/// <summary>
/// Converts and groups the values of the specified sequence according to the settings of the specified parameters.
/// </summary>
/// <param name="sequence">Sequence of items.</param>
/// <param name="parameters">Parameters for the grouping operation.</param>
/// <returns>Converted and grouped sequence.</returns>
private IEnumerable<object> ConvertAndGroupSequence(IEnumerable<object> sequence, GroupingItemsControlConverterParameters parameters)
{
// Validate parameters
var groupSelector = parameters.GroupSelector.GetGroupSelector();
if (null == groupSelector)
{
throw new NotSupportedException("IGroupingItemsControlConverterSelector.GetGroupSelector must return a non-null value.");
}
// Do the grouping and ordering
var groupedOrderedSequence = sequence.GroupBy(groupSelector).OrderBy(g => g.Key);
// Return the wrapped results
foreach (var group in groupedOrderedSequence)
{
yield return new ContentControl { Content = group.Key, ContentTemplate = parameters.GroupHeaderTemplate };
foreach (var item in group)
{
yield return new ContentControl { Content = item, ContentTemplate = parameters.ItemTemplate };
}
}
}
/// <summary>
/// Converts and groups the values of the specified sequence according to the settings of the specified parameters.
/// </summary>
/// <param name="sequence">Sequence of items.</param>
/// <param name="parameters">Parameters for the grouping operation.</param>
/// <returns>Converted and grouped sequence.</returns>
private IEnumerable <object> ConvertAndGroupSequence(IEnumerable <object> sequence, GroupingItemsControlConverterParameters parameters)
{
// Validate parameters
var groupSelector = ((IGroupingItemsControlConverterSelector)(parameters.GroupSelector)).GetGroupSelector();
if (null == groupSelector)
{
throw new NotSupportedException("IGroupingItemsControlConverterSelector.GetGroupSelector must return a non-null value.");
}
// Do the grouping and ordering
var groupedOrderedSequence = sequence.GroupBy(groupSelector).OrderBy(g => g.Key);
// Return the wrapped results
foreach (var group in groupedOrderedSequence)
{
yield return(new ContentControl {
Content = group.Key, ContentTemplate = parameters.GroupHeaderTemplate
});
foreach (var item in group)
{
yield return(new ContentControl {
Content = item, ContentTemplate = parameters.ItemTemplate
});
}
}
}
