Sorted Ascending
Sorted Descending
Introduction
The code descried here enables you to sort ListView
Groups, ascending or descending.
Background
I needed a "quick and dirty" solution to sort my Groups in a ListView
. So I came up with this very very simple solution.
Using the code
Just cast your ListView
into my listview wrapper and call SortGroup(bool)
.
Like this where listView1
is your own ListView
to be sorted:
((ListViewGroupSorter)listView1).SortGroups(true);
((ListViewGroupSorter)listView1).SortGroups(false);
The ListViewGroupHeaderSorter Class
public class ListViewGroupHeaderSorter : IComparer<ListViewGroup>
{
private bool _ascending = true;
public ListViewGroupHeaderSorter(bool ascending)
{
_ascending = ascending;
}
#region IComparer<ListViewGroup> Members
public int Compare(ListViewGroup x, ListViewGroup y)
{
if (_ascending)
return string.Compare(((ListViewGroup)x).Header, ((ListViewGroup)y).Header);
else
return string.Compare(((ListViewGroup)y).Header, ((ListViewGroup)x).Header);
}
#endregion
}
The ListViewGroupHeaderSorter Class
public class ListViewGroupSorter
{
internal ListView _listview;
public static bool operator ==(ListView listview, ListViewGroupSorter sorter)
{
return listview == sorter._listview;
}
public static bool operator !=(ListView listview, ListViewGroupSorter sorter)
{
return listview != sorter._listview;
}
public static implicit operator ListView(ListViewGroupSorter sorter)
{
return sorter._listview;
}
public static implicit operator ListViewGroupSorter(ListView listview)
{
return new ListViewGroupSorter(listview);
}
internal ListViewGroupSorter(ListView listview)
{
_listview = listview;
}
public void SortGroups(bool ascending)
{
_listview.BeginUpdate();
List<listviewgroup> lvgs = new List<listviewgroup>();
foreach (ListViewGroup lvg in _listview.Groups)
lvgs.Add(lvg);
_listview.Groups.Clear();
lvgs.Sort(new ListViewGroupHeaderSorter(ascending));
_listview.Groups.AddRange(lvgs.ToArray());
_listview.EndUpdate();
}
#region overridden methods
public override bool Equals(object obj)
{
return _listview.Equals(obj);
}
public override int GetHashCode()
{
return _listview.GetHashCode();
}
public override string ToString()
{
return _listview.ToString();
}
#endregion
}
History
- 17. Aug. 2009 - First version posted.