如何在每行网格视图asp.net中合并具有相同值的列

// GridView的RowDataBound事件
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        int rowIndex = e.Row.RowIndex;
        if (rowIndex > 0)
        {
            GridViewRow previousRow = GridView1.Rows[rowIndex - 1];
            Label currentLabel = (Label)e.Row.FindControl("Label1");
            Label previousLabel = (Label)previousRow.FindControl("Label1");

            if (currentLabel.Text == previousLabel.Text)
            {
                currentLabel.Visible = false;
                int previousRowSpan = GetRowSpan(previousRow, "Label1");
                SetRowSpan(previousRow, "Label1", previousRowSpan + 1);
            }
        }
    }
}

// GridView的RowCreated事件
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        int rowIndex = e.Row.RowIndex;
        if (rowIndex > 0)
        {
            GridViewRow previousRow = GridView1.Rows[rowIndex - 1];
            Label currentLabel = (Label)e.Row.FindControl("Label1");
            Label previousLabel = (Label)previousRow.FindControl("Label1");

            if (currentLabel.Text == previousLabel.Text)
            {
                int previousRowSpan = GetRowSpan(previousRow, "Label1");
                SetRowSpan(previousRow, "Label1", previousRowSpan + 1);
                currentLabel.Visible = false;
            }
        }
    }
}

// 获取指定单元格的RowSpan属性值
private int GetRowSpan(GridViewRow row, string columnName)
{
    int rowSpan = 1;
    int columnIndex = GetColumnIndex(row, columnName);

    if (columnIndex >= 0)
    {
        TableCell cell = row.Cells[columnIndex];
        if (cell.Attributes["RowSpan"] != null)
        {
            rowSpan = Convert.ToInt32(cell.Attributes["RowSpan"]);
        }
    }

    return rowSpan;
}

// 设置指定单元格的RowSpan属性值
private void SetRowSpan(GridViewRow row, string columnName, int rowSpan)
{
    int columnIndex = GetColumnIndex(row, columnName);

    if (columnIndex >= 0)
    {
        TableCell cell = row.Cells[columnIndex];
        cell.Attributes.Add("RowSpan", rowSpan.ToString());
    }
}

// 获取指定列的索引
private int GetColumnIndex(GridViewRow row, string columnName)
{
    int columnIndex = -1;

    for (int i = 0; i < row.Cells.Count; i++)
    {
        if (row.Cells[i].Text == columnName)
        {
            columnIndex = i;
            break;
        }
    }

    return columnIndex;
}