<PackageReference Include="System.Configuration.ConfigurationManager" Version="4.4.0" />

ConfigurationManager

public static class ConfigurationManager
public static NameValueCollection AppSettings { get; }

public static ConnectionStringSettingsCollection ConnectionStrings { get; }

public static object GetSection(string sectionName)

public static Configuration OpenExeConfiguration(ConfigurationUserLevel userLevel)

public static Configuration OpenExeConfiguration(string exePath)

public static Configuration OpenMachineConfiguration()

public static Configuration OpenMappedExeConfiguration(ExeConfigurationFileMap fileMap, ConfigurationUserLevel userLevel)

public static Configuration OpenMappedExeConfiguration(ExeConfigurationFileMap fileMap, ConfigurationUserLevel userLevel, bool preLoad)

public static Configuration OpenMappedMachineConfiguration(ConfigurationFileMap fileMap)

public static void RefreshSection(string sectionName)