如何在dotnet核心中动态加载程序集

我正在构建一个Web应用程序，我想要单独关注，即在不同的项目中进行抽象和实现。

为了实现这一点，我尝试实现一个组合根概念，其中所有实现必须有一个ICompositionRootComposer实例来注册服务，类型等。

 public interface ICompositionRootComposer { void Compose(ICompositionConfigurator configurator); } 

在构建层次结构中直接引用的项目中，将调用ICompositionRootComposer实现，并在基础IoC容器中正确注册服务。

当我尝试在项目中注册服务时出现问题，我在其中设置了一个后期构建任务，将构建的dll复制到Web项目的调试文件夹：

 cp -R $(TargetDir)"assembly and symbol name"* $(SolutionDir)src/"webproject path"/bin/Debug/netcoreapp1.1 

我正在加载程序集:(灵感： 如何在.net核心控制台应用程序中加载位于文件夹中的程序集 ）

 internal class AssemblyLoader : AssemblyLoadContext { private string folderPath; internal AssemblyLoader(string folderPath) { this.folderPath = Path.GetDirectoryName(folderPath); } internal Assembly Load(string filePath) { FileInfo fileInfo = new FileInfo(filePath); AssemblyName assemblyName = new AssemblyName(fileInfo.Name.Replace(fileInfo.Extension, string.Empty)); return this.Load(assemblyName); } protected override Assembly Load(AssemblyName assemblyName) { var dependencyContext = DependencyContext.Default; var ressource = dependencyContext.CompileLibraries.FirstOrDefault(r => r.Name.Contains(assemblyName.Name)); if(ressource != null) { return Assembly.Load(new AssemblyName(ressource.Name)); } var fileInfo = this.LoadFileInfo(assemblyName.Name); if(File.Exists(fileInfo.FullName)) { Assembly assembly = null; if(this.TryGetAssemblyFromAssemblyName(assemblyName, out assembly)) { return assembly; } return this.LoadFromAssemblyPath(fileInfo.FullName); } return Assembly.Load(assemblyName); } private FileInfo LoadFileInfo(string assemblyName) { string fullPath = Path.Combine(this.folderPath, $"{assemblyName}.dll"); return new FileInfo(fullPath); } private bool TryGetAssemblyFromAssemblyName(AssemblyName assemblyName, out Assembly assembly) { try { assembly = Default.LoadFromAssemblyName(assemblyName); return true; } catch { assembly = null; return false; } } } 

有了这个，我就可以加载程序集并调用项目ICompositionRootComposer实现。

但问题是它似乎没有认出我的任何类型。

用来调用我的配置器时

 configurator.RegisterTransiantService(); 

它应该在IoC中注册IFoo和Foo。
但是在调试时我无法获取类型的信息，即通过Visual Studio Code中调试控制台中的typeof（Foo）。

 namespace System.Reflection { public class Assembly2 { public static System.Reflection.Assembly LoadFile(string path) { System.Reflection.Assembly ass = null; #if NET_CORE // Requires nuget - System.Runtime.Loader ass = System.Runtime.Loader.AssemblyLoadContext.Default .LoadFromAssemblyPath(path); #else ass = System.Reflection. Assembly.LoadFile(path); #endif // System.Type myType = ass.GetType("Custom.Thing.SampleClass"); // object myInstance = Activator.CreateInstance(myType); return ass; } } } 

 public void ConfigureServices(IServiceCollection services) { var myAssembly = LoadAssembly(); // find first interface var firstInterfaceType = myAssembly.DefinedTypes.FirstOrDefault(t => t.IsInterface).GetType(); // find it's implementation var firstInterfaceImplementationType = myAssembly.DefinedTypes.Where(t => t.ImplementedInterfaces.Contains(firstInterfaceType)).GetType(); // get general method info MethodInfo method = typeof(IServiceCollection).GetMethod("AddTransient"); // provide types to generic method MethodInfo generic = method.MakeGenericMethod(firstInterfaceType, firstInterfaceImplementationType); // register your types generic.Invoke(services, null); }