概述
在程序中实现模块化可以加快开发效率，通过替换模块实现升级.
架构
vnext 没有 Virtualpathprovider，本文通过IFileProvider实现模块
ModularVNext.Startup 启动类
public class Startup
{
private IFileProvider _modulesFileProvider;
private readonly string ApplicationBasePath;
private readonly IAssemblyLoadContextAccessor _assemblyLoadContextAccessor;
private readonly IAssemblyLoaderContainer _assemblyLoaderContainer;
public Startup(IHostingEnvironment hostingEnvironment,
IApplicationEnvironment applicationEnvironment,
IAssemblyLoaderContainer assemblyLoaderContainer,
IAssemblyLoadContextAccessor assemblyLoadContextAccessor)
{
//程序集加载上下文访问
_assemblyLoadContextAccessor = assemblyLoadContextAccessor;
//程序集加载容器
_assemblyLoaderContainer = assemblyLoaderContainer;
//程序基本路径
ApplicationBasePath = applicationEnvironment.ApplicationBasePath;
Configuration = new Configuration()
.AddJsonFile("config.json")
.AddEnvironmentVariables();
}
public IConfiguration Configuration { get; set; }
public void ConfigureServices(IServiceCollection services)
{
var basePaths = Configuration.Get("additionalFileProviderBasePaths")?.Split(‘;‘) ?? new string[] { };
var modulesPath = Path.Combine(ApplicationBasePath.Substring(0,ApplicationBasePath.IndexOf("src")), Configuration.Get("moduleLoadPath"));
var moduleAssemblies = LoadAssembliesFrom(modulesPath, _assemblyLoaderContainer, _assemblyLoadContextAccessor);
_modulesFileProvider = GetModulesFileProvider(basePaths, moduleAssemblies);
services.AddInstance(Configuration);
services.AddMvc();
services.Configure<RazorViewEngineOptions>(o =>
{
o.FileProvider = _modulesFileProvider;
});
services.AddInstance(new ModuleAssemblyLocator(moduleAssemblies));
services.AddTransient<DefaultAssemblyProvider>();
services.AddTransient<IAssemblyProvider, ModuleAwareAssemblyProvider>();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerfactory)
{
loggerfactory.AddConsole();
if (string.Equals(env.EnvironmentName, "Development", StringComparison.OrdinalIgnoreCase))
{
app.UseBrowserLink();
app.UseErrorPage(ErrorPageOptions.ShowAll);
}
else
{
app.UseErrorHandler("/Home/Error");
}
app.UseStaticFiles(new StaticFileOptions
{
FileProvider = _modulesFileProvider
});
app.UseMvc(routes =>
{
routes.MapRoute(
name: "areaRoute",
template: "{area:exists}/{controller}/{action}",
defaults: new { controller = "Home", action = "Index" }
);
routes.MapRoute(
name: "default",
template: "{controller}/{action}/{id?}",
defaults: new { controller = "Home", action = "Index" });
});
}
private List<Assembly> LoadAssembliesFrom(string modulesDirectory,
IAssemblyLoaderContainer assemblyLoaderContainer,
IAssemblyLoadContextAccessor loadContextAccessor)
{
var assemblies = new List<Assembly>();
var loadContext = _assemblyLoadContextAccessor.GetLoadContext(typeof(Startup).GetTypeInfo().Assembly);
using (assemblyLoaderContainer.AddLoader(new DirectoryLoader(modulesDirectory, loadContext)))
{
foreach (var modulePath in Directory.EnumerateFiles(@"C:\Users\Administrator\Documents\Visual Studio 2015\Projects1\ModularVNext\artifacts\bin\Module1\Debug\dnx451", "*.dll"))
{
var name = Path.GetFileNameWithoutExtension(modulePath);
assemblies.Add(loadContext.Load(name));
}
}
return assemblies;
}
private IFileProvider GetModulesFileProvider(string[] basePaths, List<Assembly> moduleAssemblies)
{
var redirectedFileProviders = basePaths
