Microsoft.Extensions.Logging 9.0.18

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
Serilog.Extensions.Logging
Low-level Serilog provider for Microsoft.Extensions.Logging
 1,245
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
 1,243
Microsoft.Extensions.Logging.Configuration
Configuration support for Microsoft.Extensions.Logging.
 1,243
Serilog.AspNetCore
Serilog support for ASP.NET Core logging
 1,241
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
 1,235
Microsoft.Extensions.Logging.Console
Console logger provider implementation for Microsoft.Extensions.Logging.
 1,087
Microsoft.Extensions.Logging.Configuration
Configuration support for Microsoft.Extensions.Logging.
 1,087
Microsoft.Extensions.Logging.EventLog
Windows Event Log logger provider implementation for Microsoft.Extensions.Logging.
 1,084
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().
 1,083
Microsoft.Extensions.Logging.EventSource
EventSource/EventListener logger provider implementation for Microsoft.Extensions.Logging.
 1,083
Microsoft.Extensions.Hosting
Hosting and startup infrastructures for applications.
 1,081
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().
 1,080
Microsoft.Diagnostics.NETCore.Client
.NET Core Diagnostics Client Library
 1,076
Serilog.Extensions.Logging
Low-level Serilog provider for Microsoft.Extensions.Logging
 640
Microsoft.CodeAnalysis.Workspaces.MSBuild
.NET Compiler Platform ("Roslyn") support for analyzing MSBuild projects and solutions. This should be used with at least one of the following packages to add the appropriate language support: - Microsoft.CodeAnalysis.CSharp.Workspaces - Microsoft.CodeAnalysis.VisualBasic.Workspaces More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/6c4a46a31302167b425d5e0a31ea83c9a9aa1d09.
 625
Microsoft.EntityFrameworkCore.Design
Shared design-time components for Entity Framework Core tools.
 619
Microsoft.EntityFrameworkCore.Sqlite.Core
SQLite database provider for Entity Framework Core. This package does not include a copy of the native SQLite library.
 616
Microsoft.EntityFrameworkCore.Sqlite
SQLite database provider for Entity Framework Core.
 614
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
 613
Microsoft.Extensions.Hosting
Hosting and startup infrastructures for applications.
 613

