序列化代理（實現 ISerializationSurrogate）

實現序列化代理選擇器，允許一個物件執行另一個物件的序列化和反序列化

同樣允許正確序列化或反序列化本身不可序列化的類

實現 ISerializationSurrogate 介面

public class ItemSurrogate : ISerializationSurrogate
{
    public void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
    {
        var item = (Item)obj;
        info.AddValue("_name", item.Name);
    }

    public object SetObjectData(object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)
    {
        var item = (Item)obj;
        item.Name = (string)info.GetValue("_name", typeof(string));
        return item;
    }
}

然後你需要通過定義和初始化 SurrogateSelector 並將它分配給你的 IFormatter 來讓你的 IFormatter 瞭解代理。

var surrogateSelector = new SurrogateSelector();
surrogateSelector.AddSurrogate(typeof(Item), new StreamingContext(StreamingContextStates.All), new ItemSurrogate());    
var binaryFormatter = new BinaryFormatter
{
    SurrogateSelector = surrogateSelector
};

即使該類沒有標記為可序列化。

//this class is not serializable
public class Item
{
    private string _name;

    public string Name
    {
        get { return _name; }
        set { _name = value; }
    }
}

完整的解決方案

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

namespace BinarySerializationExample
{
    class Item
    {
        private string _name;

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
    }

    class ItemSurrogate : ISerializationSurrogate
    {
        public void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
        {
            var item = (Item)obj;
            info.AddValue("_name", item.Name);
        }

        public object SetObjectData(object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)
        {
            var item = (Item)obj;
            item.Name = (string)info.GetValue("_name", typeof(string));
            return item;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var item = new Item
            {
                Name = "Orange"
            };

            var bytes = SerializeData(item);
            var deserializedData = (Item)DeserializeData(bytes);
        }

        private static byte[] SerializeData(object obj)
        {
            var surrogateSelector = new SurrogateSelector();
            surrogateSelector.AddSurrogate(typeof(Item), new StreamingContext(StreamingContextStates.All), new ItemSurrogate());

            var binaryFormatter = new BinaryFormatter
            {
                SurrogateSelector = surrogateSelector
            };

            using (var memoryStream = new MemoryStream())
            {
                binaryFormatter.Serialize(memoryStream, obj);
                return memoryStream.ToArray();
            }
        }

        private static object DeserializeData(byte[] bytes)
        {
            var surrogateSelector = new SurrogateSelector();
            surrogateSelector.AddSurrogate(typeof(Item), new StreamingContext(StreamingContextStates.All), new ItemSurrogate());

            var binaryFormatter = new BinaryFormatter
            {
                SurrogateSelector = surrogateSelector
            };

            using (var memoryStream = new MemoryStream(bytes))
                return binaryFormatter.Deserialize(memoryStream);
        }
    }
}