Visual Studio Intellitrace

Visual Studio IntelliTrace

  • Modify Visual Studio's IntelliTrace settings via Debug>IntelliTrace>Open IntelliTrace Settings>IntelliTrace Events>Tracing> Check everything except Assertion under tracing. If you leave the default settings, you won't pick up Debug level tracing - by checking all of the Trace events, you will pick up Debug level messages.

  • Make sure you have the reactiveui-nlog package installed to your unit test assembly (unfortunately, you are out of luck if you are using a Windows Store Test Library, but a "normal" unit test library works fine)

  • Add a file called nlog.config to your unit test project. Make sure you set the "copy to output directory" property to "Copy if newer" or "Copy always" If you leave the default action of "Do not copy" then the nlog.config file won't be copied to your bin directory and nlog won't be able to find its config file, which means it won't know to write to the trace listener.

  • Here is the nlog.config file

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns=""
         xmlns:xsi="" >
    <target name="trace" xsi:type="trace"  layout="RxUI:${message}"/>
    <logger name="ReactiveUI.*"  writeTo="trace" />
  • Register NLogger at the start of your unit test with:
var logManager = Locator.Current.GetService<ILogManager>();

Hint: An easy way to filter the IntelliTrace view to only show ReactiveUI events is to type RxUI into the IntelliTrace window search box