private int lastSortColumn = -1; // Track the last clicked column
/// <summary>
/// Sorts the ListView by the clicked column, automatically
/// reversing the sort order on subsequent clicks of the
/// same column.
/// </summary>
/// <param name="sender"></param>
/// <param name="e">Provides the index of the clicked column.</param>
private void lvFileList_ColumnClick(object sender, ColumnClickEventArgs e)
{
// Define a variable of the abstract (generic) comparer
ListViewItemComparer comparer = null;
// Create an instance of the specific comparer in the 'comparer'
// variable. Since each of the explicit comparer classes is
// derived from the abstract case class, polymorphism applies.
switch (e.Column)
{
// Line count columns
case 1:
case 2:
case 3:
comparer = new FileLinesComparer();
break;
// The file extension column
case 4:
comparer = new FileExtensionComparer();
break;
// All other columns sort by file name
default:
comparer = new FileNameComparer();
break;
}
// Set the sorting order
if (lastSortColumn == e.Column)
{
if (lvFileList.Sorting == SortOrder.Ascending)
{
lvFileList.Sorting = SortOrder.Descending;
}
else
{
lvFileList.Sorting = SortOrder.Ascending;
}
}
else
{
lvFileList.Sorting = SortOrder.Ascending;
}
lastSortColumn = e.Column;
// Send the comparer the list view and column being sorted
comparer.SortingList = lvFileList;
comparer.Column = e.Column;
// Attach the comparer to the list view and sort
lvFileList.ListViewItemSorter = comparer;
lvFileList.Sort();
}
private int lastSortColumn = -1; // Track the last clicked column
/// <summary>
/// Sorts the Vista_Api.ListView by the clicked column, automatically
/// reversing the sort order on subsequent clicks of the
/// same column.
/// </summary>
/// <param name="sender"></param>
/// <param name="e">Provides the index of the clicked column.</param>
private void lvFileList_ColumnClick(object sender, ColumnClickEventArgs e)
{
// Define a variable of the abstract (generic) comparer
ListViewItemComparer comparer = null;
// Create an instance of the specific comparer in the 'comparer'
// variable. Since each of the explicit comparer classes is
// derived from the abstract case class, polymorphism applies.
switch (e.Column)
{
// Line count columns
case 1:
case 2:
case 3:
comparer = new FileLinesComparer();
break;
// The file extension column
case 4:
comparer = new FileExtensionComparer();
break;
// All other columns sort by file name
default:
comparer = new FileNameComparer();
break;
}
// Set the sorting order
if (lastSortColumn == e.Column)
{
if (lvFileList.Sorting == SortOrder.Ascending)
{
lvFileList.Sorting = SortOrder.Descending;
}
else
{
lvFileList.Sorting = SortOrder.Ascending;
}
}
else
{
lvFileList.Sorting = SortOrder.Ascending;
}
lastSortColumn = e.Column;
// Send the comparer the list view and column being sorted
comparer.SortingList = lvFileList;
comparer.Column = e.Column;
// Attach the comparer to the list view and sort
lvFileList.ListViewItemSorter = comparer;
lvFileList.Sort();
}
