MEF - 从嵌入式 DLL 获取程序集

Question

我正在使用 MEF 为我的 WPF 应用程序创建“插件”。其中一些插件我想直接嵌入到 EXE 文件中，因为 EXE 需要是独立的。我正在使用 Fody 的 Costura 将资源与我的所有其他参考一起嵌入。由于 exe 文件需要独立，我无法为这些插件创建目录并使用 DirectoyCatalog

无论如何我可以从嵌入式资源加载程序集，或者简单地指定程序集名称，例如：

catalog.Catalogs.Add(new AssemblyCatalog("My.Assembly.Name));

我曾尝试遍历 Manifest 资源，但这些资源似乎已被 Fody 压缩：

var resourceNames = GetType().Assembly.GetManifestResourceNames();
            foreach (var resourceName in resourceNames)

感谢任何帮助/建议。

Answer 1

好的，这对我有用，使用下面的类（在https://github.com/Sebazzz/EntityProfiler/blob/master/src/UI/EntityProfiler.Viewer/AppBootstrapper.cs 找到此代码并进行调整以满足我的需要）：

要使用它，您只需调用 extract 函数，该函数将在资源清单中找到任何 Costura Zip 文件并将其解压缩并注册。

函数返回与函数中传递的字符串匹配的所有程序集的字典。然后我遍历它们并添加到目录以供组合容器使用：

var assemblies = CosturaAssemblyExtractor.Extract(AppDomain.CurrentDomain, Assembly.GetExecutingAssembly(), "My.AssemblyName");
foreach (var assembly in assemblies)
{
    catalog.Catalogs.Add(new AssemblyCatalog(assembly.Value));
}
container = new CompositionContainer(catalog);

类：

public static class CosturaAssemblyExtractor
{
    public static Dictionary<string, Assembly> Extract(AppDomain OrigDomain, Assembly ExecutingAssembly, string AssemblyStartsWith)
    {
        //var currentDomain = origDomain;
        var assemblies = OrigDomain.GetAssemblies();

        var references = new Dictionary<string, Assembly>();

        var manifestResourceNames = ExecutingAssembly.GetManifestResourceNames().Where(x => {
            return x.ToUpper().StartsWith(("costura." + AssemblyStartsWith).ToUpper()) && x.ToUpper().EndsWith(".dll.zip".ToUpper());
        });

        foreach (var resourceName in manifestResourceNames)
        {
            var solved = false;
            foreach (var assembly in assemblies)
            {
                var refName = string.Format("costura.{0}.dll.zip", GetDllName(assembly, true));
                if (resourceName.Equals(refName, StringComparison.OrdinalIgnoreCase))
                {
                    references[assembly.FullName] = assembly;
                    solved = true;
                    break;
                }
            }

            if (solved)
                continue;

            using (var resourceStream = ExecutingAssembly.GetManifestResourceStream(resourceName))
            {
                if (resourceStream == null) continue;

                if (resourceName.EndsWith(".dll.zip"))
                {
                    using (var compressStream = new DeflateStream(resourceStream, CompressionMode.Decompress))
                    {
                        var memStream = new MemoryStream();
                        CopyTo(compressStream, memStream);
                        memStream.Position = 0;

                        var rawAssembly = new byte[memStream.Length];
                        memStream.Read(rawAssembly, 0, rawAssembly.Length);
                        var reference = Assembly.Load(rawAssembly);
                        references[reference.FullName] = reference;
                    }
                }
                else
                {
                    var rawAssembly = new byte[resourceStream.Length];
                    resourceStream.Read(rawAssembly, 0, rawAssembly.Length);
                    var reference = Assembly.Load(rawAssembly);
                    references[reference.FullName] = reference;
                }
            }
        }
        return references;
    }

    private static void CopyTo(Stream source, Stream destination)
    {
        var array = new byte[81920];
        int count;
        while ((count = source.Read(array, 0, array.Length)) != 0)
        {
            destination.Write(array, 0, count);
        }
    }

    private static string GetDllName(Assembly assembly, bool withoutExtension = false)
    {
        var assemblyPath = assembly.CodeBase;
        return withoutExtension ? Path.GetFileNameWithoutExtension(assemblyPath) : Path.GetFileName(assemblyPath);
    }
}

Answer 2

只需从当前 AppDomain 加载程序集，我就可以让它在我的项目中工作。

foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
{
    catalog.Catalogs.Add(new AssemblyCatalog(assembly));
}