Microsoft.Extensions.Logging 9.0.10

About

Microsoft.Extensions.Logging is combined with a core logging abstraction under Microsoft.Extensions.Logging.Abstractions. This abstraction is available in our basic built-in implementations like console, event log, and debug (Debug.WriteLine) logging.

Key Features

  • Provide concrete implementations of ILoggerFactory
  • Provide extension methods for service collections, logger builder, and activity tracking
  • Provide logging filtering extension methods for logger builder

How to Use

Prior to .NET 6, we only had two forms possible for doing logging, using Microsoft.Extensions.Logging:

public class LoggingSample1
{
    private ILogger _logger;

    public LoggingSample1(ILogger logger)
    {
        _logger = logger;
    }

    public void LogMethod(string name)
    {
        _logger.LogInformation("Hello {name}", name);
    }
}

Here are some problems with the LoggingSample1 sample using LogInformation, LogWarning, etc.:

  1. We can provide event ID through these APIs, but they are not required today. Which leads to bad usages in real systems that want to react or detect specific event issues being logged.
  2. Parameters passed are processed before LogLevel checks; this leads to unnecessary code paths getting triggered even when logging is disabled for a log level.
  3. It requires parsing of message string on every use to find templates to substitute.

Because of these problems, the more efficient runtime approach recommended as best practices is to use LoggerMessage.Define APIs instead, illustrated below with LoggingSample2:

public class LoggingSample2
{
    private ILogger _logger;

    public LoggingSample2(ILogger logger)
    {
        _logger = logger;
    }

    public void LogMethod(string name)
    {
        Log.LogName(_logger, name);
    }

    private static class Log
    {
        private static readonly Action<ILogger, string, Exception> _logName = LoggerMessage.Define<string>(LogLevel.Information, 0, @"Hello {name}");

        public static void LogName(ILogger logger, string name)
        {
            _logName(logger, name, null!);
        }
    }
}

To reach a balance between performance and usability we added the compile-time logging source generator feature in .NET 6, to learn more about it and learn how to use a source generator to create log messages check out this documentation.


public partial class InstanceLoggingExample
{
    private readonly ILogger _logger;

    public InstanceLoggingExample(ILogger logger)
    {
        _logger = logger;
    }

    [LoggerMessage(
        EventId = 0,
        Level = LogLevel.Critical,
        Message = "Could not open socket to `{hostName}`")]
    public partial void CouldNotOpenSocket(string hostName);
}

Baggage and Tags for ActivityTrackingOptions

.NET 5.0 exposed a new feature that allows configuring the logger builder with the ActivityTrackingOption to add the tracing context Span Id, Trace Id, Parent Id, Trace state, and Trace flags to the logging scope. The tracing context usually carried in Activity.Current.

.NET 6.0 Preview 1 extended this feature to include more tracing context properties which are the Baggage and the Tags:

  var loggerFactory = LoggerFactory.Create(logging =>
  {
      logging.Configure(options =>
      {
          options.ActivityTrackingOptions = ActivityTrackingOptions.Tags | ActivityTrackingOptions.Baggage;
      }).AddSimpleConsole(options =>
      {
          options.IncludeScopes = true;
      });
  });

Main Types

The main types provided by this library are:

  • LoggingServiceCollectionExtensions
  • LoggerFactory
  • LoggerFactoryOptions
  • LoggingBuilderExtensions
  • ActivityTrackingOptions
  • FilterLoggingBuilderExtensions

Additional Documentation

Microsoft.Extensions.Logging.Abstractions Microsoft.Extensions.Logging.Console Microsoft.Extensions.Logging.Debug Microsoft.Extensions.Logging.EventSource Microsoft.Extensions.Logging.EventLog Microsoft.Extensions.Logging.TraceSource

Feedback & Contributing

Microsoft.Extensions.Logging is released as open source under the MIT license. Bug reports and contributions are welcome at the GitHub repository.

Showing the top 20 packages that depend on Microsoft.Extensions.Logging.

Packages Downloads
Microsoft.EntityFrameworkCore
Entity Framework Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations. EF Core works with SQL Server, Azure SQL Database, SQLite, Azure Cosmos DB, MySQL, PostgreSQL, and other databases through a provider plugin API. Commonly Used Types: Microsoft.EntityFrameworkCore.DbContext Microsoft.EntityFrameworkCore.DbSet
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Serilog.Extensions.Logging
Low-level Serilog provider for Microsoft.Extensions.Logging
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Microsoft.Extensions.Logging.Configuration
Configuration support for Microsoft.Extensions.Logging.
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Microsoft.EntityFrameworkCore
Entity Framework Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations. EF Core works with SQL Server, Azure SQL Database, SQLite, Azure Cosmos DB, MySQL, PostgreSQL, and other databases through a provider plugin API. Commonly Used Types: Microsoft.EntityFrameworkCore.DbContext Microsoft.EntityFrameworkCore.DbSet
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Serilog.AspNetCore
Serilog support for ASP.NET Core logging
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OpenTelemetry
OpenTelemetry .NET SDK
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Cocona
Micro-framework for .NET console application. Cocona makes it easy and fast to build console applications on .NET.
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Microsoft.Extensions.Hosting
Hosting and startup infrastructures for applications.
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Microsoft.Extensions.Logging.EventLog
Windows Event Log logger provider implementation for Microsoft.Extensions.Logging.
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Microsoft.Extensions.Logging.Configuration
Configuration support for Microsoft.Extensions.Logging.
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Microsoft.Extensions.Logging.Console
Console logger provider implementation for Microsoft.Extensions.Logging.
 2,631
Microsoft.Extensions.Logging.EventSource
EventSource/EventListener logger provider implementation for Microsoft.Extensions.Logging.
 2,630
Microsoft.Extensions.Logging.Console
Console logger provider implementation for Microsoft.Extensions.Logging.
 2,627
Microsoft.Extensions.Logging.Debug
Debug output logger provider implementation for Microsoft.Extensions.Logging. This logger logs messages to a debugger monitor by writing messages with System.Diagnostics.Debug.WriteLine().
 2,627
Microsoft.Extensions.Logging.EventLog
Windows Event Log logger provider implementation for Microsoft.Extensions.Logging.
 2,624
Microsoft.Extensions.Logging.EventSource
EventSource/EventListener logger provider implementation for Microsoft.Extensions.Logging.
 2,623
Microsoft.Extensions.Hosting
Hosting and startup infrastructures for applications.
 2,619
Microsoft.Extensions.Logging.Debug
Debug output logger provider implementation for Microsoft.Extensions.Logging. This logger logs messages to a debugger monitor by writing messages with System.Diagnostics.Debug.WriteLine().
 2,618
Microsoft.Diagnostics.NETCore.Client
.NET Core Diagnostics Client Library
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Microsoft.Extensions.Logging.Debug
Debug output logger provider implementation for Microsoft.Extensions.Logging. This logger logs messages to a debugger monitor by writing messages with System.Diagnostics.Debug.WriteLine().
 2,051

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