c# - 合并资源字典

Question

我正在尝试在后面的代码中合并 wpf 资源字典，但由于某些原因，这不起作用。例如，如果我尝试在文档本身上合并词典，它正在运行:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication212;assembly=WpfApplication212">

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="Theme.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>

<Style TargetType="{x:Type local:URComboBox}" BasedOn="{StaticResource ComboBoxStyle}">
</Style>

这是有效的，但如果我评论 ResourceDictionary.MergedDictionaries 并在代码中试试这个:

ResourceDictionary skin = new ResourceDictionary();
skin.Source = styleLocation;
ResourceDictionary skinFather = new ResourceDictionary();
skinFather.MergedDictionaries.Add(skin);
skinFather.Source = styleLocationFather;

这会因为找不到资源而中断。

Answer 1

您不能使用 Source 属性从代码中加载资源字典。

来自 MSDN :

"Merged dictionaries can be added to a Resources dictionary through code. The default, initially empty ResourceDictionary that exists for any Resources property also has a default, initially empty MergedDictionaries collection property. To add a merged dictionary through code, you obtain a reference to the desired primary ResourceDictionary, get its MergedDictionaries property value, and call Add on the generic Collection that is contained in MergedDictionaries. The object you add must be a new ResourceDictionary. In code, you do not set the Source property. Instead, you must obtain a ResourceDictionary object by either creating one or loading one. One way to load an existing ResourceDictionary to call XamlReader.Load on an existing XAML file stream that has a ResourceDictionary root, then casting the XamlReader.Load return value to ResourceDictionary."

因此，一些伪代码:

ResourceDictionary myResourceDictionary = XamlReader.Load(someXamlStreamReader);
anotherResourceDictionary.MergedDictionaries.Add(myResourceDictionary);

Here is another example如何做到这一点:

Uri uri = new Uri("/PageResourceFile.xaml", UriKind.Relative);
StreamResourceInfo info = Application.GetResourceStream(uri);
System.Windows.Markup.XamlReader reader = new System.Windows.Markup.XamlReader();
Page page = (Page)reader.LoadAsync(info.Stream);