CheckAll複選框，當SelectAll單擊在c＃

Question

我有一個動態列表框，當selectAll按鈕被點擊時如何選擇列表框中的所有複選框。

的XAML：

StackPanel Width="400" Orientation="Horizontal" Grid.Row="0"> 
        <!--<CheckBox IsThreeState="True" x:Name="cbAllFeatures" Width="111" Content="Select all" Height="78"/>--> 
        <AppBarButton x:Name="Btn_SelectAll" Margin="20,0,0,0" Label="Select All" Icon="SelectAll" Click="Btn_SelectAll_Click" FontWeight="Bold" /> 
        <AppBarButton x:Name="Btn_Delete" Margin="100,0,0,0" Label="Delete All" Icon="Delete" Click="DeleteAll_Click" FontWeight="Bold" /> 
       </StackPanel> 

<ListBox x:Name="listBoxobj" ItemsSource="{Binding}" Background="Transparent" Margin="6" Height="auto" BorderThickness="2" MaxHeight="580" Grid.Row="1" SelectionChanged="listBoxobj_SelectionChanged"> 
        <ListBox.ItemTemplate> 
         <DataTemplate> 
          <Grid Width="330" Height="100" > 
           <Border Margin="5" BorderBrush="White" BorderThickness="1"> 
            <Grid> 
             <Grid.RowDefinitions> 
              <RowDefinition Height="Auto"/> 
              <RowDefinition Height="Auto"/> 
             </Grid.RowDefinitions> 
             <Grid.ColumnDefinitions> 
              <ColumnDefinition Width="50" /> 
              <ColumnDefinition Width="*" /> 
              <ColumnDefinition Width="100" /> 
             </Grid.ColumnDefinitions> 
             <CheckBox Name="Option1CheckBox" Grid.Row="0" Grid.Column="0" IsChecked="{Binding Checked,Mode=TwoWay}" VerticalAlignment="Center" Margin="5,0,0,0" /> 
             <TextBlock x:Name="NameTxt" Grid.Row="0" Grid.Column="1" TextWrapping="Wrap" Text="{Binding Name}" VerticalAlignment="Center" HorizontalAlignment="Left" FontSize="22" Foreground="White"/> 
             <TextBlock x:Name="Age" Grid.Row="1" Grid.Column="1" TextWrapping="Wrap" VerticalAlignment="Center" HorizontalAlignment="Left" Foreground="White" FontSize="22" Text="{Binding Age}" /> 
             <Button Grid.Row="0" Grid.Column="2" x:Name="deleteTaskButton" BorderThickness="0" Margin="0" Click="deleteTaskButton_Click" Height="18" IsEnabled="False"> 
              <Image Source="/Assets/delete.png"/> 
             </Button> 
            </Grid> 
           </Border> 
          </Grid> 
         </DataTemplate> 
        </ListBox.ItemTemplate> 
       </ListBox> 

我試圖做這樣，但它似乎並沒有工作。

class SelectAll : INotifyPropertyChanged 
    { 
     public bool _Checked = false; 

     public bool Checked 
     { 
      get 
      { 
       return _Checked; 
      } 
      set 
      { 
       if (value != _Checked) 
       { 
        _Checked = value; 
        NotifyPropertyChanged("Checked"); 
       } 
      } 
     } 

     public event PropertyChangedEventHandler PropertyChanged; 
     protected virtual void NotifyPropertyChanged(string propertyName) 
     { 
      if (PropertyChanged != null) 
      { 
       PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
      } 
     } 
    } 

單擊select_all時的代碼。

public void Btn_SelectAll_Click(object sender, RoutedEventArgs e) 
    { 
     obj_check._Checked = true; 
    } 

我的想法是使用for-loop。它必須檢查每個項目。但我不知道如何檢查，因爲我不能選擇複選框。任何幫助表示讚賞。

Answer 1

試試這個

先創建這個函數：

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject 
    { 
     if (depObj != null) 
     { 
      for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++) 
      { 
       DependencyObject child = VisualTreeHelper.GetChild(depObj, i); 
       if (child != null && child is T) 
       { 
        yield return (T)child; 
       } 

       foreach (T childOfChild in FindVisualChildren<T>(child)) 
       { 
        yield return childOfChild; 
       } 
      } 
     } 
    } 

創建一個新的布爾：

bool Cheacked = false; 

然後在您的按鈕添加此：

 if (!Cheacked) 
     { 
      IEnumerable<CheckBox> _CheackBox = FindVisualChildren<CheckBox>(this); 
      foreach (CheckBox _CB in _CheackBox) 
      { 
       _CB.IsChecked = true; 
      } 
     } 
     else 
     { 
      IEnumerable<CheckBox> _CheackBox = FindVisualChildren<CheckBox>(this); 
      foreach (CheckBox _CB in _CheackBox) 
      { 
       _CB.IsChecked = false; 
      } 
     } 

會獲取所有對象在窗口中，然後將它們標記爲已檢查