如何在WPF中的DataTemplateSelector类中查找UserControl中的资源？

Question

我正在创建自己的UserControl,我在XAML 的UserControl.Resources部分下有两个不同的DataTemplates .我想在这两个datatemplates之间进行选择,具体取决于listview中显示的对象的属性值.我这样做是通过创建一个自定义DataTemplateSelector类并重写SelectTemplate方法,该方法应该返回我想要使用的DataTemplate.但是,我不知道如何"查找"位于UserControls资源部分的数据模板,我看到的所有示例只从Window.Resources获取数据模板.在这个例子中,他们获取当前的MainWindow然后使用FindResource来查找DataTemplate,我如何以类似的方式获取我的UserControl？:

public override DataTemplate 
            SelectTemplate(object item, DependencyObject container)
        {
            if (item != null && item is AuctionItem)
            {
                AuctionItem auctionItem = item as AuctionItem;
                Window window = Application.Current.MainWindow;

                switch (auctionItem.SpecialFeatures)
                {
                    case SpecialFeatures.None:
                        return 
                            window.FindResource("AuctionItem_None") 
                            as DataTemplate;
                    case SpecialFeatures.Color:
                        return 
                            window.FindResource("AuctionItem_Color") 
                            as DataTemplate;
                }
            }

            return null;
        }

上面的示例来自此处:ItemsControl.ItemTemplateSelector属性

Answer 1

试试这个:

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        if (item != null && item is AuctionItem)
        {
            AuctionItem auctionItem = item as AuctionItem;

            switch (auctionItem.SpecialFeatures)
            {
                case SpecialFeatures.None:
                    return 
                        ((FrameworkElement)container).FindResource("AuctionItem_None") 
                        as DataTemplate;
                case SpecialFeatures.Color:
                    return 
                        ((FrameworkElement)container).FindResource("AuctionItem_Color") 
                        as DataTemplate;
            }
        }

        return null;
    }

Answer 2

我通常使用DataConmplateSelector的构造函数中的UserControl作为参数从后面的代码实例化我的DataTemplateSelector,如下所示:

public class MyUserControl : UserControl
{
    public MyUserControl()
    {
        Resources["MyDataTemplateSelector"] = new MyDataTemplateSelector(this);
        InitializeComponent();
    }
}

public class MyDataTemplateSelector : DataTemplateSelector
{
    private MyUserControl parent;
    public MyDataTemplateSelector(MyUserControl parent)
    {
        this.parent = parent;
    }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        parent.DoStuff();
    }
}

不是镇上最漂亮的女孩,但它完成了工作;)

希望这可以帮助!