Como quería un Diccionario BiDireccional completo (y no solo un Mapa), agregué las funciones que faltaban para convertirlo en una clase IDictionary compatible. Esto se basa en la versión con pares clave-valor únicos. Aquí está el archivo si lo desea (la mayoría del trabajo fue a través de XMLDoc):
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Common
{
/// <summary>Represents a bidirectional collection of keys and values.</summary>
/// <typeparam name="TFirst">The type of the keys in the dictionary</typeparam>
/// <typeparam name="TSecond">The type of the values in the dictionary</typeparam>
[System.Runtime.InteropServices.ComVisible(false)]
[System.Diagnostics.DebuggerDisplay("Count = {Count}")]
//[System.Diagnostics.DebuggerTypeProxy(typeof(System.Collections.Generic.Mscorlib_DictionaryDebugView<,>))]
//[System.Reflection.DefaultMember("Item")]
public class BiDictionary<TFirst, TSecond> : Dictionary<TFirst, TSecond>
{
IDictionary<TSecond, TFirst> _ValueKey = new Dictionary<TSecond, TFirst>();
/// <summary> PropertyAccessor for Iterator over KeyValue-Relation </summary>
public IDictionary<TFirst, TSecond> KeyValue => this;
/// <summary> PropertyAccessor for Iterator over ValueKey-Relation </summary>
public IDictionary<TSecond, TFirst> ValueKey => _ValueKey;
#region Implemented members
/// <Summary>Gets or sets the value associated with the specified key.</Summary>
/// <param name="key">The key of the value to get or set.</param>
/// <Returns>The value associated with the specified key. If the specified key is not found,
/// a get operation throws a <see cref="KeyNotFoundException"/>, and
/// a set operation creates a new element with the specified key.</Returns>
/// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.</exception>
/// <exception cref="T:System.Collections.Generic.KeyNotFoundException">
/// The property is retrieved and <paramref name="key"/> does not exist in the collection.</exception>
/// <exception cref="T:System.ArgumentException"> An element with the same key already
/// exists in the <see cref="ValueKey"/> <see cref="Dictionary<TFirst,TSecond>"/>.</exception>
public new TSecond this[TFirst key]
{
get { return base[key]; }
set { _ValueKey.Remove(base[key]); base[key] = value; _ValueKey.Add(value, key); }
}
/// <Summary>Gets or sets the key associated with the specified value.</Summary>
/// <param name="val">The value of the key to get or set.</param>
/// <Returns>The key associated with the specified value. If the specified value is not found,
/// a get operation throws a <see cref="KeyNotFoundException"/>, and
/// a set operation creates a new element with the specified value.</Returns>
/// <exception cref="T:System.ArgumentNullException"><paramref name="val"/> is null.</exception>
/// <exception cref="T:System.Collections.Generic.KeyNotFoundException">
/// The property is retrieved and <paramref name="val"/> does not exist in the collection.</exception>
/// <exception cref="T:System.ArgumentException"> An element with the same value already
/// exists in the <see cref="KeyValue"/> <see cref="Dictionary<TFirst,TSecond>"/>.</exception>
public TFirst this[TSecond val]
{
get { return _ValueKey[val]; }
set { base.Remove(_ValueKey[val]); _ValueKey[val] = value; base.Add(value, val); }
}
/// <Summary>Adds the specified key and value to the dictionary.</Summary>
/// <param name="key">The key of the element to add.</param>
/// <param name="value">The value of the element to add.</param>
/// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> or <paramref name="value"/> is null.</exception>
/// <exception cref="T:System.ArgumentException">An element with the same key or value already exists in the <see cref="Dictionary<TFirst,TSecond>"/>.</exception>
public new void Add(TFirst key, TSecond value) {
base.Add(key, value);
_ValueKey.Add(value, key);
}
/// <Summary>Removes all keys and values from the <see cref="Dictionary<TFirst,TSecond>"/>.</Summary>
public new void Clear() { base.Clear(); _ValueKey.Clear(); }
/// <Summary>Determines whether the <see cref="Dictionary<TFirst,TSecond>"/> contains the specified
/// KeyValuePair.</Summary>
/// <param name="item">The KeyValuePair to locate in the <see cref="Dictionary<TFirst,TSecond>"/>.</param>
/// <Returns>true if the <see cref="Dictionary<TFirst,TSecond>"/> contains an element with
/// the specified key which links to the specified value; otherwise, false.</Returns>
/// <exception cref="T:System.ArgumentNullException"><paramref name="item"/> is null.</exception>
public bool Contains(KeyValuePair<TFirst, TSecond> item) => base.ContainsKey(item.Key) & _ValueKey.ContainsKey(item.Value);
/// <Summary>Removes the specified KeyValuePair from the <see cref="Dictionary<TFirst,TSecond>"/>.</Summary>
/// <param name="item">The KeyValuePair to remove.</param>
/// <Returns>true if the KeyValuePair is successfully found and removed; otherwise, false. This
/// method returns false if <paramref name="item"/> is not found in the <see cref="Dictionary<TFirst,TSecond>"/>.</Returns>
/// <exception cref="T:System.ArgumentNullException"><paramref name="item"/> is null.</exception>
public bool Remove(KeyValuePair<TFirst, TSecond> item) => base.Remove(item.Key) & _ValueKey.Remove(item.Value);
/// <Summary>Removes the value with the specified key from the <see cref="Dictionary<TFirst,TSecond>"/>.</Summary>
/// <param name="key">The key of the element to remove.</param>
/// <Returns>true if the element is successfully found and removed; otherwise, false. This
/// method returns false if <paramref name="key"/> is not found in the <see cref="Dictionary<TFirst,TSecond>"/>.</Returns>
/// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.</exception>
public new bool Remove(TFirst key) => _ValueKey.Remove(base[key]) & base.Remove(key);
/// <Summary>Gets the key associated with the specified value.</Summary>
/// <param name="value">The value of the key to get.</param>
/// <param name="key">When this method returns, contains the key associated with the specified value,
/// if the value is found; otherwise, the default value for the type of the key parameter.
/// This parameter is passed uninitialized.</param>
/// <Returns>true if <see cref="ValueKey"/> contains an element with the specified value;
/// otherwise, false.</Returns>
/// <exception cref="T:System.ArgumentNullException"><paramref name="value"/> is null.</exception>
public bool TryGetValue(TSecond value, out TFirst key) => _ValueKey.TryGetValue(value, out key);
#endregion
}
}
int[]
cuando espera un valor único?