D365FodyLogging.cs

public void Execute(IServiceProvider serviceProvider)
{
    ITracingService tracer = (ITracingService)serviceProvider.GetService(typeof(ITracingService));

    MethodTimeLogger.Tracer = tracer;
    
    // What manually setting up method timing might look like
    ManualTimer(tracer);

    // What using IL weaving to inject logging looks like
    IlWeavngTimer();
}

private void ManualTimer(ITracingService tracer)
{
    // Create new stopwatch.
    Stopwatch stopwatch = new Stopwatch();

    // Begin timing.
    stopwatch.Start();

    // Do something.
    Thread.Sleep(5000);

    // Stop timing.
    stopwatch.Stop();

    // Get the current method name
    var methodName = MethodBase.GetCurrentMethod().Name;

    // Write result.
    tracer.Trace($"{methodName} Method Time elapsed: {stopwatch.ElapsedMilliseconds}ms");
}

[Time]
private void IlWeavngTimer()
{
    // Do something.
    Thread.Sleep(5000);
}

//What got compiled
private void IlWeavngTimerCompiled()
{
    Stopwatch stopwatch = Stopwatch.StartNew();
    try
    {
        Thread.Sleep(5000);
    }
    finally
    {
        stopwatch.Stop();
        MethodTimeLogger.Log(MethodBase.GetMethodFromHandle(typeof(LoggingTest).GetMethod("AopTime").MethodHandle, typeof(LoggingTest).TypeHandle), stopwatch.ElapsedMilliseconds);
    }
}

internal static class MethodTimeLogger
{
    public static ITracingService Tracer;

    public static void Log(MethodBase methodBase, long milliseconds)
    {
        Tracer.Trace($"{methodBase.Name} Method Time elapsed: {milliseconds}ms");
    }
}

[AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Module | 
    AttributeTargets.Class | AttributeTargets.Method | AttributeTargets.Constructor)]
internal class TimeAttribute : Attribute
{
}