Serilog.AspNetCore 8.0.1

Prefix Reserved
There is a newer prerelease version of this package available.
See the version list below for details.
dotnet add package Serilog.AspNetCore --version 8.0.1                
NuGet\Install-Package Serilog.AspNetCore -Version 8.0.1                
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="Serilog.AspNetCore" Version="8.0.1" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Serilog.AspNetCore --version 8.0.1                
#r "nuget: Serilog.AspNetCore, 8.0.1"                
#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 Serilog.AspNetCore as a Cake Addin
#addin nuget:?package=Serilog.AspNetCore&version=8.0.1

// Install Serilog.AspNetCore as a Cake Tool
#tool nuget:?package=Serilog.AspNetCore&version=8.0.1                

Serilog.AspNetCore Build status NuGet Version NuGet Prerelease Version

Serilog logging for ASP.NET Core. This package routes ASP.NET Core log messages through Serilog, so you can get information about ASP.NET's internal operations written to the same Serilog sinks as your application events.

With Serilog.AspNetCore installed and configured, you can write log messages directly through Serilog or any ILogger interface injected by ASP.NET. All loggers will use the same underlying implementation, levels, and destinations.

.NET Framework and .NET Core 2.x are supported by version 3.4.0 of this package. Recent versions of Serilog.AspNetCore require .NET Core 3.x, .NET 5, or later.

Instructions

First, install the Serilog.AspNetCore NuGet package into your app.

dotnet add package Serilog.AspNetCore

Next, in your application's Program.cs file, configure Serilog first. A try/catch block will ensure any configuration issues are appropriately logged:

using Serilog;

Log.Logger = new LoggerConfiguration()
    .WriteTo.Console()
    .CreateLogger();

try
{
    Log.Information("Starting web application");

    var builder = WebApplication.CreateBuilder(args);

    builder.Host.UseSerilog(); // <-- Add this line
    
    var app = builder.Build();

    app.MapGet("/", () => "Hello World!");

    app.Run();
}
catch (Exception ex)
{
    Log.Fatal(ex, "Application terminated unexpectedly");
}
finally
{
    Log.CloseAndFlush();
}

The builder.Host.UseSerilog() call will redirect all log events through your Serilog pipeline.

Finally, clean up by removing the remaining configuration for the default logger, including the "Logging" section from appsettings.*.json files (this can be replaced with Serilog configuration as shown in the Sample project, if required).

That's it! With the level bumped up a little you will see log output resembling:

[22:14:44.646 DBG] RouteCollection.RouteAsync
    Routes: 
        Microsoft.AspNet.Mvc.Routing.AttributeRoute
        {controller=Home}/{action=Index}/{id?}
    Handled? True
[22:14:44.647 DBG] RouterMiddleware.Invoke
    Handled? True
[22:14:45.706 DBG] /lib/jquery/jquery.js not modified
[22:14:45.706 DBG] /css/site.css not modified
[22:14:45.741 DBG] Handled. Status code: 304 File: /css/site.css

Tip: to see Serilog output in the Visual Studio output window when running under IIS, either select ASP.NET Core Web Server from the Show output from drop-down list, or replace WriteTo.Console() in the logger configuration with WriteTo.Debug().

A more complete example, including appsettings.json configuration, can be found in the sample project here.

Request logging

The package includes middleware for smarter HTTP request logging. The default request logging implemented by ASP.NET Core is noisy, with multiple events emitted per request. The included middleware condenses these into a single event that carries method, path, status code, and timing information.

As text, this has a format like:

[16:05:54 INF] HTTP GET / responded 200 in 227.3253 ms

Or as JSON:

{
  "@t": "2019-06-26T06:05:54.6881162Z",
  "@mt": "HTTP {RequestMethod} {RequestPath} responded {StatusCode} in {Elapsed:0.0000} ms",
  "@r": ["224.5185"],
  "RequestMethod": "GET",
  "RequestPath": "/",
  "StatusCode": 200,
  "Elapsed": 224.5185,
  "RequestId": "0HLNPVG1HI42T:00000001",
  "CorrelationId": null,
  "ConnectionId": "0HLNPVG1HI42T"
}

To enable the middleware, first change the minimum level for Microsoft.AspNetCore to Warning in your logger configuration or appsettings.json file:

            .MinimumLevel.Override("Microsoft.AspNetCore", LogEventLevel.Warning)

Then, in your application's Program.cs, add the middleware with UseSerilogRequestLogging():

    var app = builder.Build();

    app.UseSerilogRequestLogging(); // <-- Add this line

    // Other app configuration

It's important that the UseSerilogRequestLogging() call appears before handlers such as MVC. The middleware will not time or log components that appear before it in the pipeline. (This can be utilized to exclude noisy handlers from logging, such as UseStaticFiles(), by placing UseSerilogRequestLogging() after them.)

