C＃中的双向1对1字典
我在C＃（2）中寻找通用的双向1对1字典类，即。一个BiDictionaryOneToOne<T,
S>这是保证仅包含每个值和密钥中的一个（最多RefEquals反正），并且其可以使用任一键或值被搜索。任何人都知道一个，还是我应该自己实现？我不敢相信我是第一个需要这个的人…
这个问题的答案中有一个BiDictionary ，但它不是针对唯一元素的（并且也不实现RemoveByFirst（T
t）或RemoveBySecond（S s））。
谢谢！
回答：
好的，这是我的尝试（在乔恩的基础上-谢谢），在这里存档并可以改进：
/// <summary>/// This is a dictionary guaranteed to have only one of each value and key.
/// It may be searched either by TFirst or by TSecond, giving a unique answer because it is 1 to 1.
/// </summary>
/// <typeparam name="TFirst">The type of the "key"</typeparam>
/// <typeparam name="TSecond">The type of the "value"</typeparam>
public class BiDictionaryOneToOne<TFirst, TSecond>
{
IDictionary<TFirst, TSecond> firstToSecond = new Dictionary<TFirst, TSecond>();
IDictionary<TSecond, TFirst> secondToFirst = new Dictionary<TSecond, TFirst>();
#region Exception throwing methods
/// <summary>
/// Tries to add the pair to the dictionary.
/// Throws an exception if either element is already in the dictionary
/// </summary>
/// <param name="first"></param>
/// <param name="second"></param>
public void Add(TFirst first, TSecond second)
{
if (firstToSecond.ContainsKey(first) || secondToFirst.ContainsKey(second))
throw new ArgumentException("Duplicate first or second");
firstToSecond.Add(first, second);
secondToFirst.Add(second, first);
}
/// <summary>
/// Find the TSecond corresponding to the TFirst first
/// Throws an exception if first is not in the dictionary.
/// </summary>
/// <param name="first">the key to search for</param>
/// <returns>the value corresponding to first</returns>
public TSecond GetByFirst(TFirst first)
{
TSecond second;
if (!firstToSecond.TryGetValue(first, out second))
throw new ArgumentException("first");
return second;
}
/// <summary>
/// Find the TFirst corresponing to the Second second.
/// Throws an exception if second is not in the dictionary.
/// </summary>
/// <param name="second">the key to search for</param>
/// <returns>the value corresponding to second</returns>
public TFirst GetBySecond(TSecond second)
{
TFirst first;
if (!secondToFirst.TryGetValue(second, out first))
throw new ArgumentException("second");
return first;
}
/// <summary>
/// Remove the record containing first.
/// If first is not in the dictionary, throws an Exception.
/// </summary>
/// <param name="first">the key of the record to delete</param>
public void RemoveByFirst(TFirst first)
{
TSecond second;
if (!firstToSecond.TryGetValue(first, out second))
throw new ArgumentException("first");
firstToSecond.Remove(first);
secondToFirst.Remove(second);
}
/// <summary>
/// Remove the record containing second.
/// If second is not in the dictionary, throws an Exception.
/// </summary>
/// <param name="second">the key of the record to delete</param>
public void RemoveBySecond(TSecond second)
{
TFirst first;
if (!secondToFirst.TryGetValue(second, out first))
throw new ArgumentException("second");
secondToFirst.Remove(second);
firstToSecond.Remove(first);
}
#endregion
#region Try methods
/// <summary>
/// Tries to add the pair to the dictionary.
/// Returns false if either element is already in the dictionary
/// </summary>
/// <param name="first"></param>
/// <param name="second"></param>
/// <returns>true if successfully added, false if either element are already in the dictionary</returns>
public Boolean TryAdd(TFirst first, TSecond second)
{
if (firstToSecond.ContainsKey(first) || secondToFirst.ContainsKey(second))
return false;
firstToSecond.Add(first, second);
secondToFirst.Add(second, first);
return true;
}
/// <summary>
/// Find the TSecond corresponding to the TFirst first.
/// Returns false if first is not in the dictionary.
/// </summary>
/// <param name="first">the key to search for</param>
/// <param name="second">the corresponding value</param>
/// <returns>true if first is in the dictionary, false otherwise</returns>
public Boolean TryGetByFirst(TFirst first, out TSecond second)
{
return firstToSecond.TryGetValue(first, out second);
}
/// <summary>
/// Find the TFirst corresponding to the TSecond second.
/// Returns false if second is not in the dictionary.
/// </summary>
/// <param name="second">the key to search for</param>
/// <param name="first">the corresponding value</param>
/// <returns>true if second is in the dictionary, false otherwise</returns>
public Boolean TryGetBySecond(TSecond second, out TFirst first)
{
return secondToFirst.TryGetValue(second, out first);
}
/// <summary>
/// Remove the record containing first, if there is one.
/// </summary>
/// <param name="first"></param>
/// <returns> If first is not in the dictionary, returns false, otherwise true</returns>
public Boolean TryRemoveByFirst(TFirst first)
{
TSecond second;
if (!firstToSecond.TryGetValue(first, out second))
return false;
firstToSecond.Remove(first);
secondToFirst.Remove(second);
return true;
}
/// <summary>
/// Remove the record containing second, if there is one.
/// </summary>
/// <param name="second"></param>
/// <returns> If second is not in the dictionary, returns false, otherwise true</returns>
public Boolean TryRemoveBySecond(TSecond second)
{
TFirst first;
if (!secondToFirst.TryGetValue(second, out first))
return false;
secondToFirst.Remove(second);
firstToSecond.Remove(first);
return true;
}
#endregion
/// <summary>
/// The number of pairs stored in the dictionary
/// </summary>
public Int32 Count
{
get { return firstToSecond.Count; }
}
/// <summary>
/// Removes all items from the dictionary.
/// </summary>
public void Clear()
{
firstToSecond.Clear();
secondToFirst.Clear();
}
}
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