[closedXML]手動換行

 var ws2 = wb.Worksheets.Add(title + "列表與紀錄");

 mRStr = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
 mRStr += "\r\n";
 mRStr  +="bbbbbbbbbbbbbbbbbbb";

  ws2.Cell(ws2_r_idx, ws2_c_idx).Value = mRStr;
  ws2.Cell(ws2_r_idx, ws2_c_idx).Style.Alignment.WrapText = true;


  ws2.Rows().AdjustToContents();
  ws2.Columns().AdjustToContents();

ref:
http://byeblou.blogspot.com/2018/11/c-excel-closedxml.html