private void DataGridStandardSorting(object sender, DataGridSortingEventArgs e)
{
string sortPropertyName = SortHelpers.GetSortMemberPath(e.Column);
if (!string.IsNullOrEmpty(sortPropertyName))
{
// sorting is cleared when the previous state is Descending
if (e.Column.SortDirection.HasValue && e.Column.SortDirection.Value == ListSortDirection.Descending)
{
int index = SortHelpers.FindSortDescription(Items.SortDescriptions, sortPropertyName);
if (index != -1)
{
e.Column.SortDirection = null;
// remove the sort description
Items.SortDescriptions.RemoveAt(index);
Items.Refresh();
if ((Keyboard.Modifiers & ModifierKeys.Shift) != ModifierKeys.Shift)
{
// clear any other sort descriptions for the multisorting case
Items.SortDescriptions.Clear();
Items.Refresh();
}
// stop the default sort
e.Handled = true;
}
}
}
}
private void SortDescriptionsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// clear all the headers of sort order
foreach (DataGridColumn column in Columns)
{
string sortPath = SortHelpers.GetSortMemberPath(column);
if (sortPath != null)
{
column.Header = sortPath;
}
}
// add sort order
int sortIndex = 0;
foreach (SortDescription sortDesc in Items.SortDescriptions)
{
foreach (DataGridColumn column in Columns)
{
if (sortDesc.PropertyName == SortHelpers.GetSortMemberPath(column))
{
var sb = new StringBuilder();
sb.Append(sortDesc.PropertyName);
if (Items.SortDescriptions.Count > 1 && ShowSortOrder)
{
sb.Append(string.Format(" (Sort Order: {0})", sortIndex));
column.Header = sb.ToString();
}
}
}
sortIndex++;
}
}