webform gridview合并单元格

gridview合并单元格

由于项目要求，需要合并某些单元格，因此特意封装了如下帮助类：

 /// <summary>
    /// 合并单元格
    /// </summary>
    public class MergeCellHelper
    {
        /// <summary>
        /// 合并表头
        /// </summary>
        /// <param name="row">当前行</param>
        /// <param name="startColumn">开始列</param>
        /// <param name="endColumn">结束列</param>
        public static void MergeHeader(GridViewRow row, int startColumn, int endColumn)
        {
            for (int i = startColumn; i <= endColumn; i++)
            {
                if (i != startColumn)
                {
                    row.Cells[i].Visible = false;
                    continue;
                }
                row.Cells[startColumn].ColumnSpan = endColumn - startColumn + 1;
            }
        }

        /// <summary>
        /// 合并指定列的行
        /// </summary>
        /// <param name="gv">gridview</param>
        /// <param name="columns">指定的列：可以多列</param>
        public static void MergeRow(GridView gv, params int[] columns)
        {
            MergeRowByReferenceColumn(gv, 0, columns);
        }

        /// <summary>
        /// 合并指定列的行(参考列一定要合理，慎用)
        /// </summary>
        /// <param name="gv">gridview</param>
        ///  /// <param name="referenceColumn">参照列</param>
        /// <param name="columns">指定的列：可以多列</param>
        public static void MergeRowByReferenceColumn(GridView gv, int referenceColumn, params int[] columns)
        {
            for (int i = 0; i < columns.Length; i++)
            {
                var currentColumn = columns[i];
                int rowSpan = 1;
                for (int j = 0; j < gv.Rows.Count; j++)
                {
                    var currentRow = gv.Rows[j];
                    if (j < gv.Rows.Count - 1)
                    {
                        var nextRow = gv.Rows[j + 1];
                        if (currentRow.Cells[referenceColumn].Text == nextRow.Cells[referenceColumn].Text)
                        {
                            if (currentRow.Cells[currentColumn].Text == nextRow.Cells[currentColumn].Text)
                            {
                                rowSpan = rowSpan < 2 ? 2 : rowSpan + 1;
                                nextRow.Cells[currentColumn].Visible = false;
                            }
                            else
                            {
                                gv.Rows[j - rowSpan + 1].Cells[currentColumn].RowSpan = rowSpan;
                                rowSpan = 1;
                            }
                        }
                        else
                        {
                            gv.Rows[j - rowSpan + 1].Cells[currentColumn].RowSpan = rowSpan;
                            rowSpan = 1;
                        }
                    }
                    else
                    {
                        gv.Rows[j - rowSpan + 1].Cells[currentColumn].RowSpan = rowSpan;
                        rowSpan = 1;
                    }
                }
            }
        }


    }