<PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.0-preview.7.25380.108" />

System.Configuration.ConfigurationSectionCollection

Represents a collection of related sections within a configuration file.
namespace System.Configuration { public sealed class ConfigurationSectionCollection : NameObjectCollectionBase { public ConfigurationSection this[string name] { get; } public ConfigurationSection this[int index] { get; } public void Add(string name, ConfigurationSection section); public void Clear(); public void CopyTo(ConfigurationSection[] array, int index); public ConfigurationSection Get(int index); public ConfigurationSection Get(string name); public string GetKey(int index); public void Remove(string name); public void RemoveAt(int index); } }