.NET 8 MEF插件加载原生依赖时遇DllNotFoundException问题求助

我有一个采用MEF（System.Composition）作为插件架构的.NET 8.0应用，大部分插件运行正常，但有两个插件会在运行时抛出异常。这两个插件的共同点是依赖使用runtime目录中原生DLL的库：

• 一个依赖Microsoft.Web.WebView2
• 另一个依赖使用Skia的LiveCharts2

以LiveCharts插件为例，其runtime目录结构如下：

runtimes
|-- osx
|   `-- native
|       |-- libHarfBuzzSharp.dylib
|       `-- libSkiaSharp.dylib
|-- win-arm64
|   `-- native
|       |-- libHarfBuzzSharp.dll
|       `-- libSkiaSharp.dll
|-- win-x64
|   `-- native
|       |-- libHarfBuzzSharp.dll
|       `-- libSkiaSharp.dll
`-- win-x86
    `-- native
        |-- libHarfBuzzSharp.dll
        `-- libSkiaSharp.dll

WebView插件的目录结构相同，仅DLL文件不同。该runtime目录位于插件项目的构建目录中，与插件DLL同级。

目前可通过将WebView2、Skia等依赖项移入宿主应用解决问题，但这种方式扩展性差——未来任何使用原生库的插件都需要修改宿主添加对应依赖，显然不够理想。

当宿主应用未包含Skia时，LiveCharts插件会抛出以下异常：

DllNotFoundException: Unable to load DLL 'libSkiaSharp' or one of its dependencies: The specified module could not be found. (0x8007007E)

现有插件加载代码如下：

初始化MEF容器代码 #

private void Init(IEnumerable<Assembly> assemblies)
{
    _pluginManager.ImportsSatisfied += OnImportsSatisfied;

    var configuration = new ContainerConfiguration()
        .WithAssemblies(assemblies);

    try
    {
        using (CompositionHost host = configuration.CreateContainer())
        {
            host.SatisfyImports(_pluginManager);
        }
    }
    catch (ReflectionTypeLoadException ex)
    {
        Log.Error("Could not load extension pluginNames: {0}\nLoader exceptions:{1} ", ex, ex.LoaderExceptions);
    }
    catch (Exception ex)
    {
        Log.Error("Could not load extension pluginNames: {0}", ex);
    }
}

加载插件程序集代码 #

private static IEnumerable<Assembly> GetAssembliesFromNames(IEnumerable<string> pluginNames, string pluginDirectory)
{
    List<Assembly> assemblies = new();
    foreach (string pluginName in pluginNames)
    {
        try
        {
            assemblies.Add(GetAssemblyForPluginByName(pluginName, pluginDirectory));
        }
        catch (Exception ex)
        {
            Log.Error("Could not load plugin assembly {0}: {1}", pluginName, ex);
        }
    }
    return assemblies;
}
public static Assembly GetAssemblyForPluginByName(string name, string workingDirectory)
{
    string pluginName = Path.GetFileName(name);
    string pluginFolderFilePath = Path.Combine(workingDirectory, pluginName);
    string pluginDllPath = Path.Combine(pluginFolderFilePath, pluginName + ".dll");
    if (Directory.Exists(pluginFolderFilePath) && File.Exists(pluginDllPath))
    {
        return Assembly.LoadFrom(pluginDllPath);
    }

    throw new FileNotFoundException(name);
}

现寻求无需将原生依赖移入宿主即可解决该加载异常的方案。

内容的提问来源于stack exchange，提问作者PowermacFan