.NET6新东西--ConfigurationManager

/// 
    /// Configuration is mutable configuration object. It is both an  and an .
    /// As sources are added, it updates its current view of configuration. Once Build is called, configuration is frozen.
    /// 
    public sealed class ConfigurationManager : IConfigurationBuilder, IConfigurationRoot, IDisposable
    {
        private readonly ConfigurationSources _sources;
        private readonly ConfigurationBuilderProperties _properties;

        private readonly object _providerLock = new();
        private readonly List<IConfigurationProvider> _providers = new();
        private readonly List<IDisposable> _changeTokenRegistrations = new();
        private ConfigurationReloadToken _changeToken = new();
    	//more code
    	//....
    	 // Don't rebuild and reload all providers in the common case when a source is simply added to the IList.
        private void AddSource(IConfigurationSource source)
        {
            lock (_providerLock)
            {
                var provider = source.Build(this);
                _providers.Add(provider);

                provider.Load();
                _changeTokenRegistrations.Add(ChangeToken.OnChange(() => provider.GetReloadToken(), () => RaiseChanged()));
            }

            RaiseChanged();
        }
            //more code
            //.....
    }