/// <summary>
/// Tests if the IDictionary is empty.
/// </summary>
/// <typeparam name="TKey">The type of the key of
/// the IDictionary.</typeparam>
/// <typeparam name="TValue">The type of the values
/// of the IDictionary.</typeparam>
/// <param name="collection">The collection to test.</param>
/// <returns>True if the collection is empty.</returns>
public static bool IsEmpty <TKey, TValue>(this IDictionary <TKey, TValue> collection)
{
collection.ExceptionIfNull("The collection cannot be null.", "collection");
return(collection.Count == 0);
}