/// <summary>
/// Adds the specified item to the dictionary.
/// </summary>
/// <typeparam name="TKey">The key of the element to add.</typeparam>
/// <typeparam name="TValue">The value of the element to add. The value can be null for reference types.</typeparam>
/// <param name="dictionary">The Dictionary to add the item too.</param>
/// <param name="item">The <see cref="T:KeyValuePair"/> item to be added.</param>
public static void Add <TKey, TValue>(this IDictionary <TKey, TValue> dictionary, KeyValuePair <TKey, TValue> item)
{
if (dictionary.IsNull())
{
throw new ArgumentNullException("dictionary");
}
dictionary.Add(item.Key, item.Value);
}