TRANSFORM Pivot usin Linq

Question

我有以下格式的記錄，我想使用linq進行數據透視，請幫助我如何使用Linq來轉發數據。

Answer 1

我想嘗試這樣的事：

var userIds = table.Select(row => row.userid).Distinct(); 
var checkTimes = table.Select(row => row.CheckTime).Distinct(); 

var pivotTable = 
    from userid in userIds 
    select new { 
     userid, 
     attflags = checkTimes.Select(checkTime => 
      table.Where(row => row.userid == userid && row.CheckTime == checkTime) 
       .Select(row => row.attflag) 
       .DefaultIfEmpty("-") 
       .FirstOrDefault()) 
    }; 

Console.WriteLine("userid\t" + String.Join("\t", checkTimes)); 
foreach (var pivotRow in pivotTable) 
    Console.WriteLine(pivotRow.userid + "\t" + String.Join("\t", pivotRow.attflags));