netcoreapp2.0 
namespace System.IO.Packaging
{
    public abstract class Package : IDisposable
    {
        protected abstract void FlushCore();
    }
}
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.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 3.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to netcoreapp2.0
Assemblies

System.IO.Packaging , Version=9.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

System.IO.Packaging , Version=10.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.IO.Packaging.

Package System.IO.Packaging (9.0.3) netstandard2.0
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API