Microsoft.Extensions.Logging 9.0.0
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
Related Packages
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.
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Microsoft.Extensions.Hosting
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935 |
|
Microsoft.Extensions.Logging.Console
Console logger provider implementation for Microsoft.Extensions.Logging.
|
918 |
|
Microsoft.Extensions.Logging.EventSource
EventSource/EventListener logger provider implementation for Microsoft.Extensions.Logging.
|
911 |
|
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().
|
908 |
|
Microsoft.Extensions.Logging.Configuration
Configuration support for Microsoft.Extensions.Logging.
|
906 |
|
Microsoft.Extensions.Logging.EventLog
Windows Event Log logger provider implementation for Microsoft.Extensions.Logging.
|
902 |
|
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
|
721 |
|
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
|
461 |
|
Microsoft.Extensions.Hosting
Hosting and startup infrastructures for applications.
|
418 |
|
Microsoft.Extensions.Logging.EventLog
Windows Event Log logger provider implementation for Microsoft.Extensions.Logging.
|
411 |
|
Microsoft.Extensions.Logging.Console
Console logger provider implementation for Microsoft.Extensions.Logging.
|
410 |
|
Microsoft.Extensions.Logging.EventSource
EventSource/EventListener logger provider implementation for Microsoft.Extensions.Logging.
|
409 |
|
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().
|
405 |
|
Microsoft.Extensions.Logging.Configuration
Configuration support for Microsoft.Extensions.Logging.
|
400 |
|
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
|
367 |
|
EasyCaching.Core
EasyCaching is a open source caching library that contains basic usages and some advanced usages of caching which can help us to handle caching more easier!
|
349 |
|
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
|
338 |
|
Microsoft.Extensions.Identity.Core
ASP.NET Core Identity is the membership system for building ASP.NET Core web applications, including membership, login, and user data. ASP.NET Core Identity allows you to add login features to your application and makes it easy to customize data about the logged in user.
This package was built from the source code at https://github.com/dotnet/aspnetcore/tree/c2a442982e736e17ae6bcadbfd8ccba278ee1be6
|
283 |
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.NET Framework 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)
.NET 8.0
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)
.NET 9.0
- Microsoft.Extensions.DependencyInjection (>= 9.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.0)
- Microsoft.Extensions.Options (>= 9.0.0)
.NET Standard 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)
.NET Standard 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)