///   合并GridView列中相同的行

    ///

    ///   GridView对象

    ///   需要合并的列

    public static void GroupRows(GridView GridView1, int cellNum)

    {

        int i = , rowSpanNum = ;

        while (i < GridView1.Rows.Count - )

        {

            GridViewRow gvr = GridView1.Rows[i];

            for (++i; i < GridView1.Rows.Count; i++)

            {

                GridViewRow gvrNext = GridView1.Rows[i];

                if (gvr.Cells[cellNum].Text == gvrNext.Cells[cellNum].Text)

                {

                    gvrNext.Cells[cellNum].Visible = false;

                    rowSpanNum++;

                }

                else

                {

                    gvr.Cells[cellNum].RowSpan = rowSpanNum;

                    rowSpanNum = ;

                    break;

                }

                if (i == GridView1.Rows.Count - )

                {

                    gvr.Cells[cellNum].RowSpan = rowSpanNum;

                }

            }

        }

    }

    ///

    ///   根据条件列合并GridView列中相同的行

    ///

    ///   GridView对象

    ///   需要合并的列

    ///   ///   条件列(根据某条件列还合并)

    public static void GroupRows(GridView GridView1, int cellNum, int cellNum2)

    {

        int i = , rowSpanNum = ;

        while (i < GridView1.Rows.Count - )

        {

            GridViewRow gvr = GridView1.Rows[i];

            for (++i; i < GridView1.Rows.Count; i++)

            {

                GridViewRow gvrNext = GridView1.Rows[i];

                if (gvr.Cells[cellNum].Text + gvr.Cells[cellNum2].Text == gvrNext.Cells[cellNum].Text + gvrNext.Cells[cellNum2].Text)

                {

                    gvrNext.Cells[cellNum].Visible = false;

                    rowSpanNum++;

                }

                else

                {

                    gvr.Cells[cellNum].RowSpan = rowSpanNum;

                    rowSpanNum = ;

                    break;

                }

                if (i == GridView1.Rows.Count - )

                {

                    gvr.Cells[cellNum].RowSpan = rowSpanNum;

                }

            }

        }

    } 

第二个方法只是在第一个方法的修改了一点点, 在判断单元格的时候，加上了一个条件列：

if (gvr.Cells[cellNum].Text + gvr.Cells[cellNum2].Text == gvrNext.Cells[cellNum].Text + gvrNext.Cells[cellNum2].Text)。当然，第二个方法还可以扩展，根据多个列的条件来合并。