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ExcludeFromCodeCoverage ignored in optimized instrumentation mode?
#1 Posted : Tuesday, December 17, 2019 2:21:59 PM(UTC)
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If I switch from legacy to optimized instrumentation modes, my code coverage for a certain project drops from 78.23% to 50.33%. This project makes significant use of the [ExcludeFromCodeCoverage] attribute, and looking at the metrics screen, those classes that should be exclude are showing as 0.00% in optimized (whereas the percentage is hidden in legacy).

This seems to be happening mostly just for lambdas, as seen in this example (which only records 1 compiled and uncovered line):
using System;
using System.Diagnostics.CodeAnalysis;
using System.Timers;
public sealed class MyTimer : IDisposable
private Timer timer;
public void Dispose()
public void Register(Action action, TimeSpan interval)
this.timer = new Timer(interval.TotalMilliseconds);
this.timer.Elapsed += (sender, e) => action();

But also in classes with async methods:

static class Test
public static async System.Threading.Tasks.Task Hi()

(the above example shows 2 compiled and uncovered lines, the opening and closing braces of Hi())
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