/// <summary>
/// Gets state data stored with the specified key.
/// </summary>
/// <typeparam name="T">The type of data to retrieve.</typeparam>
/// <param name="key">An object representing the unique key with which the data was stored.</param>
/// <returns>An instance of <typeparamref name="T"/> or null if not found.</returns>
public T Get <T>(object key)
{
return(_state.Get <T>(key));
}