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[英]How do you bind an observable collection to a listview located in a modal/window?
[英]How do you bind user control properties to properties of an observable object contained in observable collection
我正在使用 MVVMLight 並且需要能夠在視圖初始化期間對大約 12 個切換框的屬性進行編程編輯。 由於它們太多,我想遍歷鏈接的屬性,我嘗試使用ObservableCollection
的ObservableObject
其中包含要綁定到切換按鈕屬性的值。 我不確定這是綁定問題還是從ObservableObject
繼承的INotifyPropertyChanged
接口的錯誤實現。
這是包含我希望綁定到的屬性的類:
public class CavitySelect : ObservableObject
{
private string _Text;
public string Text
{
get { return _Text; }
set
{
_Text = value;
RaisePropertyChanged("Text");
}
}
private bool _Visible;
public bool Visible
{
get { return _Visible; }
set
{
_Visible = value;
RaisePropertyChanged("Visible");
}
}
private bool _Toggle;
public bool Toggle
{
get { return _Toggle; }
set
{
_Toggle = value;
RaisePropertyChanged("Toggle");
}
}
public CavitySelect()
{
Text = "";
Visible = false;
Toggle = false;
}
}
這是我的ObservableCollection
的實例化:
private ObservableCollection<CavitySelect> _CavTogglesProperties;
public ObservableCollection<CavitySelect> CavTogglesProperties
{
get { return _CavTogglesProperties; }
set
{
_CavTogglesProperties = value;
RaisePropertyChanged("CavTogglesProperties");
}
}
public MyViewModel()
{
this.CavTogglesProperties = GetCavities();
}
public ObservableCollection<CavitySelect> GetCavities()
{
CavitySelect t11 = new CavitySelect();
CavitySelect t12 = new CavitySelect();
CavitySelect t13 = new CavitySelect();
CavitySelect t14 = new CavitySelect();
CavitySelect t15 = new CavitySelect();
CavitySelect t16 = new CavitySelect();
CavitySelect t26 = new CavitySelect();
CavitySelect t21 = new CavitySelect();
CavitySelect t22 = new CavitySelect();
CavitySelect t23 = new CavitySelect();
CavitySelect t24 = new CavitySelect();
CavitySelect t25 = new CavitySelect();
ObservableCollection<CavitySelect> temp = new ObservableCollection<CavitySelect>() {t11,t12,t13,t14,t15,t16,t21,t22,t23,t24,t25,t26};
return temp;
}
這是我嘗試綁定它的方式:
<Window.Resources>
<BooleanToVisibilityConverter x:Key="BoolToVisibilty"/>
</Window.Resources>
<Grid Background="#FFF4F4F5" Margin="8,165,8,8" DataContext="{Binding CavTogglesProperties}">
<ToggleButton DataContext="{Binding t11}" Content="{Binding Text}" IsChecked="{Binding Toggle}" Visibility="{Binding Visible,Converter={StaticResource BoolToVisibilty}}"/>
</Grid>
我已經確認 View 到 ViewModel 類的綁定工作正常。 我也嘗試過綁定而不先設置包含網格的DataContext
,例如:
<ToggleButton DataContext="{Binding CavTogglesProperties[t11]}" ... />
澄清一下:每個 CavitySelect 項都與 GridView 中的一個切換按鈕相關,並且屬性將根據未顯示的輸入進行初始化。
你的問題並沒有說得很清楚,但我相信你想在你的 UI 中顯示一個項目列表; 但是,正如當前實現的那樣,您的 XAML 確實結構化為顯示單個項目。
要顯示列表,您需要查看各種集合視圖中的任何一種(例如ListView 、 GridView等)。
例如:
<Window.Resources>
<BooleanToVisibilityConverter x:Key="BoolToVisibilty"/>
</Window.Resources>
<Grid Background="#FFF4F4F5" Margin="8,165,8,8">
<ListView ItemsSource="{Binding CavTogglesProperties}">
<ListView.ItemTemplate>
<DataTemplate>
<ToggleButton Content="{Binding Text}" IsChecked="{Binding Toggle}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
要僅顯示特定項目,您應該在 ViewModel 中過濾列表,而不是綁定可見性。 如果可見的項目在顯示時沒有改變,只需在填充列表時過濾列表。
但是,如果可見性會發生變化並且您希望視圖反映這些變化,請查看為您的項目源實現過濾器,如以下問題中所述: 如何在 WPF 中過濾 ListView? .
由於您已經在使用 ObservableCollection 和 ObservableObject,所以一切都應該自動更新。
如果我讀錯了您的問題並且您想知道如何顯示集合中的單個項目,則有幾種不同的方法可以解決這個問題:
不過,我強烈建議使用選項 1,因為它最符合 MVVM,生成最干凈和最可測試的代碼。
例如:
private ObservableCollection<CavitySelect> _CavTogglesProperties;
public ObservableCollection<CavitySelect> CavTogglesProperties
{
get { return _CavTogglesProperties; }
set
{
_CavTogglesProperties = value;
RaisePropertyChanged("CavTogglesProperties");
}
}
private CavitySelect _SpecificCavToggle;
public CavitySelect SpecificCavToggle
{
get { return _SpecificCavToggle; }
set
{
_SpecificCavToggle= value;
RaisePropertyChanged("SpecificCavToggle");
}
}
public MyViewModel()
{
this.CavTogglesProperties = GetCavities();
this.SpecificCavToggle = this.CavTogglesProperties[0];
}
public ObservableCollection<CavitySelect> GetCavities()
{
CavitySelect t11 = new CavitySelect();
CavitySelect t12 = new CavitySelect();
CavitySelect t13 = new CavitySelect();
CavitySelect t14 = new CavitySelect();
CavitySelect t15 = new CavitySelect();
CavitySelect t16 = new CavitySelect();
CavitySelect t26 = new CavitySelect();
CavitySelect t21 = new CavitySelect();
CavitySelect t22 = new CavitySelect();
CavitySelect t23 = new CavitySelect();
CavitySelect t24 = new CavitySelect();
CavitySelect t25 = new CavitySelect();
ObservableCollection<CavitySelect> temp = new ObservableCollection<CavitySelect>() {t11,t12,t13,t14,t15,t16,t21,t22,t23,t24,t25,t26};
return temp;
}
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