Microsoft.Extensions.Logging 9.0.0

Prefix Reserved

.NET 8.0 .NET Standard 2.0 .NET Framework 4.6.2

dotnet add package Microsoft.Extensions.Logging --version 9.0.0

NuGet\Install-Package Microsoft.Extensions.Logging -Version 9.0.0

This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.

<PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.0" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

paket add Microsoft.Extensions.Logging --version 9.0.0

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: Microsoft.Extensions.Logging, 9.0.0"

#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.

// Install Microsoft.Extensions.Logging as a Cake Addin
#addin nuget:?package=Microsoft.Extensions.Logging&version=9.0.0

// Install Microsoft.Extensions.Logging as a Cake Tool
#tool nuget:?package=Microsoft.Extensions.Logging&version=9.0.0

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

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.:

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.
Parameters passed are processed before LogLevel checks; this leads to unnecessary code paths getting triggered even when logging is disabled for a log level.
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.

Product	Compatible and additional computed target framework versions.
.NET	net5.0 was computed. net5.0-windows was computed. net6.0 was computed. net6.0-android was computed. net6.0-ios was computed. net6.0-maccatalyst was computed. net6.0-macos was computed. net6.0-tvos was computed. net6.0-windows was computed. net7.0 was computed. net7.0-android was computed. net7.0-ios was computed. net7.0-maccatalyst was computed. net7.0-macos was computed. net7.0-tvos was computed. net7.0-windows was computed. net8.0 is compatible. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. net9.0 is compatible.
.NET Core	netcoreapp2.0 was computed. netcoreapp2.1 was computed. netcoreapp2.2 was computed. netcoreapp3.0 was computed. netcoreapp3.1 was computed.
.NET Standard	netstandard2.0 is compatible. netstandard2.1 is compatible.
.NET Framework	net461 was computed. net462 is compatible. net463 was computed. net47 was computed. net471 was computed. net472 was computed. net48 was computed. net481 was computed.
MonoAndroid	monoandroid was computed.
MonoMac	monomac was computed.
MonoTouch	monotouch was computed.
Tizen	tizen40 was computed. tizen60 was computed.
Xamarin.iOS	xamarinios was computed.
Xamarin.Mac	xamarinmac was computed.
Xamarin.TVOS	xamarintvos was computed.
Xamarin.WatchOS	xamarinwatchos was computed.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

.NETFramework 4.6.2
- Microsoft.Bcl.AsyncInterfaces (>= 9.0.0)
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)
- System.Diagnostics.DiagnosticSource (>= 9.0.0)
- System.ValueTuple (>= 4.5.0)
.NETStandard 2.0
- Microsoft.Bcl.AsyncInterfaces (>= 9.0.0)
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)
- System.Diagnostics.DiagnosticSource (>= 9.0.0)
.NETStandard 2.1
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)
- System.Diagnostics.DiagnosticSource (>= 9.0.0)
net8.0
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)
net9.0
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)

NuGet packages (5.7K)

Showing the top 5 NuGet packages that depend on Microsoft.Extensions.Logging:

Package	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	1.3B
Microsoft.EntityFrameworkCore.Relational Shared Entity Framework Core components for relational database providers.	1.3B
Microsoft.Extensions.Logging.Configuration Configuration support for Microsoft.Extensions.Logging.	1.1B
Microsoft.Extensions.Http The HttpClient factory is a pattern for configuring and retrieving named HttpClients in a composable way. The HttpClient factory provides extensibility to plug in DelegatingHandlers that address cross-cutting concerns such as service location, load balancing, and reliability. The default HttpClient factory provides built-in diagnostics and logging and manages the lifetimes of connections in a performant way. Commonly Used Types: System.Net.Http.IHttpClientFactory	1.1B
Microsoft.Extensions.Logging.Console Console logger provider implementation for Microsoft.Extensions.Logging.	864.2M

GitHub repositories (640)

Showing the top 5 popular GitHub repositories that depend on Microsoft.Extensions.Logging:

