WPF:从 DataTemplateSelector 类中的 UserControl 中查找资源 [英] WPF: Find Resources from UserControl within DataTemplateSelector class

问题描述

我知道有这个线程:如何从 WPF 中的 DataTemplateSelector 类中查找 UserControl 中的资源?

同样的问题.

但是……我对答案不满意！一定有办法获取

BUT... I am not satisfied with the answer! THERE MUST be a way to grab the Resources of the

包含声明此内容的 ContentControl/Presenter 的 UserControl:

UserControl containing the ContentControl/Presenter declaring this:

ContentTemplateSelector="{StaticResource MySelector}" 

每个派生的 DataTemplateSelector 类在其 SelectedTemplate 方法中的一个参数 =>

Each derived DataTemplateSelector class a parameter in its SelectedTemplate Method =>

类型为 DependencyObject 的容器.

container which is typeof DependencyObject.

就我而言，容器是内容控件.

Well container is in my case the contentcontrol.

是否不可能从contentcontrol"开始爬上可视化树并尝试通过 FindAncestor 获取 UserControl ?

推荐答案

是的，您可以将 container 参数强制转换为 FrameworkElement 并调用 FindResource 从 ContentPresenter.例如:

Yes, you can cast the container parameter to FrameworkElement and call FindResource to do a resource lookup starting at the ContentPresenter. For example:

代码:

public class MySelector
    : DataTemplateSelector
{
    public override DataTemplate SelectTemplate
        (object item, DependencyObject container)
    {
        // Determine the resource key to use
        var key = item.ToString() == "a" ? "one" : "two";
        // Find the resource starting from the container
        return ((FrameworkElement)container).FindResource(key) as DataTemplate;
    }
}

XAML:

<UserControl
    x:Class="WpfApplication1.UserControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication1"
    >
    <UserControl.Resources>
        <DataTemplate x:Key="one">
            <TextBlock>Template One</TextBlock>
        </DataTemplate>
        <DataTemplate x:Key="two">
            <TextBlock>Template Two</TextBlock>
        </DataTemplate>
        <local:MySelector x:Key="MySelector"/>
    </UserControl.Resources>
    <StackPanel>
        <ContentPresenter
            ContentTemplateSelector="{StaticResource MySelector}"
            Content="a"/>
        <ContentPresenter
            ContentTemplateSelector="{StaticResource MySelector}"
            Content="b"/>
    </StackPanel>
</UserControl>

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