Modular Web Application with ASP.NET Core

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(options => ? ? { ? ? ? ? options.ViewLocationExpanders.Add(new ModuleViewLocationExpander()); ? ? }); ``` ? ``` public class ModuleViewLocationExpander : IViewLocationExpander ? ? { ? ? ? ? private const string _moduleKey = "module"; ? ? ? ? ? public IEnumerable ExpandViewLocations(ViewLocationExpanderContext context,IEnumerable viewLocations) ? ? ? ? { ? ? ? ? ? ? if (context.Values.ContainsKey(_moduleKey)) ? ? ? ? ? ? { ? ? ? ? ? ? ? ? var module = context.Values[_moduleKey]; ? ? ? ? ? ? ? ? if (!string.IsNullOrWhiteSpace(module)) ? ? ? ? ? ? ? ? { ? ? ? ? ? ? ? ? ? ? var moduleViewLocations = new string[] ? ? ? ? ? ? ? ? ? ? { ? ? ? ? ? ? ? ? ? ? ? ?"/Modules/Modular.Modules." + module + "/Views/{1}/{0}.cshtml",? ? ? ? ? ? ? ? ? ? ? ?"/Modules/Modular.Modules." + module + "/Views/Shared/{0}.cshtml" ? ? ? ? ? ? ? ? ? ? }; ? ? ? ? ? ? ? ? ? ? ? viewLocations = moduleViewLocations.Concat(viewLocations); ? ? ? ? ? ? ? ? } ? ? ? ? ? ? } ? ? ? ? ? ? return viewLocations; ? ? ? ? } ? ? ? ? ? public void PopulateValues(ViewLocationExpanderContext context) ? ? ? ? { ? ? ? ? ? ? var controller = context.ActionContext.ActionDescriptor.DisplayName; ? ? ? ? ? ? var moduleName = controller.Split('.')[2]; ? ? ? ? ? ? if(moduleName != "WebHost") ? ? ? ? ? ? { ? ? ? ? ? ? ? ? context.Values[_moduleKey] = moduleName; ? ? ? ? ? ? } ? ? ? ? } ? ? } ``` 3. Each module contains a ModuleInitializer.cs where services for that module is registered ? ``` ?// Register dependency in modules ? ? var moduleInitializerInterface = typeof(IModuleInitializer); ? ? foreach(var module in modules) ? ? { ? ? ? ? // Register dependency in modules ? ? ? ? var moduleInitializerType = module.Assembly.GetTypes().Where(x => typeof(IModuleInitializer).IsAssignableFrom(x)).FirstOrDefault(); ? ? ? ? if(moduleInitializerType != null && moduleInitializerType != typeof(IModuleInitializer)) ? ? ? ? { ? ? ? ? ? ? var moduleInitializer = (IModuleInitializer)Activator.CreateInstance(moduleInitializerType); ? ? ? ? ? ? moduleInitializer.Init(services); ? ? ? ? } ? ? } ``` Please note that services within modules already registered by Autofac 4. And this is how I serve static files for modules ? ``` // Serving static file for modules foreach(var module in modules) { ? ? var wwwrootDir = new DirectoryInfo(Path.Combine(module.Path,"wwwroot")); ? ? if (!wwwrootDir.Exists) ? ? { ? ? ? ? continue; ? ? } ? ? ? app.UseStaticFiles(new StaticFileOptions() ? ? { ? ? ? ? FileProvider = new PhysicalFileProvider(wwwrootDir.FullName),? ? ? ? RequestPath = new PathString("/"+ module.SortName) ? ? }); } ``` 5. For Entity Framework Every domain entities need to inherit from Entity,then on the "OnModelCreating" method,we find them and register them to DbContext ? ``` ?private static void RegisterEntities(ModelBuilder modelBuilder,IEnumerable typeToRegisters) ? ? { ? ? ? ? var entityTypes = typeToRegisters.Where(x => x.GetTypeInfo().IsSubclassOf(typeof(Entity)) && !x.GetTypeInfo().IsAbstract); ? ? ? ? foreach (var type in entityTypes) ? ? ? ? { ? ? ? ? ? ? modelBuilder.Entity(type); ? ? ? ? } ? ? } ``` Sometimes,we might also need to do some custom mappings for our model,let take look at the sample below ? ``` public class ModuleACustomModelBuilder : ICustomModelBuilder ? ? { ? ? ? ? public void Build(ModelBuilder modelBuilder) ? ? ? ? { ? ? ? ? ? ? modelBuilder.Entity() ? ? ? ? ? ? ? ? .Property(x => x.Name).HasColumnName("TestName"); ? ? ? ? } ? ? } ``` All the classes that implement the ICustomModelBuilder will be hooked and called in the "OnModelCreating" of the ModularDbContext ? ``` ?private static void RegisterCustomMappings(ModelBuilder modelBuilder,IEnumerable typeToRegisters) ? ? { ? ? ? ? var customModelBuilderTypes = typeToRegisters.Where(x => typeof(ICustomModelBuilder).IsAssignableFrom(x)); ? ? ? ? foreach(var builderType in customModelBuilderTypes) ? ? ? ? { ? ? ? ? ? ? if (builderType != null && builderType != typeof(ICustomModelBuilder)) ? ? ? ? ? ? { ? ? ? ? ? ? ? ? var builder = (ICustomModelBuilder)Activator.CreateInstance(builderType); ? ? ? ? ? ? ? ? builder.Build(modelBuilder); ? ? ? ? ? ? } ? ? ? ? } ? ? } ``` 6. Strong typed view There is a known issue with 1.0.0 on how MVC finds compilation assemblies for class libraries. We can workaround by adding the modules assemblies to the list of compilation assemblies directly. ? ``` var mvcBuilder = services.AddMvc() ? ? .AddRazorOptions(o => ? ? { ? ? ? ? foreach (var module in modules) ? ? ? ? { ? ? ? ? ? ? o.AdditionalCompilationReferences.Add(MetadataReference.CreateFromFile(module.Assembly.Location)); ? ? ? ? } ? ? }); ``` Yeah,and now we are done. Please checkout the source code for more details. ? ? ? ?（编辑：李大同）

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