Suppressing issues from Roslyn code Analyzers

Question

Is there any way to suppress the issues from the Roslyn Analyzers? I use the instant analyzer project type. And I want to suppress the issues if the user wants it. Also it must be permanent. If I reopen Visual Studio, the same suppression rules must still be applied.

Answer 1

In Visual Studio 2017 you can disable Roslyn warnings (like IDE0002, IDE0003, etc.) in project properties:

You can directly edit csproj file if neccessary:

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
    <NoWarn>IDE0002;1701;1702;1705</NoWarn>
  </PropertyGroup>

As you can see you need to write it with IDE prefix (exactly as it is reported by Roslyn). You have to do that for each build configuration. I think it is fastest and most clear way to disable it for whole project.

Pragma works a bit different most likely due to a bug in VS (so I guess it can be changed later).
For example #pragma warning disable IDE0002 will not show Roslyn messages but it will still highlight code (more grayed).

Answer 2

You can ignore warnings/errors from Roslyn analyzers in exactly the same ways as ignoring normal C# compiler warnings:

• #pragma disable within source code
• The Project Properties / Build / Errors and Warnings setting
• The [SuppressMessage] attribute