Repository	Stars
microsoft/PowerToys Windows system utilities to maximize productivity	113.0K
jellyfin/jellyfin The Free Software Media System - Server Backend & API	36.0K
files-community/Files A modern file manager that helps users organize their files and folders.	35.2K
DevToys-app/DevToys A Swiss Army knife for developers.	27.7K
microsoft/semantic-kernel Integrate cutting-edge LLM technology quickly and easily into your apps	22.5K

Version	Downloads	Last updated
9.0.0	5,804,693	11/12/2024
9.0.0-rc.2.24473.5	339,032	10/8/2024
9.0.0-rc.1.24431.7	293,155	9/10/2024
9.0.0-preview.7.24405.7	126,124	8/13/2024
9.0.0-preview.6.24327.7	179,614	7/9/2024
9.0.0-preview.5.24306.7	127,583	6/11/2024
9.0.0-preview.4.24266.19	112,694	5/21/2024
9.0.0-preview.3.24172.9	264,929	4/11/2024
9.0.0-preview.2.24128.5	150,171	3/12/2024
9.0.0-preview.1.24080.9	155,399	2/13/2024
8.0.1	22,431,705	10/8/2024
8.0.0	198,431,220	11/14/2023
8.0.0-rc.2.23479.6	1,754,391	10/10/2023
8.0.0-rc.1.23419.4	1,061,014	9/12/2023
8.0.0-preview.7.23375.6	582,791	8/8/2023
8.0.0-preview.6.23329.7	358,539	7/11/2023
8.0.0-preview.5.23280.8	246,906	6/13/2023
8.0.0-preview.4.23259.5	466,229	5/16/2023
8.0.0-preview.3.23174.8	380,764	4/11/2023
8.0.0-preview.2.23128.3	301,299	3/14/2023
8.0.0-preview.1.23110.8	222,168	2/21/2023
7.0.0	233,475,002	11/7/2022
7.0.0-rc.2.22472.3	426,407	10/11/2022
7.0.0-rc.1.22426.10	373,074	9/14/2022
7.0.0-preview.7.22375.6	356,290	8/9/2022
7.0.0-preview.6.22324.4	177,138	7/12/2022
7.0.0-preview.5.22301.12	153,946	6/14/2022
7.0.0-preview.4.22229.4	357,389	5/10/2022
7.0.0-preview.3.22175.4	166,197	4/13/2022
7.0.0-preview.2.22152.2	211,630	3/14/2022
7.0.0-preview.1.22076.8	111,786	2/17/2022
6.0.1	324,202	11/12/2024
6.0.0	507,409,443	11/8/2021
6.0.0-rc.2.21480.5	1,348,409	10/12/2021
6.0.0-rc.1.21451.13	513,722	9/14/2021
6.0.0-preview.7.21377.19	346,415	8/10/2021
6.0.0-preview.6.21352.12	267,085	7/14/2021
6.0.0-preview.5.21301.5	245,130	6/15/2021
6.0.0-preview.4.21253.7	120,588	5/24/2021
6.0.0-preview.3.21201.4	547,889	4/8/2021
6.0.0-preview.2.21154.6	195,295	3/11/2021
6.0.0-preview.1.21102.12	220,501	2/12/2021
5.0.0	460,604,315	11/9/2020
5.0.0-rc.2.20475.5	626,636	10/13/2020
5.0.0-rc.1.20451.14	512,330	9/14/2020
5.0.0-preview.8.20407.11	474,307	8/25/2020
5.0.0-preview.7.20364.11	216,131	7/21/2020
5.0.0-preview.6.20305.6	89,212	6/25/2020
5.0.0-preview.5.20278.1	55,616	6/10/2020
5.0.0-preview.4.20251.6	220,588	5/18/2020
5.0.0-preview.3.20215.2	205,087	4/23/2020
5.0.0-preview.2.20160.3	222,696	4/2/2020
5.0.0-preview.1.20120.4	80,876	3/16/2020
3.1.32	11,361,873	12/13/2022
3.1.31	2,172,436	11/8/2022
3.1.30	2,290,058	10/11/2022
