How do I disable all Roslyn Code Analyzers?

c# visual-studio visual-studio-2015 roslyn analyzer
JoshVarty picture JoshVarty · Apr 6, 2016 · Viewed 28.8k times · Source

I'm trying to work with a large opensource project that has a handful of Roslyn Code Analyzers. When I open the solution Visual Studio uses ~35% CPU for about 15 minutes. Using PerfView I've figured out that the code analyzers being run on the solution are bogging down Visual Studio.

I know it's possible to disable analyzers on a per-project basis but this solution contains over 100 projects so I'd rather not do this one-by-one.

My question(s):

  • Can I disable all Roslyn Analyzers for a given solution to avoid this?
  • Can I disable all Roslyn Analyzers for all solutions in Visual Studio?

Answer

Amadeusz Wieczorek picture Amadeusz Wieczorek · Apr 6, 2016

You can disable analyzers on a per-project basis.

To do it, right click on Project>References>Analyzers in the Solution Explorer and hit Open Active Rule Set

screenshot with the location of Open Active Rule Set

You can disable individual analyzers or entire bundles of analyzers.

checkboxes to disable analyzers

This creates a <ProjectName>.ruleset file and modifies the <ProjectName>.csproj, which means that you will share this configuration with your team unless you exclude these changes from source control.

Note: Changes are applied after you close and re-open the solution.

Changes to the .csproj:

<Project ...>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <CodeAnalysisRuleSet>Example.ruleset</CodeAnalysisRuleSet>

Example.ruleset file:

<?xml version="1.0" encoding="utf-8"?>
<RuleSet Name="Rules for WpfApplication1" Description="Code analysis rules for WpfApplication1.csproj." ToolsVersion="14.0">
  <Rules AnalyzerId="Microsoft.CodeAnalysis.CSharp" RuleNamespace="Microsoft.CodeAnalysis.CSharp">
    <Rule Id="AD0001" Action="None" />
    <Rule Id="CS0028" Action="None" />
...

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