[UWP] [XAML] [VB]嵌套的ContentControl（s）未更新 [英] [UWP][XAML][VB]Nested ContentControl(s) not Updating

问题描述

我有一个ContentControl，其ContentTemplate包含多个ContentControl。以下是用于第一个（外部）ContentControl的DataTemplate的基本布局（我删除了不相关的控件）：

< DataTemplate x：Key =" KeyCardTemplate"> 
< Grid Margin =" 5"背景= QUOT;＃FF89776B"宽度= QUOT; 215"高度= QUOT; 215" CornerRadius = QUOT; 15"的Horizo​​ntalAlignment = QUOT;中心" VerticalAlignment = QUOT;中心"> 
< Grid.ColumnDefinitions> 
< ColumnDefinition Width =" 10" /> 
< ColumnDefinition Width =" 10" /> 
< ColumnDefinition Width =" *" /> 
< ColumnDefinition Width =" 10" /> 
< ColumnDefinition Width =" 10" /> 
< /Grid.ColumnDefinitions> 
< Grid.RowDefinitions> 
< RowDefinition Height =" 10" /> 
< RowDefinition Height =" 10" /> 
< RowDefinition Height =" *" /> 
< RowDefinition Height =" 10" /> 
< RowDefinition Height =" 10" /> 
< /Grid.RowDefinitions> 
 
< ContentControl ContentTemplate =" {StaticResource KeyCardColorTemplate}" Grid.Column = QUOT; 2英寸Grid.Row = QUOT 1 QUOT;的Horizo​​ntalAlignment = QUOT;中心"含量=" {结合}" /> 
< ContentControl ContentTemplate =" {StaticResource KeyCardColorTemplate}" Grid.Column = QUOT; 2英寸Grid.Row = QUOT; 2英寸Grid.ColumnSpan = QUOT; 2英寸VerticalAlignment = QUOT;中心" Horizo​​ntalAlignment =" Rig 
< ContentControl ContentTemplate =" {StaticResource KeyCardColorTemplate}" Grid.Column = QUOT; 2英寸Grid.Row = QUOT; 3英寸的Horizo​​ntalAlignment = QUOT;中心" RenderTransformOrigin = QUOT; 0.5,0.5" Content =" {
< ContentControl ContentTemplate =" {StaticResource KeyCardColorTemplate}" Grid.Column = QUOT 1 QUOT; Grid.Row = QUOT; 2英寸Grid.ColumnSpan = QUOT; 2英寸VerticalAlignment = QUOT;中心" Horizo​​ntalAlignment =" Lef 
 
< Viewbox Grid.Column =" 2" Grid.Row = QUOT; 2英寸;> 
< Grid Background =" Black" BorderBrush = QUOT;＃FF444444"了borderThickness = QUOT 1 QUOT; CornerRadius = QUOT; 5英寸余量= QUOT; 3英寸填充= QUOT; 10"> 
< ItemsControl ItemsSource =" {Binding SquareTypes}"> 
< / ItemsControl> 
< / Grid> 
< / Viewbox> 
< / Grid> 
< / DataTemplate> 

尝试更新时，我使用以下代码（Me.TestKeyCard是我的自定义类型的实例，WordCardType是枚举）：

 Dim temp As WordCardType（）= Me.TestKeyCard.SquareTypes 
 Me.TestKeyCard.SquareTypes = Nothing 
 Me.cntEdit.Content = Me.TestKeyCard 
 Me.TestKeyCard.SquareTypes = temp 
 Me.cntEdit.Content = Me.TestKeyCard 

如您所见，我设置了SquareTypes属性（如你可以在我的XAML中看到，这是ItemsControl的ItemsSource绑定的属性）到Nothing，将它分配给ContentControl的Content属性（Me.cntEdit.Content），然后恢复该值，
再次分配它。这使ItemsControl更新（因为SquareTypes是它的ItemsSource绑定的属性），但内部ContentControl没有更新。我对解决方案的第一个想法是做类似的事情来使内部ContentControl（s）
更新，但由于内部ContentControl的内容没有绑定到特定属性（Content =" {Binding }"），这似乎不起作用。任何人都可以帮我弄清楚该怎么办？谢谢。

