5
我有MainPageViewModel項目（ObservableCollection）。在這個頁面上我還有一個按鈕，可以爲項目添加新項目。Caliburn Micro中的墓碑
public class MainPageViewModel : Screen {
private DateTime StartActivity = DateTime.MinValue;
public ObservableCollection<ActivityViewModel> Items { get; set; }
public MainPageViewModel(INavigationService navigationService) {
this.Items = new ObservableCollection<ActivityViewModel>();
}
public void AddActivity(string activityName) {
if (this.Items.Count == 0) {
this.Items.Add(new ActivityViewModel() {
Activity = activityName,
Duration = 0
});
StartActivity = DateTime.Now;
}
else {
this.Items[this.Items.Count - 1].Duration = 10;
this.Items.Add(new ActivityViewModel() {
Activity = activityName,
Duration = 0
});
StartActivity = DateTime.Now;
}
}
}
添加新項目的作品完美。
但是應用程序在墓碑後激活時，項目中的數據不會恢復。嘗試爲我的ViewModel創建StorageHandler。沒有幫助。我做錯了什麼？
public class MainPageViewModelStorage : StorageHandler<MainPageViewModel> {
public override void Configure() {
Property(x => x.Items)
.InAppSettings()
.RestoreAfterActivation();
}
}
另請嘗試爲類和屬性添加[SurviveTombstone]，但Visual Studio不知道該屬性。
public class ActivityViewModel : PropertyChangedBase {
private string _activity;
public string Activity {
get {
return _activity;
}
set {
if (value != _activity) {
_activity = value;
NotifyOfPropertyChange(() => Activity);
}
}
}
private double _duration;
public double Duration {
get {
return _duration;
}
set {
if (value != _duration) {
_duration = value;
NotifyOfPropertyChange(() => Duration);
}
}
}
}