3.1.29	2,040,321	9/13/2022
3.1.28	2,474,529	8/9/2022
3.1.27	1,871,814	7/12/2022
3.1.26	1,613,280	6/14/2022
3.1.25	2,597,782	5/10/2022
3.1.24	1,712,433	4/11/2022
3.1.23	3,083,705	3/8/2022
3.1.22	15,407,943	12/14/2021
3.1.21	6,625,821	11/7/2021
3.1.20	3,881,434	10/11/2021
3.1.19	4,743,331	9/14/2021
3.1.18	42,779,363	8/10/2021
3.1.17	5,843,124	7/13/2021
3.1.16	9,760,990	6/8/2021
3.1.15	7,029,542	5/11/2021
3.1.14	9,426,541	4/6/2021
3.1.13	12,183,102	3/9/2021
3.1.12	10,047,297	2/9/2021
3.1.11	11,829,329	1/12/2021
3.1.10	20,256,097	11/9/2020
3.1.9	66,719,386	10/13/2020
3.1.8	59,929,499	9/8/2020
3.1.7	31,056,047	8/11/2020
3.1.6	35,886,260	7/14/2020
3.1.5	35,336,724	6/9/2020
3.1.4	40,342,069	5/12/2020
3.1.3	95,042,262	3/24/2020
3.1.2	71,370,173	2/18/2020
3.1.1	38,390,878	1/14/2020
3.1.0	155,338,824	12/3/2019
3.1.0-preview3.19553.2	223,722	11/13/2019
3.1.0-preview2.19525.4	71,763	11/1/2019
3.1.0-preview1.19506.1	1,173,105	10/15/2019
3.0.3	71,171,538	2/18/2020
3.0.2	1,042,934	1/14/2020
3.0.1	4,507,279	11/18/2019
3.0.0	85,020,461	9/23/2019
3.0.0-rc1.19456.10	85,490	9/16/2019
3.0.0-preview9.19423.4	1,484,509	9/4/2019
3.0.0-preview8.19405.4	546,564	8/13/2019
3.0.0-preview7.19362.4	156,260	7/23/2019
3.0.0-preview6.19304.6	306,307	6/12/2019
3.0.0-preview5.19227.9	764,710	5/6/2019
3.0.0-preview4.19216.2	48,391	4/18/2019
3.0.0-preview3.19153.1	325,962	3/6/2019
3.0.0-preview.19074.2	165,461	1/29/2019
3.0.0-preview.18572.1	145,667	12/4/2018
2.2.0	231,701,235	12/3/2018
2.2.0-preview3-35497	379,978	10/17/2018
2.2.0-preview2-35157	255,115	9/12/2018
2.2.0-preview1-35029	140,019	8/22/2018
2.1.1	362,280,441	6/18/2018
2.1.0	316,651,773	5/29/2018
2.1.0-rc1-final	544,002	5/6/2018
2.1.0-preview2-final	518,775	4/10/2018
2.1.0-preview1-final	608,553	2/26/2018
2.0.2	24,784,053	5/7/2018
2.0.1	42,364,765	3/13/2018
2.0.0	321,008,594	8/11/2017
2.0.0-preview2-final	350,133	6/28/2017
2.0.0-preview1-final	1,132,307	5/10/2017
1.1.2	16,132,577	5/9/2017
1.1.1	29,056,419	3/6/2017
1.1.0	15,764,566	11/16/2016
1.1.0-preview1-final	175,139	10/24/2016
1.0.2	78,423,867	3/6/2017
1.0.1	4,557,132	12/12/2016
1.0.0	25,503,803	6/27/2016
1.0.0-rc2-final	1,818,236	5/16/2016
1.0.0-rc1-final	647,163	11/18/2015

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Total 3.9B

Current version 5.8M

Per day average 1.2M

Microsoft.Extensions.Logging 9.0.0

About

Key Features

How to Use

Baggage and Tags for ActivityTrackingOptions

Main Types

Additional Documentation

Related Packages

Feedback & Contributing

.NETFramework 4.6.2

.NETStandard 2.0

.NETStandard 2.1

net8.0

net9.0

NuGet packages (5.7K)

GitHub repositories (640)

Baggage and Tags for `ActivityTrackingOptions`