/// <summary>
/// Adds the key/value pair to the node. If the key already exists in the
/// list an ArgumentException will be thrown
/// </summary>
/// <param name="key">The key of the item being added</param>
/// <param name="value">The value of the item being added</param>
public void Add(TKey key, TValue value)
{
// lazy init the linked list
if (_items == null)
{
_items = new LinkedList <HashTableNodePair <TKey, TValue> >();
}
else
{
// Multiple items might collide and exist in this list - but each
// key should only be in the list once.
foreach (HashTableNodePair <TKey, TValue> pair in _items)
{
if (pair.Key.Equals(key))
{
throw new ArgumentException("The collection already contains the key");
}
}
}
// if we made it this far - add the item
_items.AddHead(new HashTableNodePair <TKey, TValue>(key, value));
}