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Gets information about all groups in the row direction.
Returns the top-level row groups in the worksheet outline. Nested row groups can be accessed from the child groups of each returned IGroupInfo.
List<IGroupInfo> RowGroupInfo { get; }
ReadOnly Property RowGroupInfo As List(Of IGroupInfo)
worksheet.Range["1:4"].Group();
worksheet.Range["2:3"].Group();
List<IGroupInfo> groups = worksheet.Outline.RowGroupInfo;
IGroupInfo group = groups[0];
int level = group.Level;