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我目前正在使用Windows通用應用程序。一般來說，我對XAML還是比較陌生的，但有一些經驗。通用應用程序XAML綁定不能在UserControl時在另一個用戶控件中工作
我遇到的問題是圍繞UserControl內部的綁定。我環顧四周，無法找到我的具體問題的答案。
我有一個鏈接到一個視圖模型一個XAML頁面，這一切工作正常。然後在那個頁面上，我使用一個UserControl，它基本上只是一個帶有包含一些內容的標題的面板。在該面板的內容中，我有另一個基本上由Label和TextBox組成的UserControl。
當我從我的ViewModel到的ContentPanel用戶控件綁定的一切事物工精細，它拿起我的ViewModel背景下，正確地結合。
但是，當我嘗試綁定到包含在ContentPanel中的LabelledTextbox UserControl時，綁定失敗，因爲它只是查找ContentPanel上ViewModel上的屬性。
請參見下面的代碼我有
Page.xaml
<!--Page.xaml-->
<cc:ContentPanel PanelHeading="LEFT FOOT: Measurements" PanelHeadingBackground="{StaticResource OPCare.PanelHeader}">
<StackPanel>
<cc:LabelledTextbox LabelText="Malleoli Width" Text="test" />
<cc:LabelledTextbox LabelText="Met Head Width" />
</StackPanel>
</cc:ContentPanel>
ContentPanel.xaml
<!--ContentPanel UserControl-->
<UserControl
x:Class="OrthoticTabletApp.Controls.ContentPanel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:OrthoticTabletApp.Controls"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400"
x:Name="Parent">
<Grid DataContext="{Binding ElementName=Parent}">
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid Padding="10" Grid.Column="0" Grid.Row="0" Height="50" Background="{Binding Path=PanelHeadingBackground}">
<TextBlock Height="30" LineHeight="30" Text="{Binding Path=PanelHeading}" />
</Grid>
<Grid Padding="10" Grid.Column="0" Grid.Row="1" Background="White">
<ContentPresenter Content="{Binding Path=PanelBody}" />
</Grid>
</Grid>
</UserControl>
ContentPanel.xaml.cs
[ContentProperty(Name = "PanelBody")]
public sealed partial class ContentPanel : UserControl
{
public static readonly DependencyProperty PanelHeadingProperty = DependencyProperty.Register("PanelHeading", typeof(string), typeof(ContentPanel), new PropertyMetadata(""));
public string PanelHeading
{
get
{
return (string)GetValue(PanelHeadingProperty);
}
set
{
SetValue(PanelHeadingProperty, value);
}
}
public static readonly DependencyProperty PanelBodyProperty = DependencyProperty.Register("PanelBody", typeof(object), typeof(ContentPanel), new PropertyMetadata(null));
public object PanelBody
{
get
{
return (object)GetValue(PanelBodyProperty);
}
set
{
SetValue(PanelBodyProperty, value);
}
}
public Brush PanelHeadingBackground
{
get { return (Brush)GetValue(PanelHeadingBackgroundProperty); }
set { SetValue(PanelHeadingBackgroundProperty, value); }
}
public static readonly DependencyProperty PanelHeadingBackgroundProperty =
DependencyProperty.Register("PanelHeadingBackground", typeof(Brush), typeof(ContentPanel), new PropertyMetadata(null));
public ContentPanel()
{
this.InitializeComponent();
}
}
LabelledTextbox.xaml
個<UserControl
x:Class="OrthoticTabletApp.Controls.LabelledTextbox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:OrthoticTabletApp.Controls"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="50"
d:DesignWidth="400"
x:Name="Parent">
<Grid DataContext="{Binding ElementName=Parent}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="300" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid Grid.Column="0" Padding="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="15" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Path=LabelText}" />
</Grid>
<Grid Grid.Column="1" Padding="10">
<TextBox Text="{Binding Path=Text}" />
</Grid>
</Grid>
</UserControl>
LabelledTextbox.xaml.cs
public sealed partial class LabelledTextbox : UserControl
{
public string LabelText
{
get { return (string)GetValue(LabelTextProperty); }
set { SetValue(LabelTextProperty, value); }
}
// Using a DependencyProperty as the backing store for LabelText. This enables animation, styling, binding, etc...
public static readonly DependencyProperty LabelTextProperty =
DependencyProperty.Register("LabelText", typeof(string), typeof(LabelledTextbox), new PropertyMetadata(null));
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
// Using a DependencyProperty as the backing store for Text. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(LabelledTextbox), new PropertyMetadata(null));
public LabelledTextbox()
{
this.InitializeComponent();
}
}
'' - 這是您將當前用戶控件設置爲DataContext的位置，這就是爲什麼它在'UserControl'中查找綁定屬性的原因。您在LabelledTextBox.xaml和ContentPanel.xaml中都有同樣的問題。如果你刪除'DataContext =「{Binding ElementName = Parent}」'，那麼它應該工作。另外，你在哪裏爲Page.xaml設置'DataContext'？ –
sthotakura