During request processing, additional properties can be attached to the completion event using IDiagnosticContext.Set():

    public class HomeController : Controller
    {
        readonly IDiagnosticContext _diagnosticContext;

        public HomeController(IDiagnosticContext diagnosticContext)
        {
            _diagnosticContext = diagnosticContext ??
                throw new ArgumentNullException(nameof(diagnosticContext));
        }

        public IActionResult Index()
        {
            // The request completion event will carry this property
            _diagnosticContext.Set("CatalogLoadTime", 1423);

            return View();
        }

This pattern has the advantage of reducing the number of log events that need to be constructed, transmitted, and stored per HTTP request. Having many properties on the same event can also make correlation of request details and other data easier.

The following request information will be added as properties by default:

  • RequestMethod
  • RequestPath
  • StatusCode
  • Elapsed

You can modify the message template used for request completion events, add additional properties, or change the event level, using the options callback on UseSerilogRequestLogging():

app.UseSerilogRequestLogging(options =>
{
    // Customize the message template
    options.MessageTemplate = "Handled {RequestPath}";
    
    // Emit debug-level events instead of the defaults
    options.GetLevel = (httpContext, elapsed, ex) => LogEventLevel.Debug;
    
    // Attach additional properties to the request completion event
    options.EnrichDiagnosticContext = (diagnosticContext, httpContext) =>
    {
        diagnosticContext.Set("RequestHost", httpContext.Request.Host.Value);
        diagnosticContext.Set("RequestScheme", httpContext.Request.Scheme);
    };
});

Two-stage initialization

The example at the top of this page shows how to configure Serilog immediately when the application starts. This has the benefit of catching and reporting exceptions thrown during set-up of the ASP.NET Core host.

The downside of initializing Serilog first is that services from the ASP.NET Core host, including the appsettings.json configuration and dependency injection, aren't available yet.

To address this, Serilog supports two-stage initialization. An initial "bootstrap" logger is configured immediately when the program starts, and this is replaced by the fully-configured logger once the host has loaded.

To use this technique, first replace the initial CreateLogger() call with CreateBootstrapLogger():

using Serilog;
using Serilog.Events;

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
    .Enrich.FromLogContext()
    .WriteTo.Console()
    .CreateBootstrapLogger(); // <-- Change this line!

Then, pass a callback to UseSerilog() that creates the final logger:

builder.Host.UseSerilog((context, services, configuration) => configuration
    .ReadFrom.Configuration(context.Configuration)
    .ReadFrom.Services(services)
    .Enrich.FromLogContext()
    .WriteTo.Console());

It's important to note that the final logger completely replaces the bootstrap logger: if you want both to log to the console, for instance, you'll need to specify WriteTo.Console() in both places, as the example shows.

Consuming appsettings.json configuration

Using two-stage initialization, insert the ReadFrom.Configuration(context.Configuration) call shown in the example above. The JSON configuration syntax is documented in the Serilog.Settings.Configuration README.

Injecting services into enrichers and sinks

Using two-stage initialization, insert the ReadFrom.Services(services) call shown in the example above. The ReadFrom.Services() call will configure the logging pipeline with any registered implementations of the following services:

  • IDestructuringPolicy
  • ILogEventEnricher
  • ILogEventFilter
  • ILogEventSink
  • LoggingLevelSwitch
Enabling Microsoft.Extensions.Logging.ILoggerProviders

Serilog sends events to outputs called sinks, that implement Serilog's ILogEventSink interface, and are added to the logging pipeline using WriteTo. Microsoft.Extensions.Logging has a similar concept called providers, and these implement ILoggerProvider. Providers are what the default logging configuration creates under the hood through methods like AddConsole().

By default, Serilog ignores providers, since there are usually equivalent Serilog sinks available, and these work more efficiently with Serilog's pipeline. If provider support is needed, it can be optionally enabled.

To have Serilog pass events to providers, using two-stage initialization as above, pass writeToProviders: true in the call to UseSerilog():

builder.Host.UseSerilog(
        (hostingContext, services, loggerConfiguration) => /* snip! */,
        writeToProviders: true)

JSON output

The Console(), Debug(), and File() sinks all support JSON-formatted output natively, via the included Serilog.Formatting.Compact package.

