将布尔值更改为可见性转换器从代码隐藏 - wpf c #
本文关键字：隐藏 代码 wpf 转换器 布尔值 可见性 | 更新日期: 2023-09-27 18:32:04
<Page.Resources>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="booleanToVisibilityConverter" x:Name="testTest" />
</ResourceDictionary>
</Page.Resources>
项目控制：
<Grid Grid.Row="1" Grid.ColumnSpan="2" Name="testName">
<ScrollViewer VerticalScrollBarVisibility="Hidden" PanningMode="Both">
<ItemsControl ItemsSource="{Binding Path=NextMeetingList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Grid.Column="0" Grid.Row="0">
<Border x:Name = "myVariable" Grid.Column="0" Grid.Row="0" Margin="10" Height="30" Background="#A2C2E7" CornerRadius="5" BorderBrush="#A2C2E7">
<Grid Margin="8,0,8,0" Background="#A2C2E7">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Foreground="White" FontWeight="Bold" FontSize="15" Margin="0,4,0,0" HorizontalAlignment="Left">month</TextBlock>
<TextBlock Grid.Row="0" Grid.Column="1" Foreground="White" FontWeight="Bold" FontSize="15" Margin="0,4,0,0" HorizontalAlignment="Right">1 Meeting</TextBlock>
</Grid>
</Border>
<Border Grid.Column="0" Grid.Row="0" Margin="10" Height="60" Background="GhostWhite" CornerRadius="3" BorderBrush="{Binding BorderColor}" BorderThickness="0,8,0,0">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="118"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="40" Margin="10,5,0,0" Style="{DynamicResource Lato-Semibold}" Text="{Binding endDate.Day}"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="12" Margin="77,13,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text="{Binding DayString}"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="14" Margin="70,26,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text="{Binding endDate.Hour}"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="14" Margin="86,26,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text=":"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="14" Margin="90,26,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text="{Binding MinuteString}"/>
<Border Grid.Row="0" Grid.Column="0" Width="1" BorderBrush="#BABABA" Height="40" Margin="115,-6,0,0" BorderThickness="1" HorizontalAlignment="Left"></Border>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left" Text="{Binding subject}" FontWeight="Bold" FontSize="17" Margin="10,10,0,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" Width="Auto" TextWrapping="Wrap" HorizontalAlignment="Left" Text="{Binding descr}" FontSize="10" Margin="20,27,150,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Text="{Binding companyName}" FontSize="10" Margin="0,10,30,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Text="sala del consiglio" FontSize="10" Margin="0,27,30,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Text=">" FontSize="15" VerticalAlignment="Center" Margin="0,-5,10,0"/>
</Grid>
</Border>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</Grid>
大家好，我应该能够在WPF中的ItemsControl中折叠网格。
问题是我无法理解如何从代码隐藏中使用布尔到可见性转换器。也许我错过了一杯水，但我无法连接该怎么做，如果名称TestTest隔膜看不到它，那么代码隐藏。
从代码隐藏中，我没有看到"myVariable"
要从代码隐藏中获取转换器，您必须在Page的Resources字典中查找它。在Page课上做这样的事情：
IValueConverter converter = this.Resources["booleanToVisibilityConverter"] as IValueConverter;
没有必要为转换器的资源条目提供一个Name;在这里你想使用Key。此外，转换器通常与 XAML 绑定一起使用 - 如果需要代码中的转换器，只需实例化一个：
IValueConverter converter = new BooleanToVisibilityConverter();
常见的用法是这样的：
<Window.Resources>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="Converter" />
</ResourceDictionary>
</Window.Resources>
<Grid Visibility="{Binding Display, Converter={StaticResource Converter}}">
...
</Grid>
代码隐藏，使用窗口类本身作为数据上下文：
public partial class MainWindow
{
public bool Display { get; set; };
public MainWindow()
{
InitializeComponent();
DataContext = this; // For the binding
Display = true;
}
}
好的，还有一个，这次没有数据绑定或转换器：
<Grid x:Name="myGrid">
...
</Grid>
代码隐藏：
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
myGrid.Visibility = Visibility.Visible;
}
}
上面没有解释为什么OP不能从代码隐藏中引用"myVariable"。这是因为它位于模板中，该模板（动态）实例化一次集合中的每个项。
仍然可以从代码中动态地获取它。例如，此 XAML 使用DataTemplate：
<ItemsControl ItemsSource="{Binding Names}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid x:Name="innerGrid" Loaded="OnGridLoaded" DataContext="{Binding Name, Mode=OneWay}">
<TextBox Text="{Binding Path=., Mode=OneWay}" />
</Grid>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
下面的代码隐藏让我们进入模板，有选择地让"innerGrid"消失：
public class Data
{
public string Name { get; }
public Data(string name)
{
Name = name;
}
}
public partial class MainWindow
{
public Data[] Names { get; } = { new Data("Hello"), new Data("World") };
public MainWindow()
{
InitializeComponent();
DataContext = this;
}
private void OnGridLoaded(object sender, RoutedEventArgs e)
{
Grid outerGrid = sender as Grid;
Grid innerGrid = outerGrid?.FindName("innerGrid") as Grid;
if (innerGrid != null)
{
string name = innerGrid.DataContext as string;
if (name == "Hello")
{
innerGrid.Visibility = Visibility.Collapsed;
}
}
}
}
（为了使字符串易于访问，我将Data对象绑定到"innerGrid"DataContext。