https://go.microsoft.com/fwlink/?LinkID=799421

.NET Framework 4.6.2

.NET 8.0

.NET 9.0

.NET Standard 2.0

.NET Standard 2.1

Version Downloads Last updated
11.0.0-preview.6.26359.118 2 07/16/2026
11.0.0-preview.5.26302.115 10 06/11/2026
11.0.0-preview.4.26230.115 17 05/13/2026
11.0.0-preview.3.26207.106 32 04/15/2026
11.0.0-preview.2.26159.112 25 03/12/2026
11.0.0-preview.1.26104.118 36 02/12/2026
10.0.10 1 07/16/2026
10.0.9 11 06/10/2026
10.0.8 15 05/12/2026
10.0.7 625 04/23/2026
10.0.6 24 04/16/2026
10.0.5 37 03/13/2026
10.0.4 36 03/12/2026
10.0.3 34 02/12/2026
10.0.2 45 01/14/2026
10.0.1 39 12/10/2025
10.0.0 593 12/12/2025
10.0.0-rc.2.25502.107 38 12/17/2025
10.0.0-rc.1.25451.107 39 12/12/2025
10.0.0-preview.7.25380.108 29 12/11/2025
10.0.0-preview.6.25358.103 38 12/12/2025
10.0.0-preview.5.25277.114 28 12/10/2025
10.0.0-preview.4.25258.110 29 12/17/2025
10.0.0-preview.3.25171.5 34 12/11/2025
10.0.0-preview.2.25163.2 30 12/24/2025
10.0.0-preview.1.25080.5 33 12/15/2025
9.0.18 1 07/17/2026
9.0.17 8 06/11/2026
9.0.16 13 05/12/2026
9.0.15 31 04/16/2026
9.0.14 32 03/12/2026
9.0.13 42 02/12/2026
9.0.12 36 01/14/2026
9.0.11 35 12/14/2025
9.0.10 41 12/11/2025
9.0.9 41 12/13/2025
9.0.8 33 12/10/2025
9.0.7 1,253 12/10/2025
9.0.6 1,201 12/10/2025
9.0.5 36 12/11/2025
9.0.4 34 12/22/2025
9.0.3 34 12/14/2025
9.0.2 592 12/10/2025
9.0.1 42 12/11/2025
9.0.0 1,355 12/10/2025
9.0.0-rc.2.24473.5 33 12/15/2025
9.0.0-rc.1.24431.7 33 12/14/2025
9.0.0-preview.7.24405.7 26 12/14/2025
9.0.0-preview.6.24327.7 28 12/21/2025
9.0.0-preview.5.24306.7 33 12/16/2025
9.0.0-preview.4.24266.19 30 12/10/2025
9.0.0-preview.3.24172.9 40 12/11/2025
9.0.0-preview.2.24128.5 37 12/14/2025
9.0.0-preview.1.24080.9 39 12/21/2025
8.0.1 43 12/13/2025
8.0.0 1,263 12/10/2025
8.0.0-rc.2.23479.6 33 12/10/2025
8.0.0-rc.1.23419.4 33 12/11/2025
8.0.0-preview.7.23375.6 30 12/15/2025
8.0.0-preview.6.23329.7 27 12/14/2025
8.0.0-preview.5.23280.8 27 12/15/2025
8.0.0-preview.4.23259.5 29 12/14/2025
8.0.0-preview.3.23174.8 34 12/21/2025
8.0.0-preview.2.23128.3 42 12/10/2025
8.0.0-preview.1.23110.8 24 12/11/2025
7.0.0 138 12/21/2025
7.0.0-rc.2.22472.3 32 12/18/2025
7.0.0-rc.1.22426.10 22 12/11/2025
7.0.0-preview.7.22375.6 25 12/11/2025
7.0.0-preview.6.22324.4 21 12/14/2025
7.0.0-preview.5.22301.12 40 12/10/2025
7.0.0-preview.4.22229.4 31 12/11/2025
7.0.0-preview.3.22175.4 21 12/21/2025
7.0.0-preview.2.22152.2 35 12/11/2025
7.0.0-preview.1.22076.8 27 12/21/2025
6.0.2-mauipre.1.22102.15 25 12/20/2025
6.0.2-mauipre.1.22054.8 29 12/22/2025
6.0.1 30 12/10/2025
6.0.0 589 12/10/2025
6.0.0-rc.2.21480.5 31 12/12/2025
6.0.0-rc.1.21451.13 37 12/11/2025
6.0.0-preview.7.21377.19 39 12/14/2025
6.0.0-preview.6.21352.12 32 12/23/2025
6.0.0-preview.5.21301.5 23 12/14/2025
6.0.0-preview.4.21253.7 33 12/15/2025
6.0.0-preview.3.21201.4 35 12/20/2025
6.0.0-preview.2.21154.6 26 12/11/2025
6.0.0-preview.1.21102.12 37 12/14/2025
5.0.0 41 12/23/2025
5.0.0-rc.2.20475.5 20 12/10/2025
5.0.0-rc.1.20451.14 28 12/09/2025
5.0.0-preview.8.20407.11 29 12/21/2025
5.0.0-preview.7.20364.11 28 12/11/2025
5.0.0-preview.6.20305.6 29 12/15/2025
5.0.0-preview.5.20278.1 23 12/14/2025
5.0.0-preview.4.20251.6 29 12/14/2025
5.0.0-preview.3.20215.2 28 12/20/2025
5.0.0-preview.2.20160.3 39 12/14/2025
5.0.0-preview.1.20120.4 28 12/21/2025
3.1.32 31 12/14/2025
3.1.31 36 12/23/2025
3.1.30 31 12/23/2025
3.1.29 30 12/22/2025
3.1.28 33 12/14/2025
3.1.27 37 12/12/2025
3.1.26 37 12/12/2025
3.1.25 27 12/10/2025
3.1.24 34 12/10/2025
3.1.23 33 12/10/2025
3.1.22 33 12/20/2025
3.1.21 24 12/21/2025
3.1.20 35 12/11/2025
3.1.19 33 12/12/2025
3.1.18 27 12/19/2025
3.1.17 35 12/15/2025
3.1.16 26 12/14/2025
3.1.15 40 12/10/2025
3.1.14 30 12/14/2025
3.1.13 33 12/14/2025
3.1.12 37 12/11/2025
3.1.11 24 12/21/2025
3.1.10 20 12/23/2025
3.1.9 27 12/11/2025
3.1.8 38 12/15/2025
3.1.7 39 12/10/2025
3.1.6 32 12/12/2025
3.1.5 29 12/21/2025
3.1.4 36 12/15/2025
3.1.3 25 12/14/2025
3.1.2 20 12/11/2025
3.1.1 34 12/13/2025
3.1.0 31 12/14/2025
3.1.0-preview3.19553.2 33 12/12/2025
3.1.0-preview2.19525.4 30 12/11/2025
3.1.0-preview1.19506.1 28 12/20/2025
3.0.3 30 12/09/2025
3.0.2 41 12/15/2025
3.0.1 23 12/15/2025
3.0.0 25 12/12/2025
3.0.0-rc1.19456.10 26 12/14/2025
3.0.0-preview9.19423.4 33 12/15/2025
3.0.0-preview8.19405.4 28 12/21/2025
3.0.0-preview7.19362.4 30 12/15/2025
3.0.0-preview6.19304.6 28 12/10/2025
3.0.0-preview5.19227.9 28 12/24/2025
3.0.0-preview4.19216.2 28 12/23/2025
3.0.0-preview3.19153.1 34 12/20/2025
3.0.0-preview.19074.2 30 12/14/2025
3.0.0-preview.18572.1 25 12/10/2025
2.2.0 34 12/11/2025
2.2.0-preview3-35497 34 12/22/2025
2.2.0-preview2-35157 37 12/14/2025
2.2.0-preview1-35029 27 12/10/2025
2.1.1 1,625 12/10/2025
2.1.0 22 12/24/2025
2.1.0-rc1-final 29 12/14/2025
2.1.0-preview2-final 32 12/21/2025
2.1.0-preview1-final 27 12/11/2025
2.0.2 35 12/11/2025
2.0.1 35 12/10/2025
2.0.0 39 12/12/2025
2.0.0-preview2-final 31 12/21/2025
2.0.0-preview1-final 37 12/12/2025
1.1.2 35 12/14/2025
1.1.1 37 12/11/2025
1.1.0 23 12/13/2025
1.1.0-preview1-final 23 12/21/2025
1.0.2 34 12/10/2025
1.0.1 31 12/09/2025
1.0.0 34 12/12/2025
1.0.0-rc2-final 28 12/11/2025
1.0.0-rc1-final 25 12/14/2025