To write newline-delimited JSON, pass a CompactJsonFormatter or RenderedCompactJsonFormatter to the sink configuration method:

    .WriteTo.Console(new RenderedCompactJsonFormatter())

Writing to the Azure Diagnostics Log Stream

The Azure Diagnostic Log Stream ships events from any files in the D:\home\LogFiles\ folder. To enable this for your app, add a file sink to your LoggerConfiguration, taking care to set the shared and flushToDiskInterval parameters:

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Debug()
    .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
    .Enrich.FromLogContext()
    .WriteTo.Console()
    // Add this line:
    .WriteTo.File(
       System.IO.Path.Combine(Environment.GetEnvironmentVariable("HOME"), "LogFiles", "Application", "diagnostics.txt"),
       rollingInterval: RollingInterval.Day,
       fileSizeLimitBytes: 10 * 1024 * 1024,
       retainedFileCountLimit: 2,
       rollOnFileSizeLimit: true,
       shared: true,
       flushToDiskInterval: TimeSpan.FromSeconds(1))
    .CreateLogger();

Pushing properties to the ILogger<T>

If you want to add extra properties to all log events in a specific part of your code, you can add them to the ILogger<T> in Microsoft.Extensions.Logging with the following code. For this code to work, make sure you have added the .Enrich.FromLogContext() to the .UseSerilog(...) statement, as specified in the samples above.

// Microsoft.Extensions.Logging ILogger<T>
// Yes, it's required to use a dictionary. See https://nblumhardt.com/2016/11/ilogger-beginscope/
using (logger.BeginScope(new Dictionary<string, object>
{
    ["UserId"] = "svrooij",
    ["OperationType"] = "update",
}))
{
   // UserId and OperationType are set for all logging events in these brackets
}

The code above results in the same outcome as if you would push properties in the ILogger in Serilog.

// Serilog ILogger
using (logger.PushProperty("UserId", "svrooij"))
using (logger.PushProperty("OperationType", "update"))
{
    // UserId and OperationType are set for all logging events in these brackets
}

Versioning

This package tracks the versioning and target framework support of its (indirect) Microsoft.Extensions.Hosting dependency.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  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 is compatible.  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. 
.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 was computed. 
.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.

NuGet packages (1.3K)

Showing the top 5 NuGet packages that depend on Serilog.AspNetCore:

Package Downloads
Umbraco.Cms.Web.Common

Contains the web assembly needed to run Umbraco CMS.

Umbraco.Cms.Web.BackOffice

Contains the backoffice assembly needed to run the backend of Umbraco CMS.

Apprio.Enablement.Telemetry.Properties

Package Description

Apprio.Enablement.Telemetry

Package Description

NET6CustomLibrary

open source custom dotnet extension library

GitHub repositories (282)

Showing the top 5 popular GitHub repositories that depend on Serilog.AspNetCore:

