protected async override void OnAppearing()
{
base.OnAppearing();
var week = await SemesterTime.GetWeekAsync();
WeekToolbarItem.Text = $"第{week}周";
}
public SemesterSelectionViewModel()
{
Semesters = new ObservableCollection <string>();
Weeks = new ObservableCollection <int>();
// 一般是 20 周，如果 remote api 给的周数过多，则进行适配
int max_week = Math.Max(20, SemesterTime.Week);
var weeks = Enumerable.Range(1, max_week).ToList();
foreach (var w in weeks)
{
Weeks.Add(w);
if (w == SemesterTime.Week)
{
WeekSelectedItem = w;
}
}
var semesters = SemesterTime.GetSemesterAll(2018);
foreach (var s in semesters)
{
Semesters.Add(s);
if (s == SemesterTime.Semester)
{
SemesterSelectedItem = s;
}
}
}
private async Task ExecuteLoadItemsCommand()
{
IsBusy = true;
try
{
IEnumerable <IListItem> items;
string semester = SemesterTime.GetThisSemester();
int week = await SemesterTime.GetWeekAsync();
if (Items.Count == 0)
{
// 第一次获取先从本地文件缓存获取
items = await DataStore.GetCoursesFromCacheAsync(semester, week, dayOfWeek);
}
else
{
// 手动刷新，则从网络Api获取
Items.Clear();
items = await DataStore.GetCoursesAsync(semester, week, dayOfWeek);
}
foreach (var item in items)
{
Items.Add(item);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
finally
{
IsBusy = false;
}
}
public Semester(SemesterTime sname, int date)
{
season = sname;
SchoolYear = date;
coursesOffered = new TeachingCourse[10];
}