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SYSLIB0015: DisablePrivateReflectionAttribute is obsolete

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Starting in .NET 6, the System.Runtime.CompilerServices.DisablePrivateReflectionAttribute type is marked as obsolete. This attribute has no effect in .NET Core 2.1 and later apps. Using it in code generates warning SYSLIB0015 at compile time for .NET 6 and later apps.

For more information, see https://github.com/dotnet/runtime/issues/11811.

Workarounds

None.

Suppress a warning

If you must use the obsolete APIs, you can suppress the warning in code or in your project file.

To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.

// Disable the warning.
#pragma warning disable SYSLIB0015

// Code that uses obsolete API.
// ...

// Re-enable the warning.
#pragma warning restore SYSLIB0015

To suppress all the SYSLIB0015 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0015</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.