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SYSLIB0018: Reflection-only loading is not supported and throws PlatformNotSupportedException

The following methods are marked as obsolete, starting in .NET 6. Calling them in code generates warning SYSLIB0018 at compile time. These methods throw a PlatformNotSupportedException at runtime.

Workarounds

Reflection-only loading is replaced by the metadata load-context in .NET Core and .NET 5+. For more information, see How to: Inspect assembly contents using MetadataLoadContext.

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 SYSLIB0018

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

// Re-enable the warning.
#pragma warning restore SYSLIB0018

To suppress all the SYSLIB0018 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0018</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.

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