/// <summary>
/// Assumption: grouped items have the same row and their ordered difference is 1
/// </summary>
/// <param name="grouped"></param>
/// <param name="index"></param>
/// <param name="count"></param>
/// <returns>items to be removed</returns>
public static List <T> GetRemoved(GroupedItems <T> grouped, int index, int count)
{
if (grouped.Count == 1)
{
return(new List <T>(grouped.Lines));
}
else
{
if ((grouped.Count < index + count) || count <= 0 || index < 0)
{
throw new Exception("error");
}
if (count == grouped.Count)
{
return(new List <T>(grouped.Lines));
}
else
{
return(grouped.Lines.GetRange(index, count));
}
}
}