ControlTemplate或DataTemplate中的自定义资源字典

时间:2012-11-22 08:16:50

标签: wpf xaml datatemplate controltemplate resourcedictionary

编辑:使用标准.NET ResourceDictionary时也会出现此问题,并且在控件或数据模板中使用资源字典似乎存在问题。

我有一个自定义资源字典,遵循共享资源实例的常用方法。

http://softnotes.wordpress.com/2011/04/05/shared-resourcedictionary-for-silverlight/ http://www.wpftutorial.net/MergedDictionaryPerformance.html

public class SharedResourceDictionary : ResourceDictionary
{
    static readonly Dictionary<Uri, WeakReference<ResourceDictionary>> SharedDictionaries = new Dictionary<Uri, WeakReference<ResourceDictionary>>();

    Uri _sourceUri;

    public new Uri Source
    {
        get
        {
            // Behave like standard resource dictionary for IDE...
            if (VisualStudio.IsInDesignMode)
                return base.Source;

            return this._sourceUri;
        }
        set
        {
            // Behave like standard resource dictionary for IDE...
            if (VisualStudio.IsInDesignMode)
            {
                base.Source = value;
                return;
            }

            this._sourceUri = value;

            WeakReference<ResourceDictionary> cached;
            if (SharedDictionaries.TryGetValue(value, out cached))
            {
                ResourceDictionary rd;
                if (cached.TryGetTarget(out rd))
                {
                    this.MergedDictionaries.Add(rd);
                    return;
                }
            }

            base.Source = value;
            SharedDictionaries[value] = new WeakReference<ResourceDictionary>(this);
        }
    }
}

它工作正常,但只要在ControlTemplate或DataTemplate中的Resources元素内引用它,就会显示虚假错误(这些不会影响构建,但仍会成功)。

这个显示标准ResourceDictionary,其中包含SharedResourceDictionary在其合并的词典中:

Unable to cast object of type 'Microsoft.Expression.Markup.DocumentModel.DocumentCompositeNode' to type 'System.Windows.ResourceDictionary'

示例XAML:

<DataTemplate DataType="{x:Type vm:MyViewModel}">
    <DockPanel Style="{DynamicResource MainDockPanel}">
        <DockPanel.Resources>
            <ResourceDictionary>
                <ResourceDictionary.MergedDictionaries>
                    <p:SharedResourceDictionary Source="/MyAssembly;component/MyResources.xaml" />
                </ResourceDictionary.MergedDictionaries>
            </ResourceDictionary>
        </DockPanel.Resources>
    </DockPanel>
</DataTemplate>

有没有人有任何想法如何消除这种滋扰错误?

由于

1 个答案:

答案 0 :(得分:0)

此问题已报告给Microsoft。您可以对其进行投票,因此可能会在将来的某个版本中修复。

https://connect.microsoft.com/VisualStudio/feedback/details/772730/xaml-designer-broken-when-adding-resource-dictionaries-to-data-or-control-templates