public static void AddLast <T>([NotNull] this IList <T> list, [NotNull] T item)
{
if (list.IsReadOnly)
{
ExceptionThrower.ThrowArgumentReadOnlyCollectionException(nameof(list));
}
list.Insert(list.Count, item);
}
/// <summary>
/// Adds if not exists.
/// </summary>
/// <typeparam name="T">Generic type parameter.</typeparam>
/// <param name="list">The list.</param>
/// <param name="item">The value.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
/// <exception cref="ArgumentNullException">list - List cannot be null. or value - Value cannot be null.</exception>
/// <exception cref="ArgumentException">list - List cannot be null. or value - Value cannot be null.</exception>
/// <exception cref="ArgumentNullException">list - List cannot be read-only.</exception>
/// <exception cref="ArgumentException">list - List cannot be null. or value - Value cannot be null.</exception>
public static bool AddIfNotExists <T>([NotNull] this ICollection <T> list, [NotNull] T item)
{
if (list.IsReadOnly)
{
ExceptionThrower.ThrowArgumentReadOnlyCollectionException(nameof(list));
}
if (list.Contains(item))
{
return(false);
}
list.Add(item);
return(true);
}