DataGridView实现点击列头升序和降序排序

private void FrmMain_Load(object sender, EventArgs e)
{
     foreach (DataGridViewColumn column in this.dgv_Users.Columns)
    {
          //设置自动排序
          column.SortMode = DataGridViewColumnSortMode.Automatic;
    }
}

private void dgv_Users_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{          
     DataGridView dgv = sender as DataGridView;
     if (dgv.Columns[e.ColumnIndex].SortMode == DataGridViewColumnSortMode.Programmatic)
     {
         string columnBindingName = dgv.Columns[e.ColumnIndex].DataPropertyName;
         switch (dgv.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection)
         {
            case System.Windows.Forms.SortOrder.None:
            case System.Windows.Forms.SortOrder.Ascending:
                   CustomSort(columnBindingName, "desc");
                   dgv.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection = System.Windows.Forms.SortOrder.Descending;
                   break;
            case System.Windows.Forms.SortOrder.Descending:
                   CustomSort(columnBindingName, "asc");
                   dgv.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection = System.Windows.Forms.SortOrder.Ascending;
                   break;
            }
       }          
}

/// <summary>
/// 自定义排序
/// </summary>
/// <param name="columnName">绑定的字段名</param>
/// <param name="sortMode">排序方式 asc 升序 desc 降序</param>
private void CustomSort(string columnBindingName, string sortMode)
{
      DataTable dt = this.dgv_Users.DataSource as DataTable;
      DataView dv = dt.DefaultView;
      dv.Sort = columnBindingName + " " + sortMode;
      this.dgv_Users.DataSource = dv.ToTable();
      this.dgv_Users.Refresh();
}