Question

I have a window with the following elements, and I m trying to access the value contained in <TextBlock Name="armingValue" but in my .xaml.cs file it doesn t seem to be recognised.

我需要做些什么来获得价值?

<Window.Resources>
    <DataTemplate DataType="{x:Type ArmingVM:ArmingItem}">
        <CheckBox Margin="10,5" IsChecked="{Binding IsSet}" Content="{Binding Name}"/>
    </DataTemplate>
    <DataTemplate DataType="{x:Type ArmingVM:ArmingBindingData}">
        <DockPanel>
            <ItemsControl ItemsSource="{Binding ArmingItems}" HorizontalAlignment="Left">
                <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                        <StackPanel Orientation="Vertical"/>
                    </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
            </ItemsControl>
            <TextBlock Text="Enum Value: " HorizontalAlignment="Right"/>
            <TextBlock Name="armingValue" Text="{Binding Value}" HorizontalAlignment="Right"/>
        </DockPanel>
    </DataTemplate>
</Window.Resources>

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="193*" />
        <ColumnDefinition Width="551*" />
    </Grid.ColumnDefinitions>

    <Button Content="Get Panel Options" Name="btnGetOptionsConfigruation" Margin="12,12,23,396" Click="btnGetOptionsConfigruation_Click"></Button>

    <StackPanel Grid.Column="1" Height="325" HorizontalAlignment="Left" Margin="68,43,0,0" Name="stackPanel1" VerticalAlignment="Top" Width="438">
        <ItemsControl Name="armingItemsControl" ItemsSource="{Binding}"/>
    </StackPanel>
</Grid>

Answer 1

You do not need to access TextBox value but its binded value. So considering that you have in XAML

 <TextBlock Name="armingValue" Text="{Binding Value}" HorizontalAlignment="Right"/>

页: 1 价值

总是要避免直接进入<代码>WPF中的验证要素,有时会造成(并非如此少见的)直截了<>>。查阅Data,背后。

Answer 2

视力室在<代码>.xaml.cs文档中产生的辅助变量仅针对某些情况生成。用户控制机构内的任何指定要素都将产生背后变量。然而,在模板中不会产生指定的内容。这是因为视觉演播室无法知道如何使用你的模板。例如,可通过<代码>ItemsControl来生成多个模板。在这种情况下,应在<代码>.xaml.cs内产生什么?

你有两种选择:

Use binding, so that the state of your TextBlock.Text property is bound to a view model, so that you do not have to access the TextBlock element directly.
walk the visual tree to locate your TextBlock at runtime.

关于(2),我建议使用Linq-to-VisualTree,请查阅:

TextBlock block = layoutRoot.Descendants<TextBlock>()
                            .Cast<TextBlock>().Where(tb => tb.Name="armingValue")
                            .Single();

Answer 3

难道我不问,但为什么不给你造成对文本箱的约束力,而是用两种方式加以标识?

<TextBlock Text="Enum Value: " HorizontalAlignment="Right" Text="{Binding Value, Mode=TwoWay}"/>

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