Unity中JsonUtility对List<T>和Dictionary<Key,Value>的序列化

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Unity5.3从开始追加的JsonUtility，但是对于List 和Dictionary不能被直接序列化存储

例如：

数据模型

using UnityEngine;using System;using System.Collections.Generic;[Serializable]public class Enemy{    [SerializeField]    string name;    [SerializeField]    List<string> skills;    public Enemy(string name, List<string> skills)    {        this.name = name;        this.skills = skills;    }}

实际使用

List<Enemy> enemies = new List<Enemy>();enemies.Add(new Enemy("怪物1", new List<string>() { "攻击" }));enemies.Add(new Enemy("怪物2", new List<string>() { "攻击", "恢复" }));Debug.Log(JsonUtility.ToJson(enemies));

输出为：{}

输出是没有任何的json字符串。

在unity的官方网站,ISerializationCallbackReceiver继承的方法被提出,

// Serialization.csusing UnityEngine;using System.Collections;using System.Collections.Generic;using System;// List<T>[Serializable]public class Serialization<T>{    [SerializeField]    List<T> target;    public List<T> ToList() { return target; }    public Serialization(List<T> target)    {        this.target = target;    }}// Dictionary<TKey, TValue>[Serializable]public class Serialization<TKey, TValue> : ISerializationCallbackReceiver{    [SerializeField]    List<TKey> keys;    [SerializeField]    List<TValue> values;    Dictionary<TKey, TValue> target;    public Dictionary<TKey, TValue> ToDictionary() { return target; }    public Serialization(Dictionary<TKey, TValue> target)    {        this.target = target;    }    public void OnBeforeSerialize()    {        keys = new List<TKey>(target.Keys);        values = new List<TValue>(target.Values);    }    public void OnAfterDeserialize()    {        var count = Math.Min(keys.Count, values.Count);        target = new Dictionary<TKey, TValue>(count);        for (var i = 0; i < count; ++i)        {            target.Add(keys[i], values[i]);        }    }}

使用

// List<T> -> Json ( 例 : List<Enemy> )string str = JsonUtility.ToJson(new Serialization<Enemy>(enemies)); // 输出 : {"target":[{"name":"怪物1,"skills":["攻击"]},{"name":"怪物2","skills":["攻击","恢复"]}]}// Json-> List<T>List<Enemy> enemies = JsonUtility.FromJson<Serialization<Enemy>>(str).ToList();// Dictionary<TKey,TValue> -> Json( 例 : Dictionary<int, Enemy> )string str = JsonUtility.ToJson(new Serialization<int, Enemy>(enemies)); // 输出 : {"keys":[1000,2000],"values":[{"name":"怪物1","skills":["攻击"]},{"name":"怪物2","skills":["攻击","恢复"]}]}// Json -> Dictionary<TKey,TValue>Dictionary<int, Enemy> enemies = JsonUtility.FromJson<Serialization<int, Enemy>>(str).ToDictionary();

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