DataTemplateSelector和Windows8

Question

我有一个非常奇怪的问题。我写的应用程序使用wpf，telerik(office2007主题)。我使用DataTemplateSelector为不同类型的模型动态创建视图。在Windows7下一切正常，但在Windows8下DataTemplateSelector就不能工作了！见鬼？你能帮我解决我的问题吗？

public class TabDataTemplateSelector:DataTemplateSelector
{
    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        if(item==null || container == null)
            return null;
        FrameworkElement element = Application.Current.MainWindow as FrameworkElement;
        if (element == null)
            return null;
        if (item is PetrochemicalCatalogViewModel)
        {
            return element.FindResource("PetrochemicalCatalogDataTemplate") as DataTemplate;
        }
        if (item is FuelPriceViewModel)
        {
            return element.FindResource("FuelPriceDataTemplate") as DataTemplate;
        }
        if (item is RoleViewModel)
        {
            return element.FindResource("RoleDataTemplate") as DataTemplate;
        }
        if (item is IEquipmentViewModel)
        {
            return element.FindResource("EquipmentDataTemplate") as DataTemplate;
        }
        if (item is IZondsViewModel)
        {
            return element.FindResource("ZondDataTemplate") as DataTemplate;
        }
        if (item is ITankCatalogViewModel)
        {
            return element.FindResource("TanksDataTemplate") as DataTemplate;
        }
        if (item is IDispensersWorkplaceViewModel)
        {
            return element.FindResource("DispensingDataTemplate") as DataTemplate;
        }
        if (item is IDispenserSetsWorkplaceViewModel)
        {
            return element.FindResource("DispenserSetsWorkplaceTemplate") as DataTemplate;
        }
        if (item is IPaymentTypeCatalogViewModel)
        {
            return element.FindResource("PaymentTypeWorkplaceTemplate") as DataTemplate;
        }
        if (item is ICashManagementViewModel)
        {
            return element.FindResource("CashManagementTemplate") as DataTemplate;
        }
        if (item is ITerminalWorkplaceViewModel)
        {
            return element.FindResource("TerminalDataTemplate") as DataTemplate;
        }
        if (item is IPriceingWorkplaceViewModel)
        {
            return element.FindResource("PriceingDataTemplate") as DataTemplate;
        }
        return null;
    }
}

<local:TabDataTemplateSelector x:Key="tabDataTemplateSelector"/>
        <DataTemplate x:Key="TabContentTemplate">
            <telerik:RadBusyIndicator x:Name="rbiBusy" VerticalAlignment="Stretch" IsBusy="{Binding IsBusy}" HorizontalContentAlignment="Stretch" telerik:StyleManager.Theme="Windows8Touch" VerticalContentAlignment="Stretch">
                    <ContentPresenter  ContentTemplateSelector="{StaticResource tabDataTemplateSelector}"  Content="{Binding TabContentViewModel}" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"/>                    
            </telerik:RadBusyIndicator>               
        </DataTemplate>

Answer 1

Windows7和Windows8有点不同。我也遇到了同样的问题，我发现Windows8不支持DataTemplate的DataType属性，所以我不得不根据它们的名称选择它，并使用一个自定义的DataTemplateSelector。下面是我的代码的摘录，其中一个列表填充了不同的类型：

XAML：

<UserControl.Resources>
    <s:CustomDataTemplateSelector
        x:Key="CustomDataTemplateSelector" />
    <DataTemplate
        x:Key="Activity1">
        <c:ActivityControl1 />
    </DataTemplate>
  <DataTemplate
        x:Key="Activity2">
        <c:ActivityControl2 />
  </DataTemplate>
</UserControl.Resources>

<Grid>
    <ListView
        FontSize="20"
        BorderThickness="0"
        Foreground="Black"
        ItemsSource="{Binding Activities}"
        HorizontalContentAlignment="Stretch"
        ItemTemplateSelector="{StaticResource CustomDataTemplateSelector}" />
</Grid>

政务司司长：

public class CustomDataTemplateSelector : DataTemplateSelector
{
    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
    {
        string key = item.GetType().Name;
        FrameworkElement element = container as FrameworkElement;
        while (element != null)
        {
            if (element.Resources.ContainsKey(key))
                return element.Resources[key] as DataTemplate;
            element = VisualTreeHelper.GetParent(element) as FrameworkElement;
        }
        return Application.Current.Resources[key] as DataTemplate;
    }
}

希望这能有所帮助。

Answer 2

执行所需操作的标准方法是将每个DataTemplate放入一个UserControl中(不带DataTemplate对象，例如：只需添加内容)，将它们命名为...View (其中'...‘来自相关的视图模型类)，并使用App.xaml中定义的DataTemplate将它们连接到视图模型。

<DataTemplate DataType="{x:Type ViewModels:PetrochemicalCatalogViewModel}">
    <Views:PetrochemicalCatalogView />
</DataTemplate>
<DataTemplate DataType="{x:Type ViewModels:FuelPriceViewModel}">
    <Views:FuelPriceView />
</DataTemplate>
...
<DataTemplate DataType="{x:Type ViewModels:IPriceingWorkplaceViewModel}">
    <Views:IPriceingWorkplaceView />
</DataTemplate>