Enum.ToString不工作

Question

檢查此代碼Sniplet了。

using (AttendanceDataContext db = new AttendanceDataContext()) 
{ 
var attendance = db.attendpunches.Select(at => new RawEmployeeCheckInOutInfo 
        { 
         CheckTime = at.punchtime.Value, 
         Direction = ((AttendanceDirection)at.direction.Value).ToString() 
        }); 

...

AttendanceDirection是枚舉哪個...

public enum AttendanceDirection : int 
{ 
    CheckIn = 1, 
    CheckOut = 2 
} 

的問題是方向=（（AttendanceDirection）at.direction.Value）的ToString（）是總是返回字節值。

Answer 1

我懷疑問題是ToString正在數據庫端有效地執行，它不知道枚舉名稱。試試這個：

var attendance = db.attendpunches 
        .Select(at => new { CheckTime = at.punchtime.Value, 
             Direction = at.direction.Value }) 
        .AsEnumerable() // Do the rest of the query in-process... 
        .Select(at => new RawEmployeeCheckInOutInfo { 
         CheckTime = at.CheckTime, 
         Direction = ((AttendanceDirection) at.Direction).ToString() 
        });