如何在计划中生成缺失的日期？

Question

我有一个只包含一周训练（31次训练）的时间表，现在我需要生成其余的训练，直到时间表结束（例如20120601-20120831）。 所以我想可能循环锻炼，并把addDays（7）放在所有workout.date上。

我已经尝试使用foreach和for，但不能得到它的工作。

我GenerateSchedule方法：

public ActionResult GenerateSchedule(int scheduleId) 
    { 
     //get schedule included list of 31 workouts 
     //only added one week on workouts 
     var schedule = _scheduleServices.GetSchedule(scheduleId); 
     var workouts = schedule.Workouts.ToList(); 
     int i = 0; 
     for(var day = schedule.FromDate; day.Date <= schedule.ToDate; day = day.AddDays(1)) 
     { 
      foreach (var workout in workouts) 
      { 

      } 

      var newWorkout = new WorkoutFormModel 
      { 
       ScheduleId = workouts[i].ScheduleId, 
       Date = workouts[i].Date.AddDays(7), 
       StartTime = workouts[i].StartTime, 
       EndTime = workouts[i].EndTime, 
       InstructorId = workouts[i].Instructor.Id, 
       CourseId = workouts[i].Course.Id, 
      }; 

      i++; 
      _workoutServices.AddWorkout(newWorkout); 
     } 

     /* 
     foreach(var workout in schedule.Workouts) 
     { 
      if (workout.Date.AddDays(7) <= schedule.ToDate) 
      { 
       var newWorkout = new WorkoutFormModel 
            { 
             ScheduleId = workout.ScheduleId, 
             Date = workout.Date.AddDays(7), 
             StartTime = workout.StartTime, 
             EndTime = workout.EndTime, 
             InstructorId = workout.Instructor.Id, 
             CourseId = workout.Course.Id, 

            }; 
       _workoutServices.AddWorkout(newWorkout); 
      } 
     }*/ 

     return RedirectToAction("Overview", new { scheduleId }); 
    } 

更新：

private static List<WorkoutFormModel> ExtendSchedule(Schedule schedule) 
    { 
     var workoutList = new List<WorkoutFormModel>(); 

     for (var workoutStart = schedule.FromDate; workoutStart <= schedule.ToDate; workoutStart = workoutStart.AddDays(7)) 
     { 


      workoutList.AddRange(schedule.Workouts.Select(Workout => new WorkoutFormModel 
      { 
       ScheduleId = schedule.Id, 
       Date = workoutStart.Add(Workout.WeekOffset), 
       StartTime = Workout.StartTime, 
       EndTime = Workout.EndTime, 

       Course = Workout.Course 
      })); 
     } 

     return workoutList; 
    } 

Answer 1

DateTime是immutable。也就是说，AddDays()返回DateTime的新实例，使您将其调用的实例保持不变。所以，你的循环可能是这样的：

for(var day = schedule.FromDate; day.Date <= schedule.ToDate; day = day.AddDays(1)) 

编辑：现在，我们一致认为它更像是一个设计问题，我的建议是：

• 写了下面的帮助功能，请尽可能详细说明其输入：

  private List<WorkoutFormModel> ExtendSchedule(Schedule schedule, IEnumerable<WorkoutInfo> oneWeekWorkouts) 
  { 
      var workoutList = new List<WorkoutFormModel>(); 
      foreach (var workoutStart = schedule.FromDate; workoutStart <= schedule.ToDate; workoutStart = workoutStart.AddDays(7)) 
      { 
       workoutList.AddRange(oneWeekWorkouts.Select(workout => new WorkoutFormModel 
            { 
             ScheduleId = schedule.Id, 
             Date = workoutStart.Add(workout.WeekOffset), 
             StartTime = ?, 
             EndTime = ?, 
             InstructorId = workout.Instructor.Id, 
             CourseId = workout.Course.Id 
            })); 
      } 
  
      return workoutList; 
  } 
  

  其中WorkoutInfo是表示锻炼的类。我对它的命名方式不同，因此它不会与您使用的类型相冲突，但基本上与您的Schedule.Workouts列表中的项目相同。主要区别在于，在我的WorkoutInfo中，您不保留锻炼将要进行的特定时间点，而是从本周开始的偏移量，形式为TimeSpan成员WeekOffset。如您所见，使用这种表示法，将一周的计划延长到整个计划表会更直接。

您可以填写空白并将我的建议与您的代码库对齐。也许你会想创建这个新的WorkoutInfo类，也许它会更好地与你现有的Workout类合并，这取决于你的项目的全貌。

如果您遇到更多困难，请告诉我。