45         private IDictionary<ObjectIntPair<Type>, Extension> extensions;  field in Google.Protobuf.ExtensionRegistry
52             extensions = new Dictionary<ObjectIntPair<Type>, Extension>();  in ExtensionRegistry()
57             extensions = collection.ToDictionary(k => k.Key, v => v.Value);  in ExtensionRegistry()
63         public int Count => extensions.Count;
72 …return extensions.TryGetValue(new ObjectIntPair<Type>(target, WireFormat.GetTagFieldNumber(stream.…  in ContainsInputField()
82 …   extensions.Add(new ObjectIntPair<Type>(extension.TargetType, extension.FieldNumber), extension);  in Add()
88         public void AddRange(IEnumerable<Extension> extensions)  in AddRange()  argument
90             ProtoPreconditions.CheckNotNull(extensions, nameof(extensions));  in AddRange()
92             foreach (var extension in extensions)  in AddRange()
101             extensions.Clear();  in Clear()
111 …         return extensions.ContainsKey(new ObjectIntPair<Type>(item.TargetType, item.FieldNumber));  in Contains()
130 …   extensions.Add(new ObjectIntPair<Type>(extension.TargetType, extension.FieldNumber), extension);  in CopyTo()
140             return extensions.Values.GetEnumerator();  in GetEnumerator()
152             return extensions.Remove(new ObjectIntPair<Type>(item.TargetType, item.FieldNumber));  in Remove()
162             return new ExtensionRegistry(extensions);  in Clone()