Bean/LinkedHashMap.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace XStart.Bean {
    /// <summary>
    /// 排序的字典
    /// </summary>
    /// <typeparam name="TKey"></typeparam>
    /// <typeparam name="TValue"></typeparam>
    public class LinkedHashMap<TKey, TValue> : IDictionary<TKey, TValue> {
        private readonly Dictionary<TKey, int> _dict;
        private readonly List<KeyValuePair<TKey, TValue>> _list;
        #region constructor
        public LinkedHashMap() {
            _dict = new Dictionary<TKey, int>();
            _list = new List<KeyValuePair<TKey, TValue>>();
        }


        public LinkedHashMap(IEqualityComparer<TKey> comparer) {
            _dict = new Dictionary<TKey, int>(comparer);
            _list = new List<KeyValuePair<TKey, TValue>>();
        }


        public LinkedHashMap(int capacity) {
            _dict = new Dictionary<TKey, int>(capacity);
            _list = new List<KeyValuePair<TKey, TValue>>(capacity);
        }


        public LinkedHashMap(int capacity, IEqualityComparer<TKey> comparer) {
            _dict = new Dictionary<TKey, int>(capacity, comparer);
            _list = new List<KeyValuePair<TKey, TValue>>(capacity);
        }


        public LinkedHashMap(IEnumerable<KeyValuePair<TKey, TValue>> source) {
            if (source == null) {
                throw new ArgumentNullException(nameof(source));
            }
            if (source is ICollection countable) {
                _dict = new Dictionary<TKey, int>(countable.Count);
                _list = new List<KeyValuePair<TKey, TValue>>(countable.Count);
            } else {
                _dict = new Dictionary<TKey, int>();
                _list = new List<KeyValuePair<TKey, TValue>>();
            }
            foreach (var pair in source) {
                this[pair.Key] = pair.Value;
            }
        }


        public LinkedHashMap(IEnumerable<KeyValuePair<TKey, TValue>> source, IEqualityComparer<TKey> comparer) {
            if (source == null) {
                throw new ArgumentNullException(nameof(source));
            }