wpf - 使用键从 ResourceDictionary 中获取资源

Question

我有一个 WPF 窗口，它应该从 XAML 文件加载两个矢量图像。 (每个文件都在一个单独的文件中，以便于在 Expression Design 中进行修改。)

当我在 MergedDictionary 中包含 XAML 文件时，它工作正常。
这是我使用的代码:

<Window.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Images/LCCD logo.xaml" />
            <ResourceDictionary Source="Images/LCCD bottom image.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Window.Resources>

和

<Image Source="{Binding Source={StaticResource LCCDlogo}}" /> <!-- Simplified -->
<Image Source="{Binding Source={StaticResource LCCDbar}}" /> <!-- Simplified -->

但是，我现在需要向 Window 的资源添加更多内容。新资源属于这个窗口，所以我们希望它在同一个文件中，而不是包含在一个文件中。

当我在 <Window.Resources> 之间添加以下代码时和 <ResourceDictionary> ，我收到以下错误:

代码

<Style TargetType="{x:Type tab:FabTabItem}">
        <Setter Property="Header" Value="{Binding Path=LabelText}"/>
        <Setter Property="HeaderTemplate">
            <Setter.Value>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal" Margin="0,0,4,0">
                        <TextBlock Text="{Binding}" TextTrimming="CharacterEllipsis"/>
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>

警告

The designer does not support loading dictionaries that mix 'ResourceDictionary' items without a key and other items in the same collection. Please ensure that the 'Resources' property does not contain 'ResourceDictionary' items without a key, or that the 'ResourceDictionary' item is the only element in the collection.

所以我改了 <ResourceDictionary>标记为:

<ResourceDictionary x:Key="Images">

但是，我现在不知道如何访问此字典中的资源。您如何从名为 ResourceDictionary 的内部获取资源?

编辑

没关系。这编译但不运行。

错误是:

''Resources' property has already been set on 'MainWindow'.

我想我将不得不以其他方式做到这一点。

Answer 1

根据 MergedResourceDictionary's 上的 MSDN 页面在 MergedDictionary 中指定的资源字典中定义资源是合法的，但并不常见。从上面的页面。

It is legal to define resources within a ResourceDictionary that is specified as a merged dictionary, either as an alternative to specifying Source, or in addition to whatever resources are included from the specified source. However, this is not a common scenario; the main scenario for merged dictionaries is to merge resources from external file locations. If you want to specify resources within the markup for a page, you should typically define these in the main ResourceDictionary and not in the merged dictionaries.

所以试试这个，看看它是否有效。

<Window.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Images/LCCD logo.xaml" />   
            <ResourceDictionary Source="Images/LCCD bottom image.xaml" />
            <ResourceDictionary>
                <Style TargetType="{x:Type tab:FabTabItem}">
                    <Setter Property="Header" Value="{Binding Path=LabelText}"/>
                    <Setter Property="HeaderTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal" Margin="0,0,4,0">
                                    <TextBlock Text="{Binding}" TextTrimming="CharacterEllipsis"/>
                                </StackPanel>
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </ResourceDictionary>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Window.Resources>