public BiDictionary(Dictionary <T1, T2> keysToValue)
{
KeyToValue = keysToValue;
foreach (var keyValue in keysToValue)
{
ValueToKey.Add(keyValue.Value, keyValue.Key);
}
}
public void Add(T1 key, T2 value)
{
KeyToValue.Add(key, value);
ValueToKey.Add(value, key);
}