Repository Stars
jellyfin/jellyfin
The Free Software Media System
ardalis/CleanArchitecture
Clean Architecture Solution Template: A starting point for Clean Architecture with ASP.NET Core
bitwarden/server
Bitwarden infrastructure/backend (API, database, Docker, etc).
dotnet/runtime
.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
abpframework/abp
Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.
Version Downloads Last updated
8.0.2-dev-00341 2,489 7/12/2024
8.0.2-dev-00338 76,221 4/5/2024
8.0.2-dev-00336 6,055 3/25/2024
8.0.2-dev-00334 16,096 3/5/2024
8.0.1 15,838,404 1/19/2024
8.0.1-dev-00329 709 1/19/2024
8.0.0 6,994,984 11/15/2023
8.0.0-dev-00323 550 11/15/2023
7.0.1-dev-00320 65,723 10/11/2023
7.0.0 23,605,275 5/11/2023
7.0.0-dev-00315 626 9/27/2023
7.0.0-dev-00314 586 9/27/2023
7.0.0-dev-00304 954 5/11/2023
7.0.0-dev-00302 4,100 5/5/2023
6.1.1-dev-00295 206,079 2/3/2023
6.1.1-dev-00293 121,081 12/19/2022
6.1.0 40,762,380 11/30/2022
6.1.0-dev-00289 26,407 11/28/2022
6.1.0-dev-00285 181,541 9/27/2022
6.1.0-dev-00281 48,233 8/29/2022
6.0.1 29,737,204 7/18/2022
6.0.1-dev-00280 844 8/29/2022
6.0.1-dev-00275 852 7/18/2022
6.0.0 1,379,347 7/14/2022
6.0.0-dev-00270 890 7/14/2022
6.0.0-dev-00265 314,667 3/4/2022
5.0.1-dev-00264 4,051 3/4/2022
5.0.1-dev-00262 10,973 2/24/2022
5.0.0 36,701,670 2/15/2022
5.0.0-dev-00259 32,069 2/8/2022
4.1.1-dev-00250 64,855 1/19/2022
4.1.1-dev-00241 203,985 11/12/2021
4.1.1-dev-00229 459,935 6/2/2021
4.1.1-dev-00227 13,899 5/27/2021
4.1.0 66,400,678 3/29/2021
4.1.0-dev-00223 1,113 3/29/2021
4.0.1-dev-00222 1,188 3/26/2021
4.0.1-dev-00219 15,465 3/17/2021
4.0.0 3,819,712 3/3/2021
4.0.0-dev-00210 1,080 3/3/2021
4.0.0-dev-00208 1,090 3/3/2021
4.0.0-dev-00206 1,295 3/3/2021
4.0.0-dev-00204 1,113 3/2/2021
4.0.0-dev-00202 10,788 2/24/2021
4.0.0-dev-00199 10,611 2/17/2021
4.0.0-dev-00198 11,033 2/17/2021
3.4.1-dev-00188 479,245 10/26/2020
3.4.1-dev-00180 360,403 9/15/2020
3.4.0 38,112,860 7/24/2020
3.4.0-dev-00177 1,229 7/24/2020
3.4.0-dev-00176 1,163 7/24/2020
3.4.0-dev-00174 1,228 7/24/2020
3.4.0-dev-00173 201,044 6/18/2020
3.4.0-dev-00171 45,504 6/3/2020
3.4.0-dev-00168 16,777 5/19/2020
3.4.0-dev-00167 6,658 5/13/2020
3.3.0-dev-00161 35,262 5/1/2020
3.3.0-dev-00160 1,215 5/1/2020
3.3.0-dev-00152 190,714 2/24/2020
3.3.0-dev-00149 64,963 2/19/2020
3.2.1-dev-00147 14,408 2/19/2020
3.2.1-dev-00142 94,042 1/24/2020
3.2.0 41,244,209 11/12/2019
3.2.0-dev-00135 15,733 11/8/2019
3.2.0-dev-00133 3,185 11/6/2019
3.1.1-dev-00132 1,457 11/6/2019
3.1.0 3,406,014 10/14/2019
3.1.0-dev-00122 12,081 10/7/2019
3.1.0-dev-00119 1,389 10/7/2019
3.1.0-dev-00118 1,349 10/7/2019
3.0.1-dev-00116 12,406 10/2/2019
3.0.1-dev-00110 1,323 10/2/2019
3.0.1-dev-00109 27,048 9/25/2019
3.0.1-dev-00099 61,811 9/3/2019
3.0.0 4,167,371 8/28/2019
3.0.0-dev-00093 1,522 8/27/2019
3.0.0-dev-00088 16,938 8/21/2019
3.0.0-dev-00086 1,430 8/21/2019
3.0.0-dev-00083 1,412 8/20/2019
3.0.0-dev-00081 1,374 8/20/2019
3.0.0-dev-00079 1,332 8/20/2019
3.0.0-dev-00077 1,324 8/20/2019
3.0.0-dev-00067 5,598 8/19/2019
3.0.0-dev-00059 43,431 7/19/2019
3.0.0-dev-00058 34,293 6/26/2019
3.0.0-dev-00057 1,391 6/26/2019
3.0.0-dev-00053 4,282 6/25/2019
3.0.0-dev-00052 1,991 6/25/2019
3.0.0-dev-00046 2,501 6/23/2019
3.0.0-dev-00043 12,776 6/5/2019
3.0.0-dev-00041 2,139 6/3/2019
3.0.0-dev-00040 1,580 6/3/2019
2.1.2-dev-00028 187,220 9/22/2018
2.1.2-dev-00026 56,801 7/19/2018
2.1.2-dev-00024 158,105 5/9/2018
2.1.1 27,788,252 3/7/2018
2.1.1-dev-00022 37,614 1/18/2018
2.1.1-dev-00021 18,087 12/17/2017
2.1.1-dev-00017 7,088 12/3/2017
2.1.0 2,446,978 10/22/2017
2.1.0-dev-00012 1,946 10/16/2017
2.0.1-dev-00011 1,737 10/16/2017
2.0.0 435,379 9/5/2017
2.0.0-dev-00002 5,273 8/29/2017
2.0.0-dev-00001 2,577 8/27/2017