GridView合并单元格（所有内容相同的单元格）

 源码：

1、

public static void GroupRow(GridView gridView)
    {
        for (int rowIndex = gridView.Rows.Count - 2; rowIndex >= 0; rowIndex--)
        {
            GridViewRow row = gridView.Rows[rowIndex];
            GridViewRow previousRow = gridView.Rows[rowIndex + 1];

            for (int i = 0; i < row.Cells.Count; i++)
            {
                if (row.Cells[i].Text == previousRow.Cells[i].Text)
                {
                    row.Cells[i].RowSpan = previousRow.Cells[i].RowSpan < 2 ? 2 :
                                           previousRow.Cells[i].RowSpan + 1;
                    previousRow.Cells[i].Visible = false;
                }
            }
        }
    }

2、

//cellNum 表示需要合并的列，索引从0开始   
public static void GroupRows(GridView GridView1, int cellNum)
    {
        int i = 0, rowSpanNum = 1;
        while (i < GridView1.Rows.Count - 1)
        {
            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 = 1;
                    break;
                }

                if (i == GridView1.Rows.Count - 1)
                {
                    gvr.Cells[cellNum].RowSpan = rowSpanNum;
                }
            }
        }
    } 

3、

    private DataTable HBTable(DataTable dt1, DataTable dt2)
    {
        DataTable newDataTable = dt1.Clone();

        object[] obj = new object[newDataTable.Columns.Count];
        for (int i = 0; i < dt1.Rows.Count; i++)
        {
            dt1.Rows[i].ItemArray.CopyTo(obj, 0);
            newDataTable.Rows.Add(obj);
        }

        for (int i = 0; i < dt2.Rows.Count; i++)
        {
            dt2.Rows[i].ItemArray.CopyTo(obj, 0);
            newDataTable.Rows.Add(obj);
        }
        return newDataTable;


    } 

4、

   protected void Unite(GridView gv)
    {
        int i;
        string LastType1;
        int LastCell;
        if (gv.Rows.Count > 0)
        {
            for (int j = 0; j < 10; j++)
            {
                LastType1 = gv.Rows[0].Cells[j].Text;
                gv.Rows[0].Cells[j].RowSpan = 1;
                LastCell = 0;

                if (j != 3 && j != 4)
                {
                    for (i = 1; i < gv.Rows.Count; i++)
                    {
                        if (gv.Rows[i].Cells[j].Text == LastType1)
                        {
                            gv.Rows[i].Cells[j].Visible = false;
                            gv.Rows[LastCell].Cells[j].RowSpan++;
                        }
                        else
                        {
                            LastType1 = gv.Rows[i].Cells[j].Text;
                            LastCell = i;
                            gv.Rows[i].Cells[j].RowSpan = 1;
                        }
                    }
                }
            }
        }
    }

5、

  public DataSet MergeTable(DataTable tab1, DataTable tab2)
        {
            DataTable table = new DataTable();
            if (tab1.Rows.Count != 0 && tab2.Rows.Count != 0)
            {
                DataColumn[] columns = new DataColumn[tab1.Columns.Count + tab2.Columns.Count];
                tab1.Columns.CopyTo(columns, 0);
                tab2.Columns.CopyTo(columns, tab1.Columns.Count);
                foreach (DataColumn column in columns)
                {
                    table.Columns.Add(column.ColumnName);
                }
                int count = tab1.Rows.Count > tab2.Rows.Count ? tab1.Rows.Count : tab2.Rows.Count;
                for (int i = 0; i < count; i++)
                {
                    if (tab1.Rows.Count <= i)
                    {
                        break;
                    }
                    DataRow row = table.NewRow();
                    for (int m = 0; m < tab1.Columns.Count; m++)
                    {
                        DataRow item = tab1.Rows[i];
                        row[tab1.Columns[m].ToString()] = item[tab1.Columns[m].ToString()];
                    }
                    for (int n = 0; n < tab2.Columns.Count; n++)
                    {
                        if (tab2.Rows.Count <= i)
                        {
                            break;
                        }
                        DataRow item = tab2.Rows[i];
                        row[tab2.Columns[n].ToString()] = item[tab2.Columns[n].ToString()];
                    }
                    table.Rows.Add(row);
                }
            }
            else
            {
                table = tab1.Rows.Count == 0 ? tab2.Copy() : tab1.Copy();
            }
            DataSet ds = new DataSet();
            ds.Tables.Add(table);
            return ds;
        }