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Clears the sort field list.
Removes all sort fields from the sort condition list returned by SortFields. After this method is called, the sort no longer has any configured sort conditions until new ISortField entries are added.
void Clear()
Sub Clear()
worksheet.Range["A1:A4"].Value = new object[,] {{5}, {3}, {4}, {2}};
ISort sort = worksheet.Sort;
sort.Range = worksheet.Range["A1:A4"];
sort.SortFields.Add(new ValueSortField(worksheet.Range["A1:A4"]));
sort.SortFields.Clear();