[英]change booleanToVisibilityConverter from code behind - wpf c #
<Page.Resources>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="booleanToVisibilityConverter" x:Name="testTest" />
</ResourceDictionary>
</Page.Resources>
ItemsControl:
<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,我應該能夠在WPF的ItemsControl中創建一個已折疊的網格。
問題是我無法從后面的代碼中了解如何使用booleanToVisibilityConverter。 也許我錯過了一杯水,但是我無法連接該怎么辦,如果名稱TestTest septum看不到它,那么代碼將隱藏在后面。
從后面的代碼中我看不到“ myVariable”
要從后台獲取轉換器,您必須在Page
的Resources
字典中查找它。 在您的Page
類中執行以下操作:
IValueConverter converter = this.Resources["booleanToVisibilityConverter"] as IValueConverter;
不必為轉換器的資源條目Name
。 在這里您要使用Key
。 此外,轉換器通常與XAML綁定一起使用-如果您希望在代碼中使用一個,則只需實例化一個即可:
IValueConverter converter = new BooleanToVisibilityConverter();
常見用法如下:
<Window.Resources>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="Converter" />
</ResourceDictionary>
</Window.Resources>
<Grid Visibility="{Binding Display, Converter={StaticResource Converter}}">
...
</Grid>
在代碼隱藏中,使用window類本身作為數據上下文:
public partial class MainWindow
{
public bool Display { get; set; };
public MainWindow()
{
InitializeComponent();
DataContext = this; // For the binding
Display = true;
}
}
好的,又一次,這次沒有數據綁定或轉換器:
<Grid x:Name="myGrid">
...
</Grid>
后台代碼:
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
myGrid.Visibility = Visibility.Visible;
}
}
上面沒有解釋為什么OP無法從代碼后面引用“ myVariable”。 這是因為它在模板中,該模板在集合中的每個項目均被實例化(動態)一次。
仍然可以從代碼中動態地獲取它。 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>
下面的代碼讓我們進入模板,使“ innerGrid”有選擇地消失:
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;
}
}
}
}
(為了使字符串易於訪問,我將Data
對象綁定到了“ innerGrid” DataContext
。)
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