ControlTemplate或DataTemplate中的自定义资源字典

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问题描述

使用标准的.NET ResourceDictionary时也会发生此问题，并且在控制或数据模板中使用资源字典时似乎会出现问题.

我有一个自定义资源字典，它遵循一种共享资源实例的通用方法.

I have a custom resource dictionary that follows a common approach to sharing resource instances.

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，但是只要在ControlTemplate或DataTemplate中的Resources元素内引用它，就会显示虚假错误(这些错误不会影响生成，但仍会成功).

It works fine, but whenever it is referenced inside a Resources element within a ControlTemplate or DataTemplate, there are spurious errors shown (these do not affect the build, which still succeeds).

此示例显示为标准ResourceDictionary，该标准ResourceDictionary在合并的词典中包含SharedResourceDictionary:

This one gets shown for the standard ResourceDictionary which contains SharedResourceDictionary in its merged dictionaries:

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>

有人知道如何消除这种讨厌的错误吗?

Does anyone have any ideas how I can eliminate this nuisance error?

谢谢

ResourceDictionary

ControlTemplate或DataTemplate中的自定义资源字典

问题描述

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