DataGridView选中行按从上到下或从下到上排序

    /// <summary>
    /// 从上到下排列选择行
    /// </summary>
    /// <param name="dgv"></param>
    /// <returns></returns>
    public static List<DataGridViewRow> SortedUpDownSelectedRows(this DataGridView dgv)
    {
      List<DataGridViewRow> lstDgvr = new List<DataGridViewRow>();
      if (dgv.SelectedRows.Count == 0)
      {
        "请先选择属性定义行！".showAlert();
        return lstDgvr;
      }
      lstDgvr = dgv.SelectedRows.Cast<DataGridViewRow>().OrderBy(p => p.Index).Select(p => p).ToList(); ;
      return lstDgvr;
    }
    /// <summary>
    /// 从下到上排列选择行
    /// </summary>
    /// <param name="dgv"></param>
    /// <returns></returns>
    public static List<DataGridViewRow> SortedDownUpSelectedRows(this DataGridView dgv)
    {
      List<DataGridViewRow> lstDgvr = new List<DataGridViewRow>();
      if (dgv.SelectedRows.Count == 0)
      {
        "请先选择属性定义行！".showAlert();
        return lstDgvr;
      }
      lstDgvr = dgv.SelectedRows.Cast<DataGridViewRow>().OrderByDescending(p => p.Index).Select(p => p).ToList(); ;
      return lstDgvr;
    }