ItemsControl OverridesDefaultStyle

Question

我有一个控件HtNavigationMenuCategoryItem。它已设置DefaultStyleKey Constructor; DefaultStyleKey = typeof(HtNavigationMenuCategoryItem);。如果我未设置属性OverridesDefaultStyle，则会收到以下错误＆＃34; itemTemplate and ItemTemplateSelector are ignored for items already of the ItemsControl's container type;＆＃34;。但是当我覆盖它的风格时，它无法正常工作。如果我设置一个新的风格，那么一切正常。我的错误在哪里？如何覆盖Style？

样式不起作用

<Style TargetType="Navigation:HtNavigationMenuCategoryItem">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Navigation:HtNavigationMenuCategoryItem">
                <Grid Margin="10,10,10,0">
                    <StackPanel Orientation="Vertical">
                        <ItemsControl ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=CategoryItems}" OverridesDefaultStyle="True">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <StackPanel Orientation="Vertical"/>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <Controls:FooControl Text="test" Foreground="Yellow"></Controls:FooControl>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </StackPanel>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

样式工作

 <Style x:Key="HtNavigationMenuCategoryItemSingle" TargetType="Navigation:HtNavigationMenuCategoryItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Navigation:HtNavigationMenuCategoryItem">
                    <Controls:FooControl Text="test" Foreground="Yellow"></Controls:FooControl>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>



 <Style TargetType="Navigation:HtNavigationMenuCategoryItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Navigation:HtNavigationMenuCategoryItem">
                    <Grid Margin="10,10,10,0">
                        <StackPanel Orientation="Vertical">
                            <ItemsControl ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=CategoryItems}" ItemContainerStyle="{StaticResource HtNavigationMenuCategoryItemSingle}"/>
                        </StackPanel>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

预览使用

Answer 1

如果要为自定义WPF控件提供默认默认样式，则应定义调用static方法的DefaultStyleKeyProperty.OverrideMetadata构造函数：

public class HtNavigationMenuCategoryItem : ItemsControl
{
    static HtNavigationMenuCategoryItem()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(HtNavigationMenuCategoryItem),
            new FrameworkPropertyMetadata(typeof(HtNavigationMenuCategoryItem)));
    }

    public List<string> CategoryItems => new List<string> { "a", "b", "c" };
}

...并在项目根目录中名为ResourceDictionary的文件夹中定义名为Generic.xaml的{​​{1}}中的默认样式，其中定义了自定义控件类：

Themes

这涉及到<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Navigation="clr-namespace:WpfApplication3"> <Style TargetType="Navigation:HtNavigationMenuCategoryItem"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Navigation:HtNavigationMenuCategoryItem"> <Grid Margin="10,10,10,0"> <StackPanel Orientation="Vertical" Background="Yellow"> <TextBlock>...</TextBlock> <ItemsControl ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=CategoryItems}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Vertical"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding}" /> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> </StackPanel> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> 和Style。

  

实际上我有＆＃34; Style工作＆＃34;具有第二个单独样式的解决方案称为＆＃34; HtNavigationMenuCategoryItemSingle＆＃34;。但我想知道它是否可能，或者我如何在ItemsControl中覆盖此样式，就像我在＆＃34;样式不工作＆＃34;解决方案...

我猜你可以定义内联ControlTemplate：

ItemContainerStyle