<PackageReference Include="NETStandard.Library" Version="2.0.1" />

System.ComponentModel.Design.Serialization.DesignerLoader

public abstract class DesignerLoader
namespace System.ComponentModel.Design.Serialization { public abstract class DesignerLoader { public virtual bool Loading { get; } protected DesignerLoader(); public abstract void BeginLoad(IDesignerLoaderHost host); public abstract void Dispose(); public virtual void Flush(); } }