xamarinmac 
namespace System.Composition
{
    public abstract class CompositionContext
    {
        public TExport GetExport<TExport>();
    }
}
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assemblies

System.Composition.Runtime , Version=9.0.0.3, PublicKeyToken=b03f5f7f11d50a3a

System.Composition.Runtime , Version=10.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Composition.Runtime.

Package System.Composition.Runtime (9.0.3) netstandard2.0
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API