<PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0-rc.1.22426.10" />

LocalFileSettingsProvider

public class LocalFileSettingsProvider : SettingsProvider, IApplicationSettingsProvider
This is a provider used to store configuration settings locally for client applications.
public LocalFileSettingsProvider()

public SettingsPropertyValue GetPreviousVersion(SettingsContext context, SettingsProperty property)

Implementation of IClientSettingsProvider.GetPreviousVersion.

public void Reset(SettingsContext context)

Implementation of IClientSettingsProvider.Reset. Resets user scoped settings to the values in app.exe.config, does nothing for app scoped settings.

public void Upgrade(SettingsContext context, SettingsPropertyCollection properties)

Implementation of IClientSettingsProvider.Upgrade. Tries to locate a previous version of the user.config file. If found, it migrates matching settings. If not, it does nothing.