public class CustomComparer :
IComparer<object>, Syncfusion.Data.ISortDirection { public CustomComparer() { }
public int Compare(object x, object y) {
if (x is Group
groupvalueX && y is Group groupvalueY)
{
DateTime dateTimeX =
DateTime.ParseExact(groupvalueX.Key.ToString(), "M/d/yyyy", System.Globalization.CultureInfo.InvariantCulture);
DateTime dateTimeY = DateTime.ParseExact(groupvalueY.Key.ToString(), "M/d/yyyy", System.Globalization.CultureInfo.InvariantCulture);
if
(_SortDirection == System.ComponentModel.ListSortDirection.Ascending)
return dateTimeX.CompareTo(dateTimeY);
else
return dateTimeY.CompareTo(dateTimeX);
}
else
{
var valueX = (x as
OrderInfo).OrderDate;
var valueY = (y as
OrderInfo).OrderDate;
if
(_SortDirection == System.ComponentModel.ListSortDirection.Ascending)
return
valueX.CompareTo(valueY);
else
return
valueY.CompareTo(valueX);
}
} private
System.ComponentModel.ListSortDirection _SortDirection;
/// <summary> /// Gets or sets
the property that denotes the sort direction. /// </summary> /// <remarks> /// SortDirection
gets updated only when sorting the groups. For other cases, SortDirection is
always ascending. /// </remarks> public
System.ComponentModel.ListSortDirection SortDirection {
get { return
_SortDirection; }
set {
_SortDirection = value; }
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