protobuf-net 与 C#中几种序列化的比较

C#中几种序列化的比较，此次比较只是比较了 序列化的耗时和序列后文件的大小。

几种序列化分别是：

1. XmlSerializer

2. BinaryFormatter

3. DataContractSerializer

4. DataContractJsonSerializer

5. protobuf-net

前四种为.Net 自带的类库，最后一种为 Google Protocol Buffers

首先，选做一个实体类，做为序列化的对象，加入了一个可序列化的字典，让实体类 稍稍的复杂一点。

Code:

    [Serializable]
    [ProtoContract]
    public class User
    {
        [ProtoMember()]
        public int ID { get; set; }
        [ProtoMember()]
        public string Name { get; set; }
        [ProtoMember()]
        public int Age { get; set; }
        [ProtoMember()]
        public SerializableDictionary<Guid, Guid> Dictionary { get; set; }
    }

    [Serializable]
    public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
    {
        public void WriteXml(XmlWriter write)       // Serializer
        {
            var keySerializer = new XmlSerializer(typeof(TKey));
            var valueSerializer = new XmlSerializer(typeof(TValue));

            foreach (KeyValuePair<TKey, TValue> kv in this)
            {
                write.WriteStartElement("SerializableDictionary");
                write.WriteStartElement("key");
                keySerializer.Serialize(write, kv.Key);
                write.WriteEndElement();
                write.WriteStartElement("value");
                valueSerializer.Serialize(write, kv.Value);
                write.WriteEndElement();
                write.WriteEndElement();
            }
        }
        public void ReadXml(XmlReader reader)       // Deserializer
        {
            reader.Read();
            var keySerializer = new XmlSerializer(typeof(TKey));
            var valueSerializer = new XmlSerializer(typeof(TValue));

            while (reader.NodeType != XmlNodeType.EndElement)
            {
                reader.ReadStartElement("SerializableDictionary");
                reader.ReadStartElement("key");
                TKey tk = (TKey)keySerializer.Deserialize(reader);
                reader.ReadEndElement();
                reader.ReadStartElement("value");
                TValue vl = (TValue)valueSerializer.Deserialize(reader);
                reader.ReadEndElement();
                reader.ReadEndElement();
                this.Add(tk, vl);
                reader.MoveToContent();
            }
            reader.ReadEndElement();
        }
        public XmlSchema GetSchema()
        {
            return null;
        }
    }

然后，初始化一个集合，有1000个User对象，每个User对象中的字典，有500对Guid

            var list = new List<User>();

            var random = new Random();

            for (int i = ; i < ; i++)
            {
                var id = random.Next(, );
                var user = new User
                {
                    ID = id,
                    Name = "Name" + id,
                    Age = random.Next(, )
                };

                var dic = new SerializableDictionary<Guid, Guid>();
                for (int j = ; j < ; j++)
                {
                    dic.Add(Guid.NewGuid(), Guid.NewGuid());
                }

                user.Dictionary = dic;

                list.Add(user);
            }

最后，开始序列化，计时用 Stopwatch

1. Xml序列化

            Stopwatch sw = new Stopwatch();

            //XmlSerializer
            sw.Start();
            var xmlSerializer = new XmlSerializer(typeof(List<User>));
            const string xmlfile = "xml.txt";

            var fi = new FileInfo(xmlfile);
            using (var stream = fi.Create())
            {
                xmlSerializer.Serialize(stream, list);
            }
            sw.Stop();

            fi.Refresh();
            Console.WriteLine("XML Time : {0} , Size : {1}K", sw.Elapsed, fi.Length / );

2. 二进制序列化

            //BinarySerializer
            sw.Restart();
            var binarySerializer = new BinaryFormatter();

            const string binaryfile = "binary.txt";

            var binaryfi = new FileInfo(binaryfile);
            using (var stream = binaryfi.Create())
            {
                binarySerializer.Serialize(stream, list);
            }

            sw.Stop();
            binaryfi.Refresh();
            Console.WriteLine("Binary Time : {0} , Size : {1}K", sw.Elapsed, binaryfi.Length / );

3. DataContractSerializer

            //DataContractSerializer
            sw.Restart();
            var dataContractSerializer = new DataContractSerializer(typeof(List<User>));

            const string dataContractfile = "dataContract.txt";

            var dataContractfi = new FileInfo(dataContractfile);
            using (var stream = dataContractfi.Create())
            {
                dataContractSerializer.WriteObject(stream, list);
            }

            sw.Stop();

            fi.Refresh();
            Console.WriteLine("DataContrac Time : {0} , Size : {1}K", sw.Elapsed, dataContractfi.Length / );

4. DataContractJsonSerializer

            //DataContractJsonSerializer
            sw.Restart();
            var dataContractJsonSerializer = new DataContractJsonSerializer(typeof(List<User>));

            const string dataContractJsonfile = "dataContractJson.txt";

            var dataContractJsonfi = new FileInfo(dataContractJsonfile);
            using (var stream = dataContractJsonfi.Create())
            {
                dataContractJsonSerializer.WriteObject(stream, list);
            }

            sw.Stop();

            fi.Refresh();
            Console.WriteLine("DataContractJson Time : {0} , Size : {1}K", sw.Elapsed, dataContractJsonfi.Length / );

5. protobuf-net

            sw.Restart();
            //protobuf-net
            const string protobuffile = "buffer.txt";
            var pbfi = new FileInfo(protobuffile);
            using (var stream = pbfi.Create())
            {
                Serializer.Serialize(stream, list);
            }
            sw.Stop();

            fi.Refresh();
            Console.WriteLine("Protobuf-net Time : {0} , Size : {1}K", sw.Elapsed, pbfi.Length / );

我连续，测了N次，只贴上3次的结果吧：

看这个结果，Protobuf-net 无论序列化速度，还是序列化的体积都完胜其他几种。

此测试只是个人无聊而为，如果有不合理的地方，请大家指出来。