<PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0-preview.3.22175.4" />

StoredSetting

struct StoredSetting
The ClientSettingsStore talks to the LocalFileSettingsProvider through a dictionary which maps from setting names to StoredSetting structs. This struct contains the relevant information.
using System.Xml; namespace System.Configuration { internal struct StoredSetting { internal SettingsSerializeAs SerializeAs; internal XmlNode Value; internal StoredSetting(SettingsSerializeAs serializeAs, XmlNode value) { SerializeAs = serializeAs; Value = value; } } }