首先,我看到Header的类型和扩展器的内容,它说类型是对象。我有一个名为CommonExpanderUserControl的用户控件,如下所示,
xaml:
<uwpControls:Expander Header="{Binding HeaderContent}" Content="{Binding MainContent}">
</uwpControls:Expander>
在xaml.cs中(DataContext设置为此)
public static readonly DependencyProperty HeaderContentProperty =
DependencyProperty.Register("HeaderContent", typeof(object), typeof(CommonExpanderUserControl), new
PropertyMetadata(null));
public object HeaderContent
{
get { return (object)GetValue(HeaderContentProperty); }
set { SetValue(HeaderContentProperty, value); }
}
public static readonly DependencyProperty MainContentProperty =
DependencyProperty.Register("MainContent", typeof(ContentControl), typeof(CommonExpanderUserControl), new
PropertyMetadata(null));
public ContentControl MainContent
{
get { return (ContentControl)GetValue(MainContentProperty); }
set { SetValue(MainContentProperty, value); }
}
现在我正在如下所示在外部某处使用此UserControl,
<UserControl.Resources>
<ContentControl x:Key="Header">
<Grid x:Name="ExpanderHeaderGrid" HorizontalAlignment="Stretch" Padding="0" Margin="0"
Background="{Binding LisSharedSettings.ChangeHeaderColor,Converter={StaticResource BoolToSolidBrushConverter}}">
<TextBlock x:Name="TextBlockLisSharedSettingsTitle"
x:Uid="/Application.GlobalizationLibrary/Resources/InstrumentSettingsViewLisSettingsTextBlockTitle"
Style="{StaticResource TextBlockStyleSectionHeader}"/>
</Grid>
</ContentControl>
<ContentControl x:Key="Body">
Some content here.
</ContentControl>
</UserControl.Resources>
<Grid>
<local:CommonExpanderUserControl HeaderContent="{StaticResource Header}" MainContent="{StaticResource Body}"/>
</Grid>
绑定这样的内容控件根本行不通。如果我删除MainContent绑定并仅绑定Header,则表示对象引用未设置为对象的实例。请帮忙。
问题出现在StaticResource
绑定中,我们无法通过StaticResource
绑定标题与控件。对于这种情况,更好的方法是绑定StaticResource
并将数据源发送到header属性,如下所示。
HeaderTemplate