namespace CommonClassLibrary
{
    publicclass GroupedGridView : GridView
    {  
        //设置合并的列数
        publicint GroupedDepth
        {
            get
            {
                object val =this.ViewState["GroupedDepth"];
                if (null== val)
                {
                    return0;
                }

                return (int)val;
            }
            set
            {
                if (value <0)
                    thrownew ArgumentOutOfRangeException("value", "value must be greater than or equal to zero");

                this.ViewState["GroupedDepth"] = value;
            }
        }

        protectedoverridevoid OnDataBound(EventArgs e)
        {
            base.OnDataBound(e);

            this.SpanCellsRecursive(0, 0, this.Rows.Count);
        }

        privatevoid SpanCellsRecursive(int columnIndex, int startRowIndex, int endRowIndex)
        {
            if (columnIndex >=this.GroupedDepth || columnIndex >=this.Columns.Count)
                return;

            TableCell groupStartCell =null;
            int groupStartRowIndex = startRowIndex;

            for (int i = startRowIndex; i < endRowIndex; i++)
            {
                TableCell currentCell =this.Rows[i].Cells[columnIndex];

                bool isNewGroup = (null== groupStartCell) || (0!= String.CompareOrdinal(currentCell.Text, groupStartCell.Text));

                if (isNewGroup)
                {
                    if (null!= groupStartCell)
                    {
                        SpanCellsRecursive(columnIndex +1, groupStartRowIndex, i);
                    }

                    groupStartCell = currentCell;
                    groupStartCell.RowSpan =1;
                    groupStartRowIndex = i;
                }
                else
                {
                    currentCell.Visible =false;
                    groupStartCell.RowSpan +=1;
                }
            }

            SpanCellsRecursive(columnIndex +1, groupStartRowIndex, endRowIndex);
        }
    }
}