GridView跨行合併單元格

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->/// <summary>
///GridViewCellCombine 的摘要說明
/// </summary>
public class GridViewCellCombine
{
    /// <summary>
    /// 目標GridView
    /// </summary>
    GridView _gridView;

    /// <summary>
    /// 上一行單元格集
    /// </summary>
    TableCell[] _cells;

    /// <summary>
    /// 要合併單元格的列索引集合
    /// </summary>
    int[] _colIndexes;

    /// <summary>
    /// 單元格合併相等判斷條件
    /// </summary>
    ICellEquality[] _colCellEquality;

    /// <summary>
    /// GridView單元格合併輔助類
    /// </summary>
    /// <param name="gridView">目標GridView</param>
    /// <param name="colIndexes">要合併的列的索引號</param>
    public GridViewCellCombine(GridView gridView, int[] colIndexes, ICellEquality[] colCellEquality)
    {
        if (gridView == null)
            throw new Exception("GridView不能爲空");

        this._gridView = gridView;
        _gridView.RowDataBound += new GridViewRowEventHandler(GridViewRowDataBound);

        if (colIndexes != null && colCellEquality != null)//在指定了要合併單元格列及單元格比較器時，列數和比較器數應該一樣。
        {
            if (colIndexes.Length != colCellEquality.Length)
            {
                throw new Exception("請爲要合併單元格的每一列都添加單元格比較類");
            }
        }

        if (colIndexes != null)
        {
            _colIndexes = colIndexes;
            _cells = new TableCell[colIndexes.Length];
        }
        else
        {
            _cells = new TableCell[this._gridView.Columns.Count];
            _colIndexes = Enumerable.Range(0, this._gridView.Columns.Count).ToArray();
        }

        if (colCellEquality != null)
        {
            _colCellEquality = colCellEquality;
        }
        else
            _colCellEquality = new ICellEquality[_cells.Length];

    }

    /// <summary>
    /// GridView行綁定事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void GridViewRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (_colIndexes != null)
        {
            for (int i = 0; i < _colIndexes.Length; i++)
            {
                //如果上一行該列單元格爲空，則從當前行的單元格之後進行比較
                if (_cells[i] == null)
                {
                    _cells[i] = e.Row.Cells[_colIndexes[i]];//把當前單元格引用暫存用於下一行時比較
                    continue;
                }

                //如果當前行第_colIndexes[i]列單元格與上一行單元格相等,合併單元格
                if (CellEquals(_cells[i], e.Row.Cells[_colIndexes[i]], _colCellEquality[i]))
                {
                    _cells[i].RowSpan++;
                    if (_cells[i].RowSpan == 1)//RowSpan屬性爲0 1時都表示不合並
                        _cells[i].RowSpan++;

                    e.Row.Cells[_colIndexes[i]].Visible = false;
                }
                else
                {
                    _cells[i] = e.Row.Cells[_colIndexes[i]];
                }
            }
        }
    }

    /// <summary>
    /// 獲取指定位置的單元格
    /// </summary>
    /// <param name="rowIndex"></param>
    /// <param name="colIndex"></param>
    /// <returns></returns>
    private TableCell GetCell(int rowIndex, int colIndex)
    {
        return this._gridView.Rows[rowIndex].Cells[colIndex];
    }

    /// <summary>
    /// 單元格相等比較
    /// </summary>
    /// <param name="cell1">cell1</param>
    /// <param name="cell2">cell2</param>
    /// <param name="equality">相等比較器</param>
    /// <returns>返回是否相等</returns>
    private bool CellEquals(TableCell cell1, TableCell cell2, ICellEquality equality)
    {
        bool result = false;
        if (equality == null)//如果比較器爲空採用默認比較器
        {
            result = DefaultCellEquality.Entity.CellEquals(cell1, cell2);
        }
        else
        {
            result = equality.CellEquals(cell1, cell2);
        }

        return result;
    }

    /// <summary>
    /// 單元格默認比較類
    /// </summary>
    class DefaultCellEquality : ICellEquality
    {
        /// <summary>
        /// 默認的單元格相等比較器，用單元格內的文字進行比較
        /// </summary>
        public static DefaultCellEquality Entity = new DefaultCellEquality();

        #region ICellEquality 成員

        /// <summary>
        /// 比較方法
        /// </summary>
        /// <param name="cell1">cell1</param>
        /// <param name="cell2">cell2</param>
        /// <returns>是否相等</returns>
        public bool CellEquals(TableCell cell1, TableCell cell2)
        {
            if (cell1 == null || cell2 == null)
                return false;
            return cell1.Text.Equals(cell2.Text);//根據單元格內容比較
        }

        #endregion
    }
}

/// <summary>
/// 單元格相等比較器
/// </summary>
public interface ICellEquality
{
    /// <summary>
    /// 比較兩個單元格是否相等
    /// </summary>
    /// <param name="cell1">單元格1</param>
    /// <param name="cell2">單元格2</param>
    /// <returns>返回是否相等</returns>
    bool CellEquals(TableCell cell1, TableCell cell2);
}