ExtensionRegistry public sealed class ExtensionRegistry : ICollection<Extension>, IEnumerable<Extension>, IEnumerable, IDeepCloneable<ExtensionRegistry> Documentation public int Count { get; } public ExtensionRegistry() public void Add(Extension extension) public void AddRange(IEnumerable<Extension> extensions) public void Clear() public ExtensionRegistry Clone() public bool Contains(Extension item) public IEnumerator<Extension> GetEnumerator() public bool Remove(Extension item)