/// <summary>
/// Sorts the elements of a sequence in descending order according to a key.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source"/>.</typeparam>
/// <typeparam name="TKey">The type of the key returned by <paramref name="keySelector"/>.</typeparam>
/// <param name="source">A sequence of values to order.</param>
/// <param name="keySelector">A function to extract a key from an element.</param>
/// <param name="dependencyAnalysisMode">The dependency analysis mode.</param>
/// <returns>
/// An <see cref="T:System.Linq.IOrderedEnumerable`1"/> whose elements are sorted in descending order according to a key.
/// </returns>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="source"/> or <paramref name="keySelector"/> is null.</exception>
public static IOrderedBindableCollection <TSource> OrderByDescending <TSource, TKey>(this IBindableCollection <TSource> source, Expression <Func <TSource, TKey> > keySelector, DependencyDiscovery dependencyAnalysisMode) where TSource : class
{
return(source.OrderByDescending(keySelector, null, dependencyAnalysisMode));
}
/// <summary>
/// Sorts the list based on a <see cref="T:System.ComponentModel.PropertyDescriptor"/> and a <see cref="T:System.ComponentModel.ListSortDirection"/>.
/// </summary>
/// <param name="property">The <see cref="T:System.ComponentModel.PropertyDescriptor"/> to sort by.</param>
/// <param name="direction">One of the <see cref="T:System.ComponentModel.ListSortDirection"/> values.</param>
/// <exception cref="T:System.NotSupportedException">
/// <see cref="P:System.ComponentModel.IBindingList.SupportsSorting"/> is false. </exception>
public void ApplySort(PropertyDescriptor property, ListSortDirection direction)
{
if (property == _sortProperty && direction == _sortDirection)
{
return;
}
if (IsSorted)
{
UnwireInterceptor();
}
_sortProperty = property;
_sortDirection = direction;
Expression <Func <TElement, object> > selector = item => KeySelector(item);
var q = ListSortDirection.Ascending == _sortDirection?_originalSource.OrderBy(selector) : _originalSource.OrderByDescending(selector);
WireInterceptor(q.DependsOn(_sortProperty.Name));
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
