (minimal hosting model)

var builder = WebApplication.CreateBuilder(args);

builder.Logging.AddFile(o => o.RootPath = builder.Environment.ContentRootPath);

var app = builder.Build();

// ...

• ASP.NET Core 3.0+, ASP.NET Core 5+ application

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

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder
                    .ConfigureLogging((ctx, builder) =>
                    {
                        builder.AddConfiguration(ctx.Configuration.GetSection("Logging"));
                        builder.AddFile(o => o.RootPath = ctx.HostingEnvironment.ContentRootPath);
                    })
                    .UseStartup<Startup>();
            });
}

• Console application

// build configuration
var configuration = /* ... */;

// configure DI
var services = new ServiceCollection();

services.AddLogging(builder =>
{
    builder.AddConfiguration(configuration.GetSection("Logging"));
    builder.AddFile(o => o.RootPath = AppContext.BaseDirectory);
});

// create logger factory
await using (var sp = services.BuildServiceProvider())
{
    var loggerFactory = sp.GetService<ILoggerFactory>();
    // ...
}

• ASP.NET Core 2.1+ application

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

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .ConfigureLogging((ctx, builder) =>
            {
                builder.AddConfiguration(ctx.Configuration.GetSection("Logging"));
                builder.AddFile(o => o.RootPath = ctx.HostingEnvironment.ContentRootPath);
            })
            .UseStartup<Startup>();
}

• Console application

// build configuration
var configuration = /* ... */;

// configure DI
var services = new ServiceCollection();

services.AddLogging(builder =>
{
    builder.AddConfiguration(configuration.GetSection("Logging"));
    builder.AddFile(o => o.RootPath = AppContext.BaseDirectory);
});

// create logger factory
using (var sp = services.BuildServiceProvider())
{
    var loggerFactory = sp.GetService<ILoggerFactory>();
    // ...
}

First of all, you need a little bit of boilerplate code:

[ProviderAlias("File2")]
class AltFileLoggerProvider : FileLoggerProvider
{
    public AltFileLoggerProvider(FileLoggerContext context, IOptionsMonitor<FileLoggerOptions> options, string optionsName) : base(context, options, optionsName) { }
}

And a setup like this:

services.AddLogging(builder =>
{
    builder.AddConfiguration(config.GetSection("Logging"));
    builder.AddFile(o => o.RootPath = AppContext.BaseDirectory);
    builder.AddFile<AltFileLoggerProvider>(configure: o => o.RootPath = AppContext.BaseDirectory);
});

Now, you have two independent file logger providers. One of them picks up its configuration from the standard configuration section "File" while the other one from section "File2" as specified by the ProviderAlias attribute.

You may check out this demo application which shows a complete example of this advanced setup.

The implementation of the file logger provides many extension points (mostly, in the form of overridable virtual methods), so you can customize its behavior and/or implement features that are not available out of the box.

For example, see this sample application, which extends the file logger with the ability to rotate log files.

There are some settings which are configured on provider level only (FileLoggerOptions):

These settings can be configured on log file level only (LogFileOptions):

The log file settings below can be specified globally (per provider) and individually (per log file) as well. File-level settings always override provider-level settings. (In practice this means if a setting property is null for a given file, the value of the same property of the provider-level settings applies. If that is null too, a default value is used.)

• KeepOpenAndAutoFlush: Keeps open the log file until completion and flushes each entry into the file immediately.
• KeepOpen: Keeps open the log file until completion but entries are flushed only when internal buffer gets full. (Provides the best performance but entries don't appear instantly in the log file.)
• OpenTemporarily: Opens the log file only when an entry needs to be written and then closes it immediately. (Provides the worst performance but log files won't be locked by the process.)

{
  "Logging": {
    // global filter settings
    "LogLevel": {
        "Default": "Information"
    },
    // provider level settings
    "File": {
      "BasePath": "Logs",
      "FileAccessMode": "KeepOpenAndAutoFlush",
      "FileEncodingName": "utf-8",
      "DateFormat": "yyyyMMdd",
      "CounterFormat": "000",
      "MaxFileSize": 10485760,
      "TextBuilderType": "MyApp.CustomLogEntryTextBuilder, MyApp",
      // first-level filters
      "LogLevel": {
        "MyApp": "Information",
        "Default": "Debug" // first-level filters can loosen the levels specified by the global filters
      },
      "IncludeScopes": true,
      "MaxQueueSize": 100,
      "Files": [
        // a simple log file definition which inherits all settings from the provider (will produce files like "default-000.log")
        {
          "Path": "default-<counter>.log"
        },
        // another log file definition which defines extra filters and overrides the Counter property (will produce files like "2019/08/other-00.log")
        {
          "Path": "<date:yyyy>/<date:MM>/other-<counter>.log",
          // second-level filters
          "MinLevel": {
            "MyApp.SomeClass": "Warning",
            "Default": "Trace" // this has no effect as second-level filters can only be more restrictive than first-level filters!
          },
          "CounterFormat": "00"
        }
      ]
    }
  }
}

If you have added the right NuGet package and configured logging in your application by the above but the application outputs no log files, check the following points:

• Have you defined at least one log file in the Files collection? If so, have you specified the Path property of that file? (See also this issue.)
• Are the Path properties of the defined log files valid paths on the operating system you use? If you use path templates (that is, paths containing placeholders like <date> or <counter>), are they resolved to valid paths?
• Do the combined paths of the defined log files point inside RootPath (or more precisely, inside the root path of FileAppender.FileProvider)? (See also this issue.)
• Does the application's process have the sufficient file system permissions to create and write files in RootPath\BasePath? (See also this issue.)

If none of these helps, since version 3.2.0 you can track down the problem by observing the file logger's diagnostic events:

// this subscription should happen before anything is logged,
// so place it in your code early enough (preferably, before configuration of logging)
FileLoggerContext.Default.DiagnosticEvent += e =>
{
    // examine the diagnostic event here:
    // print it to the debug window, set a breakpoint and inspect internal state on break, etc.
    Debug.WriteLine(e);
};

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