net6.0-windows 
namespace Microsoft.Win32
{
    public sealed class SystemEvents
    {
        public static event SessionEndingEventHandler? SessionEnding;
    }
}
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.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to net6.0
Assemblies

Microsoft.Win32.SystemEvents , Version=9.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Microsoft.Win32.SystemEvents , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to Microsoft.Win32.SystemEvents.

Package Microsoft.Win32.SystemEvents (9.0.3) netstandard2.0
Platform Restrictions

The event adder is only supported on the following platforms:

  • Windows

The event remover is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API