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(untitled)

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public abstract class SerializableDictionaryBase<TKey, TValue, TValueStorage> : Dictionary<TKey, TValue>, ISerializationCallbackReceiver
    {
        [SerializeField]
        TKey[] m_keys;
        [SerializeField]
        TValueStorage[] m_values;

public SerializableDictionaryBase()
        {
        }

public SerializableDictionaryBase(IDictionary<TKey, TValue> dict) : base(dict.Count)
        {
            foreach (var kvp in dict)
            {
                this[kvp.Key] = kvp.Value;
            }
        }

protected SerializableDictionaryBase(SerializationInfo info, StreamingContext context) : base(info, context) { }

protected abstract void SetValue(TValueStorage[] storage, int i, TValue value);
        protected abstract TValue GetValue(TValueStorage[] storage, int i);

public void CopyFrom(IDictionary<TKey, TValue> dict)
        {
            this.Clear();
            foreach (var kvp in dict)
            {
                this[kvp.Key] = kvp.Value;
            }
        }

public void OnAfterDeserialize()
        {
            if (m_keys != null && m_values != null && m_keys.Length == m_values.Length)
            {
                this.Clear();
                int n = m_keys.Length;
                for (int i = 0; i < n; ++i)
                {
                    this[m_keys[i]] = GetValue(m_values, i);
                }

m_keys = null;
                m_values = null;
            }

}

public void OnBeforeSerialize()
        {
            int n = this.Count;
            m_keys = new TKey[n];
            m_values = new TValueStorage[n];

int i = 0;
            foreach (var kvp in this)
            {
                m_keys[i] = kvp.Key;
                SetValue(m_values, i, kvp.Value);
                ++i;
            }
        }
    }

public class SerializableDictionary<TKey, TValue> : SerializableDictionaryBase<TKey, TValue, TValue>
    {
        public SerializableDictionary()
        {
        }

public SerializableDictionary(IDictionary<TKey, TValue> dict) : base(dict)
        {
        }

protected SerializableDictionary(SerializationInfo info, StreamingContext context) : base(info, context) { }

protected override TValue GetValue(TValue[] storage, int i)
        {
            return storage[i];
        }

protected override void SetValue(TValue[] storage, int i, TValue value)
        {
            storage[i] = value;
        }
    }

public static class SerializableDictionary
    {
        public class Storage<T>
        {
            public T data;
        }
    }

public class SerializableDictionary<TKey, TValue, TValueStorage> : SerializableDictionaryBase<TKey, TValue, TValueStorage> where TValueStorage : SerializableDictionary.Storage<TValue>, new()
    {
        public SerializableDictionary()
        {
        }

public SerializableDictionary(IDictionary<TKey, TValue> dict) : base(dict)
        {
        }

protected SerializableDictionary(SerializationInfo info, StreamingContext context) : base(info, context) { }

protected override TValue GetValue(TValueStorage[] storage, int i)
        {
            return storage[i].data;
        }

protected override void SetValue(TValueStorage[] storage, int i, TValue value)
        {
            storage[i] = new TValueStorage();
            storage[i].data = value;
        }
    }

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stats: 120 lines, 302 words, 3.48kb