Enum Label Path C++ Link Google.Protobuf.Reflection.FieldDescriptorProto.Types.Label, Google.Protobuf underlying int32 Google.Protobuf.dll Values 3 NameValueHex Optional10x01Repeated30x03Required20x02 Used by 1types with a member, parameter or interface of this type FieldDescriptorProto // Google.Protobuf.Reflection.FieldDescriptorProto.Types.Label, Google.Protobuf enum class Label : int32 { Optional = 1, Repeated = 3, Required = 2, };