一.前言
由于项目业务复杂,创建了多个插件并把他们放在了不同的项目中,项目使用AutoFac做的IOC;但是主项目可以注入,插件注入失败,
没有为该对象定义无参数的构造函数。下面就一步一步注入插件项目。
二.新建带有插件的项目
项目结构如下图:
三.建立DomainServices类库
新建一个ITestService接口,代码如下:
namespace DomainServices { public interface ITestService { string GetData(); string GetMainData(); } }
新建一个TestService类实现ITestService,代码如下:
namespace DomainServices { public class TestService:ITestService { public string GetData() { return "这是插件获取的Services数据"; } public string GetMainData() { return "这是主项目获取的Services数据"; } } }
四.autofac实现主项目注入和插件注入
1.主项目引用autofac、autofac.Integration.Mvc
工具->库程序包管理器->管理解决方案的NuGet程序包:
2.主项目新建一个AutoFacBootStrapper.cs类,实现autofac注入
代码如下:
using System.IO; using System.Linq; using System.Reflection; using System.Web; using System.Web.Mvc; using Autofac; using Autofac.Integration.Mvc; namespace Web { public class AutoFacBootStrapper { public static void AutoFacInit() { var builder = new ContainerBuilder(); //注册DomainServices var services = Assembly.Load("DomainServices"); builder.RegisterAssemblyTypes(services, services) .Where(t => t.Name.EndsWith("Service")) .AsImplementedInterfaces().PropertiesAutowired(); //实现插件Controllers注入 var assemblies = new DirectoryInfo( HttpContext.Current.Server.MapPath("~/App_Data/Plugins/")) .GetFiles("*.dll") .Select(r => Assembly.LoadFrom(r.FullName)).ToArray(); foreach (var assembly in assemblies) { builder.RegisterControllers(assembly).PropertiesAutowired(); } //注册主项目的Controllers builder.RegisterControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired(); var container = builder.Build(); DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); } } }
3.启用autofac注入,在Global程序Start的地方添加AutoFacBootStrapper.AutoFacInit();
using System.Web.Mvc; using System.Web.Optimization; using System.Web.Routing; namespace Web { public class MvcApplication : System.Web.HttpApplication { protected void Application_Start() { AreaRegistration.RegisterAllAreas(); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); //启用autofac注入 AutoFacBootStrapper.AutoFacInit(); } } }
五.测试autofac注入是否成功
1.主web的HomeController给出构造函数注入demo
using System.Web.Mvc; using DomainServices; namespace Web.Controllers { public class HomeController : Controller { //public ITestService Service { get; set; } ITestService _service; public HomeController(ITestService service) { _service = service; } public ActionResult Index() { ViewBag.Show = _service.GetMainData(); return View(); } } }
主项目的View代码:
@{ ViewBag.Title = "Home Page"; } <div class="jumbotron"> <h1>ASP.NET</h1> <p class="lead">ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS and JavaScript.</p> <p><a href="http://asp.net" class="btn btn-primary btn-large">Learn more »</a></p> </div> <div class="row"> <p>这里是autofac注入的主项目:@ViewBag.Show </p> @Html.ActionLink("Demo插件内容访问点击这里", "Index", "Home", new { area = "Demo" }, null) </div>
2.插件的HomeControllers给出一个属性注入demo
注意:autofac官网不建议使用属性注入,为了便于演示,我在AutoFacBootStrapper也加上了属性注入了。具体项目的时间建议使用构造函数注入的方式。
using System.Web.Mvc; using DomainServices; namespace Plugin.Demo.Controllers { public class HomeController : Controller { public ITestService Service { get; set; } public ActionResult Index() { ViewBag.Show=Service.GetData(); return View(); } } }
插件的View代码:
<div> <p>ASP.NET MVC 插件化:Plugin.Demo 内容</p> <p>autofac注入插件:@ViewBag.Show</p> </div>
3.重新生成插件,运行主项目,效果如下:
主项目页面autofac注入成功后调用DomainServices的数据如下:
插件:
时间: 2024-10-14 05:01:44