Asp.net Vnext 实现IView

概述

---

Iview定义很简单，就是根据View上下文和TextWriter对象实现对View的呈现。

实现

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实现IViewEngine

  public class TestViewEngine : IViewEngine
    {
        public ViewEngineResult FindPartialView(ActionContext context, string partialViewName)
        {

            //如果viewName等于partial-test-view 就采用 TestPartialView 
            if (string.Equals(partialViewName, "partial-test-view", StringComparison.Ordinal))
            {
                return ViewEngineResult.Found(partialViewName, new TestPartialView());
            }
            return ViewEngineResult.NotFound(partialViewName, new[] { partialViewName });
        }

        public ViewEngineResult FindView(ActionContext context, string viewName)
        {
            //如果viewName等于test-view 就采用 TestView 
            if (string.Equals(viewName, "test-view"))
            {
                return ViewEngineResult.Found(viewName, new TestView());
            }
            return ViewEngineResult.NotFound(viewName, new[] { viewName });
        }
    }

实现IView

   public class TestPartialView : IView
    {
        public string Path { get; set; }

        public async Task RenderAsync(ViewContext context)
        {
            //这里没有视图，就把 world 输出浏览器
            
            await context.Writer.WriteLineAsync("world");
        }
    }

 public class TestView : IView
    {
        public string Path { get; set; }

        public async Task RenderAsync(ViewContext context)
        {
        
            await context.Writer.WriteLineAsync("<img  src='"+context.ViewBag.Images + "' />");
        }
    }

控制器

 public class HomeController: Controller
        {
        public ViewResult Index()
        {
            return View();
        }
        public ViewResult TestView()

            {


            ViewBag.Images = "/images/ASP-NET-Banners-01.png";       
            return View("test-view");
       
            }
     
    }

启动类

 public class Startup
    {
       
        public void ConfigureServices(IServiceCollection services)
        {
         
            services.AddMvc()
                .ConfigureMvc(options =>
                {
                    //加入视图引擎
                    options.ViewEngines.Insert(0, typeof(TestViewEngine));
                });
            }

        public void Configure(IApplicationBuilder app)
        {
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }

运行

表达有限这里有一篇介绍的文章：http://www.cnblogs.com/artech/archive/2012/08/22/view-engine-01.html

源码下载http://pan.baidu.com/s/1qWOcZ0K