Serializable Dictionary for Unity (by LuviKunG)

SerializedDictionary.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Serializable Dictionary for Unity (by LuviKunG)
// https://gist.github.com/LuviKunG

namespace LuviKunG.Serializables
{
    [Serializable]
    public sealed class SerializedDictionary<T1, T2> : IEnumerable<SerializedDictionaryElement<T1, T2>>
    {
        [SerializeField]
        private List<SerializedDictionaryElement<T1, T2>> m_list;

        public SerializedDictionary()
        {
            m_list = new List<SerializedDictionaryElement<T1, T2>>();
        }

        public SerializedDictionary(IEnumerable<SerializedDictionaryElement<T1, T2>> list)
        {
            m_list = new List<SerializedDictionaryElement<T1, T2>>(list);
        }

        public SerializedDictionaryElement<T1, T2> this[int index]
        {
            get
            {
                return m_list[index];
            }
            set
            {
                m_list[index] = value;
            }
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return ((IEnumerable)m_list).GetEnumerator();
        }

        public IEnumerator<SerializedDictionaryElement<T1, T2>> GetEnumerator()
        {
            return ((IEnumerable<SerializedDictionaryElement<T1, T2>>)m_list).GetEnumerator();
        }

        public int Count => m_list.Count;

        public int IndexOfKey(T1 key)
        {
            for (int i = 0; i < m_list.Count; _ = ++i)
                if (m_list[i].Key.Equals(key))
                    return i;
            return -1;
        }

        public int IndexOfValue(T2 value)
        {
            for (int i = 0; i < m_list.Count; _ = ++i)
                if (m_list[i].Value.Equals(value))
                    return i;
            return -1;
        }

        public void Add(T1 key, T2 value)
        {
            Add(new SerializedDictionaryElement<T1, T2>(key, value));
        }

        public void Add(SerializedDictionaryElement<T1, T2> element)
        {
            int index = IndexOfKey(element.Key);
            if (index < 0)
                m_list.Add(element);
            else
                m_list[index] = element;
        }

        public void RemoveAt(int index)
        {
            m_list.RemoveAt(index);
        }

        public bool RemoveKey(T1 key)
        {
            int index = IndexOfKey(key);
            if (index < 0)
                return false;
            else
            {
                m_list.RemoveAt(index);
                return true;
            }
        }

        public bool RemoveValue(T2 value)
        {
            int index = IndexOfValue(value);
            if (index < 0)
                return false;
            else
            {
                m_list.RemoveAt(index);
                return true;
            }
        }

        public bool ContainsKey(T1 key)
        {
            return IndexOfKey(key) >= 0;
        }

        public void Clear()
        {
            m_list.Clear();
        }

        public void TrimExcess()
        {
            m_list.TrimExcess();
        }

        public void Sort()
        {
            m_list.Sort();
        }

        public void Sort(Comparison<SerializedDictionaryElement<T1, T2>> comparison)
        {
            m_list.Sort(comparison);
        }

        public void SortKey(Comparison<T1> comparison)
        {
            m_list.Sort((lhs, rhs) => comparison(lhs.Key, rhs.Key));
        }

        public void SortValue(Comparison<T2> comparison)
        {
            m_list.Sort((lhs, rhs) => comparison(lhs.Value, rhs.Value));
        }
    }
}

SerializedDictionaryElement.cs

using System;

// Serializable Dictionary for Unity (by LuviKunG)
// https://gist.github.com/LuviKunG

namespace LuviKunG.Serializables
{
    [Serializable]
    public struct SerializedDictionaryElement<T1, T2>
    {
        public T1 Key;
        public T2 Value;

        public SerializedDictionaryElement(T1 key, T2 value)
        {
            Key = key;
            Value = value;
        }
    }
}