从其他Assembly实例化ResourceDictionary xaml

Question

我在包含颜色和画笔的WPF类库中定义了一个Reource Dictionary,名为BrushResources.xaml.

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Lots of Colors and Brushes here>
</ResourceDictionary>

我想在另一个程序集的代码中使用一些Brushes,它引用了这个库项目.如何获得它的实例ResourceDictionary？

Answer 1

您要问的是在应用程序中提供真正皮肤所需功能的组件.从单独的程序集中获取资源涉及从其他程序集中读取已编译的XAML或BAML.这是我在skinning库中使用的方法,用于从程序集中检索BAML:

//Relevant Namespaces:
//using System.Windows.Baml2006;
//using System.Xaml;

public static List<Stream> GetBamlStreams(AssemblyName skinAssemblyName) 
{ 
    List<Stream> bamlStreams = new List<Stream>(); 
    Assembly skinAssembly = Assembly.Load(skinAssemblyName); 
    string[] resourceDictionaries = skinAssembly.GetManifestResourceNames(); 
    foreach (string resourceName in resourceDictionaries) 
    { 
        ManifestResourceInfo info = skinAssembly.GetManifestResourceInfo(resourceName); 
        if (info.ResourceLocation != ResourceLocation.ContainedInAnotherAssembly) 
        { 
            Stream resourceStream = skinAssembly.GetManifestResourceStream(resourceName); 
            using (ResourceReader reader = new ResourceReader(resourceStream)) 
            { 
                foreach (DictionaryEntry entry in reader) 
                { 
                    //TODO: Figure out if this is a ResourceDictionary I care about
                    //Key will be name of the RD (BrushResources.baml, in your case)
                    if (IsRelevantResource(entry)) 
                    { 
                         bamlStreams.Add(entry.Value as Stream); 
                    } 
                } 
            } 
        } 
    } 
    return bamlStreams; 
}

然后,要将BAML转换为特定资源,请执行以下操作:

//If .NET 3.5, need this initialization:
//Type xamlType = typeof(System.Windows.Markup.XamlReader);
//LoadBamlMethod = xamlType.GetMethod(LOAD_BAML_METHOD, BindingFlags.NonPublic | BindingFlags.Static);

public static T LoadBaml<T>(Stream stream) 
{ 
    //For .net 3.5: 
    //ParserContext parserContext = new ParserContext(); 
    //object[] parameters = new object[] { stream, parserContext, null, false }; 
    //object bamlRoot = LoadBamlMethod.Invoke(null, parameters); 
    //return (T)bamlRoot; 

    //For .net 4.0
    var reader = new Baml2006Reader(stream); 
    var writer = new XamlObjectWriter(reader.SchemaContext); 
    while (reader.Read()) 
            writer.WriteNode(reader); 
    return (T)writer.Result; 
} 

并且为了将来自其他程序集的资源合并到当前程序集中:

private void LoadResources() 
{ 
    List<Stream> bamlStreams = GetBamlStreams(FullName); 
    foreach (Stream stream in bamlStreams) 
    { 
        ResourceDictionary rd = LoadBaml<ResourceDictionary>(stream);
        Application.Current.Resources.MergedDictionaries.Add(rd)
    } 
} 

此示例以非常通用的方式为蒙皮目的进行工作,但您可以简化此操作以在必要时实现您的特定目标.你可以在github上看到一个使用这个方法的皮肤库,并举几个例子来演示.