internal object[] GetItemPropertyDistinctValues(DataGridItemPropertyBase dataGridItemProperty)
{
if (m_queryableSource == null)
{
return(new object[0]);
}
IQueryable distinctQueryable = m_queryableSource.GetSubGroupsAndCountsQueryable(dataGridItemProperty.Name, false, ListSortDirection.Ascending);
List <object> distinctValuesAndCounts = new List <object>();
try
{
System.Collections.IEnumerator enumerator = distinctQueryable.GetEnumerator();
while (enumerator.MoveNext())
{
QueryableExtensions.IQueryableGroupNameCountPair current = enumerator.Current as QueryableExtensions.IQueryableGroupNameCountPair;
if (current != null)
{
distinctValuesAndCounts.Add(current.GroupName);
}
}
return(distinctValuesAndCounts.ToArray());
}
catch
{
// TimeOut exception on the connection or other.
return(new object[0]);
}
}
internal override ObservableCollection <object> QuerySubCollectionViewGroupList(GroupDescription childGroupBy, int nextLevel, bool nextLevelIsBottom)
{
string childGroupByPropertyName = DataGridCollectionViewBase.GetPropertyNameFromGroupDescription(childGroupBy);
if (String.IsNullOrEmpty(childGroupByPropertyName))
{
throw new NotSupportedException("Custom groups are not supported when using a DataGridVirtualizingQueryableCollectionView.");
}
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
bool sortGroupBy = false;
ListSortDirection groupByDirection = ListSortDirection.Ascending;
foreach (SortDescription sortDescription in collectionView.SortDescriptions)
{
if (sortDescription.PropertyName == childGroupByPropertyName)
{
sortGroupBy = true;
groupByDirection = sortDescription.Direction;
break;
}
}
IQueryable groupsAndCountsQueryable = this.Queryable.GetSubGroupsAndCountsQueryable(childGroupByPropertyName, sortGroupBy, groupByDirection);
List <QueryableExtensions.IQueryableGroupNameCountPair> distinctValuesAndCounts = new List <QueryableExtensions.IQueryableGroupNameCountPair>();
try
{
System.Collections.IEnumerator enumerator = groupsAndCountsQueryable.GetEnumerator();
while (enumerator.MoveNext())
{
QueryableExtensions.IQueryableGroupNameCountPair current = enumerator.Current as QueryableExtensions.IQueryableGroupNameCountPair;
if (current != null)
{
distinctValuesAndCounts.Add(current);
}
}
}
catch
{
// TimeOut exception on the connection or other.
distinctValuesAndCounts.Clear();
}
// If we are not the bottom level, we should have subgroups.
// However, if the connection timed out and the catch statement set the coundAndDistinctValues to an empty array,
// then we shouldn't add anything. We cannot reset on the spot since we might already be resetting.
// Create the collection of sub CollectionViewGroups
ObservableCollection <object> subCollectionViewGroupList = new ObservableCollection <object>();
int runningCount = this.StartGlobalIndex;
int distinctValuesCount = distinctValuesAndCounts.Count;
for (int i = 0; i < distinctValuesCount; i++)
{
QueryableExtensions.IQueryableGroupNameCountPair queryableGroupNameCountPair = distinctValuesAndCounts[i];
subCollectionViewGroupList.Add(
new DataGridVirtualizingQueryableCollectionViewGroup(queryableGroupNameCountPair.GroupName, queryableGroupNameCountPair.Count, runningCount, this, nextLevel, nextLevelIsBottom));
runningCount += queryableGroupNameCountPair.Count;
}
return(subCollectionViewGroupList);
}