.Select(path => Path.IsPathRooted(path) ? path : Path.Combine(ApplicationBasePath, path))
.Select(root => new PhysicalFileProvider(root)).ToList();
var resourceFileProviders = moduleAssemblies.Select(a => new SafeEmbeddedFileProvider(a)).ToList();
var redirectedFileProviders1= redirectedFileProviders.Select(x => x as IFileProvider);
var resourceFileProviders1= resourceFileProviders.Select(x => x as IFileProvider);
var co= redirectedFileProviders1.Concat<IFileProvider>(resourceFileProviders1).ToList();
IFileProvider rootProvider = new PhysicalFileProvider(ApplicationBasePath);
co.Add(rootProvider);
return new CompositeFileProvider(co);
}
}
ConfigureServices 方法主要是获取模块程序集和模块程序提供者
var moduleAssemblies = LoadAssembliesFrom(modulesPath, _assemblyLoaderContainer, _assemblyLoadContextAccessor);
通过LoadAssembliesFrom方法获取模块程序集
参数：
modulesPath 模块的路径
也就是 Module1的程序集路径
选择该选项，然后编译就可以输出程序集了
在根目录下\artifacts\bin\Module1\Debug\会产生两个程序集分别是 dnx451 和 dnxcore50 ，这里我选择的是dnx451
集体实现
private List<Assembly> LoadAssembliesFrom(string modulesDirectory,
IAssemblyLoaderContainer assemblyLoaderContainer,
IAssemblyLoadContextAccessor loadContextAccessor)
{
var assemblies = new List<Assembly>();
//程序集加载上下文
var loadContext = _assemblyLoadContextAccessor.GetLoadContext(typeof(Startup).GetTypeInfo().Assembly);
//添加程序集加载
using (assemblyLoaderContainer.AddLoader(new DirectoryLoader(modulesDirectory, loadContext)))
{
//找出文件夹下的程序集，我这里写的是硬编码
foreach (var modulePath in Directory.EnumerateFiles(@"C:\Users\Administrator\Documents\Visual Studio 2015\Projects1\ModularVNext\artifacts\bin\Module1\Debug\dnx451", "*.dll"))
{
var name = Path.GetFileNameWithoutExtension(modulePath);
//加载程序集
assemblies.Add(loadContext.Load(name));
}
}
return assemblies;
}
返回程序集在条用_modulesFileProvider 获取文件提供者然后把获取到的文件提供者设置到RazorViewEngineOptions
services.Configure<RazorViewEngineOptions>(o =>
{
o.FileProvider = _modulesFileProvider;
});
ModularVNext.Infrastructure.CompositeFileProvider这是实现IFileProvider的类
public class CompositeFileProvider : IFileProvider
{
//提供者目录
private List<IFileProvider> _fileProviders;
//触发器
private readonly Dictionary<string, TestFileTrigger> _fileTriggers =
new Dictionary<string, TestFileTrigger>(StringComparer.Ordinal);
public CompositeFileProvider(IEnumerable<IFileProvider> fileProviders)
{
_fileProviders = fileProviders.ToList();
}
public IDirectoryContents GetDirectoryContents(string subpath)
{
foreach (var fileProvider in _fileProviders)
{
//更具subpat获取目录
var contents = fileProvider.GetDirectoryContents(subpath);
if (contents != null && contents.Exists)
{
return contents;
}
}
return new NotFoundDirectoryContents();
}
public IFileInfo GetFileInfo(string subpath)
{
foreach (var fileProvider in _fileProviders)
{//更具subpat获取文件信息
var fileInfo = fileProvider.GetFileInfo(subpath);
if (fileInfo != null && fileInfo.Exists)
{
return fileInfo;
}
}
return new NotFoundFileInfo(subpath);
}
public IExpirationTrigger Watch(string filter)
{
//触发器
TestFileTrigger trigger;
trigger = new TestFileTrigger();
return trigger;
}
}
internal class TestFileTrigger : IExpirationTrigger
{
public bool ActiveExpirationCallbacks
{
get { return false; }
}
private CancellationToken Token { get; set; }
public bool IsExpired
{
get {
return false; }
}
public IDisposable RegisterExpirationCallback(Action<object> callback, object state)
{
return null;
}
}
没有对Module1引用
运行程序
时间： 2024-11-05 21:51:21