Logging from Serilog

Serilog is a great addition to the flowering .NET logging community, described as “A no-nonsense logging library for the NoSQL era” on their project page. Serilog works just like other logging frameworks such as log4net and NLog, but offers a great fluent API and the concept of sinks (a bit like appenders in log4net). Sinks are superior to appenders, because they threat errors as objects rather than strings, a perfect fit for elmah.io which itself is built on NoSQL. Serilog already comes with native support for elmah.io, which makes it easy to integrate with any application using Serilog.

In this example we’ll use a ASP.NET MVC project as an example. Neither Serilog nor elmah.io are bound to log errors from web applications, that is why adding this type of logging to your windows and console applications is just as easy. Add the Serilog.Sinks.ElmahIO NuGet package to your project:

Install-Package Serilog.Sinks.ElmahIO

During the installation you will be prompted to input your log id, as with any other installation of elmah.io. To configure Serilog, add the following code to the Application_Start method in global.asax.cs (where LOG_ID is your log id):

var log =
    new LoggerConfiguration()
        .WriteTo.ElmahIO(new Guid("LOG_ID"))
        .CreateLogger();
Log.Logger = log;

First, we create a new LoggerConfiguration and tell it to write to elmah.io. The log object can be used to log errors and you should register this in your IoC container. In this case, we don’t use IoC, that is why the log object is set as the public static Logger property, which makes it accessible from everywhere.

When unhandled exceptions occur, ELMAH ships the errors to elmah.io through the elmah.io NuGet package. No Serilog or even magic is happening there. The fun part begins when we log handled exceptions to Serilog:

try {
    // Do some stuff which may cause an exception
}
catch (Exception e) {
    Log.Error(e, "The actual error message");
}

The Error method tells Serilog to log the error in the configured sinks, which in our case logs to elmah.io. Simple and beautiful.

Logging custom properties

Serilog support logging custom properties in three ways: As part of the log message, through enrichers and using LogContext. All three types of properties are implemented in the elmah.io sink as part of the Data dictionary to elmah.io.

The following example shows how to log all three types of properties:

var logger =
    new LoggerConfiguration()
        .Enrich.WithProperty("ApplicationIdentifier", "MyCoolApp")
        .Enrich.FromLogContext()
        .WriteTo.ElmahIO(new Guid("a6ac10b1-98b3-495f-960e-424fb18e3caf"))
        .CreateLogger();

using (LogContext.PushProperty("ThreadId", Thread.CurrentThread.ManagedThreadId))
{
    logger.Error("This is a message with {Type} properties", "custom");
}

Beneath the Data tab on the logged message details, the ApplicationIdentifier, ThreadId and Type properties can be found.


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