C#如何从DataGridView控件数据，转成获取DataTable

  public DataTable GetDgvToTable(DataGridView dgv)
        {
            DataTable dt = new DataTable();
            for ( int count = 0 ; count < dgv.Columns.Count; count ++ )
            {
                DataColumn dc = new DataColumn(dgv.Columns[count].Name.ToString());
                dt.Columns.Add(dc);
            }
            for ( int count = 0 ; count < dgv.Rows.Count; count ++ )
            {
                DataRow dr = dt.NewRow();
                for ( int countsub = 0 ; countsub < dgv.Columns.Count; countsub ++ )
                {
                    dr[countsub] = Convert.ToString(dgv.Rows[count].Cells[countsub].Value);
                }
                dt.Rows.Add(dr);
            }
            return dt;
        }