mvc-自定义视图引擎

//自定义视图引擎的实质是把数据模型(moudle)和模板(View)转换成html页面，输出到客户端
public class MyView:IView
    {
        string _viewPath;
        public MyView(string viewPath)
        {
            this._viewPath = viewPath;
        }

        public void Render(ViewContext viewContext, System.IO.TextWriter writer)
        {
            // 获取视图文件的原始内容
            string rawContents = File.ReadAllText(_viewPath);

            // 根据自定义的规则解析原始内容
            string parsedContents = Parse(rawContents, viewContext.ViewData);

            // 呈现出解析后的内容
            writer.Write(parsedContents);
        }

        private string Parse(string contents,ViewDataDictionary viewData)
        {
            // 对 {##} 之间的内容作解析
            return Regex.Replace
            (
                contents,
                @"\{#(.+)#\}",
                p => GetMatch(p, viewData)
            );
        }
         protected virtual string GetMatch(Match m, ViewDataDictionary viewData)
        {
            if (m.Success)
            {
                // 获取匹配后的结果，即 ViewData 中的 key 值，并根据这个 key 值返回 ViewData 中对应的 value
                string key = m.Result("$1");
                if (viewData.ContainsKey(key))
                {
                    return viewData[key].ToString();
                }
            }

            return string.Empty;
        }
    }

    public class MyViewEngine:VirtualPathProviderViewEngine
    {
        public MyViewEngine()
        {
            //自定义View路径格式
            base.ViewLocationFormats = new string[] {
               "~/Views/{1}/{0}.my", "~/Views/Shared/{0}.my"
            };
        }

        protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)
        {
            return this.CreateView(controllerContext, partialPath, string.Empty);
        }

　　　　　//把请求转换成
        protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)
        {
            var physicalPath = controllerContext.HttpContext.Server.MapPath(viewPath);

            return new MyView(physicalPath);
        }
    }