---

Nathan Sokalski [e-mail] http://www.nathansokalski.com/

解决方案

Nathan Sokalski，

我无法用你的代码片段重现问题。

形成代码片段，内部ContentControl的DataContext是外部ContentControl。您想将内部ContentControl的内容绑定到外部ContentControl的内容吗？如果是这样，这个
{绑定内容} 是否有效？

如果您可以分享我的样本以找出问题，那会更好。请删除所有敏感代码和一个可以重现问题的简单演示就足够了。 

祝你好运，

Roy

I have a ContentControl whose ContentTemplate contains several ContentControl(s). Here is the basic layout of DataTemplate used for the first (outer) ContentControl (I have removed irrelevant controls):

<DataTemplate x:Key="KeyCardTemplate">
	<Grid Margin="5" Background="#FF89776B" Width="215" Height="215" CornerRadius="15" HorizontalAlignment="Center" VerticalAlignment="Center">
		<Grid.ColumnDefinitions>
			<ColumnDefinition Width="10"/>
			<ColumnDefinition Width="10"/>
			<ColumnDefinition Width="*"/>
			<ColumnDefinition Width="10"/>
			<ColumnDefinition Width="10"/>
		</Grid.ColumnDefinitions>
		<Grid.RowDefinitions>
			<RowDefinition Height="10"/>
			<RowDefinition Height="10"/>
			<RowDefinition Height="*"/>
			<RowDefinition Height="10"/>
			<RowDefinition Height="10"/>
		</Grid.RowDefinitions>

		<ContentControl ContentTemplate="{StaticResource KeyCardColorTemplate}" Grid.Column="2" Grid.Row="1" HorizontalAlignment="Center" Content="{Binding}"/>
		<ContentControl ContentTemplate="{StaticResource KeyCardColorTemplate}" Grid.Column="2" Grid.Row="2" Grid.ColumnSpan="2" VerticalAlignment="Center" HorizontalAlignment="Rig
		<ContentControl ContentTemplate="{StaticResource KeyCardColorTemplate}" Grid.Column="2" Grid.Row="3" HorizontalAlignment="Center" RenderTransformOrigin="0.5,0.5" Content="{
		<ContentControl ContentTemplate="{StaticResource KeyCardColorTemplate}" Grid.Column="1" Grid.Row="2" Grid.ColumnSpan="2" VerticalAlignment="Center" HorizontalAlignment="Lef

		<Viewbox Grid.Column="2" Grid.Row="2">
			<Grid Background="Black" BorderBrush="#FF444444" BorderThickness="1" CornerRadius="5" Margin="3" Padding="10">
				<ItemsControl ItemsSource="{Binding SquareTypes}">
				</ItemsControl>
			</Grid>
		</Viewbox>
	</Grid>
</DataTemplate>

When attempting to update this, I use the following code (Me.TestKeyCard is an instance of a custom type of mine, and WordCardType is an Enum):

Dim temp As WordCardType() = Me.TestKeyCard.SquareTypes
Me.TestKeyCard.SquareTypes = Nothing
Me.cntEdit.Content = Me.TestKeyCard
Me.TestKeyCard.SquareTypes = temp
Me.cntEdit.Content = Me.TestKeyCard

As you can see, I set the SquareTypes property (as you can see in my XAML, this is the property that the ItemsControl's ItemsSource is bound to) to Nothing, assign it to the ContentControl's Content property (Me.cntEdit.Content), then restore the value and assign it again. This makes the ItemsControl update (since SquareTypes is the property it's ItemsSource is bound to), but the inner ContentControl(s) are not being updated. My first thought for a solution was to do something similar to make the inner ContentControl(s) update, but since the Content of the inner ContentControl(s) is not bound to a specific property (Content="{Binding}"), this did not seem to work. Can anybody help me figure out what to do? Thanks.

---

Nathan Sokalski [e-mail] http://www.nathansokalski.com/

解决方案

Hi Nathan Sokalski,

I could not reproduce the problem with your code snippet.

Form the code snippet, the inner ContentControl's DataContext is the outer ContentControl. Do you want to bind inner ContentControl's content to outer ContentControl's content? If so, does this {binding content} work?

It would be better if you could share me a sample to find out the problem. Please delete all the sensitive code and a simple demo that could reproduce the problem will be enough. 

Best regards,

Roy

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