[技术散分]Asp.Net表示层议案(借助NVelocity模板引擎)

using System;using System.IO;using System.Web;using System.Text;using System.Collections;using NVelocity;using NVelocity.App;using NVelocity.Context;using NVelocity.Runtime;using Commons.Collections;namespace AspNet.App.UI{    public abstract class BaseHandler : IHttpHandler    {        private static readonly VelocityEngine viewEngine = new VelocityEngine();         static BaseHandler()        {            //TODO:这里的硬编码可以改成配置文件的方式            ExtendedProperties extend = new ExtendedProperties();            extend.AddProperty(RuntimeConstants.COUNTER_NAME, "i");            extend.AddProperty(RuntimeConstants.RESOURCE_LOADER, "file");            extend.AddProperty(RuntimeConstants.INPUT_ENCODING, "utf-8");            extend.AddProperty(RuntimeConstants.OUTPUT_ENCODING, "utf-8");                        string appPath = AppDomain.CurrentDomain.BaseDirectory;            extend.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, appPath);            //模板的缓存设置            extend.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_CACHE, true);              //是否缓存            extend.AddProperty("file.resource.loader.modificationCheckInterval", (Int64)30);    //缓存时间(秒)            viewEngine.Init(extend);        }        public HttpContext HttpContext         {             get;             private set;         }        public HttpRequest Request         {             get;             private set;         }        public HttpResponse Response         {             get;             private set;         }        private Hashtable templateData = new Hashtable();        public Hashtable TemplateData        {            get { return templateData; }        }        private string templateFile = string.Empty;        public string TemplateFile         {             get { return templateFile; }            set { templateFile = value; }        }        public void ProcessRequest(HttpContext context)        {            this.HttpContext = context;            this.Request = context.Request;            this.Response = context.Response;            //此方法主要进行数据的获取            Handler_Load(this, EventArgs.Empty);            //输出            IContext ctx = new VelocityContext(templateData);            viewEngine.MergeTemplate(TemplateFile, "utf-8", ctx, context.Response.Output);        }        //局部文件的呈现        protected string Merge(Hashtable data, string fileName)        {            IContext ctx = new VelocityContext(data);            StringBuilder sb = new StringBuilder(512);            StringWriter writer = new StringWriter(sb);            viewEngine.MergeTemplate(fileName, "utf-8", ctx, writer);            return sb.ToString();        }        public abstract void Handler_Load(object sender, EventArgs e);        public bool IsReusable        {            get { return false; }        }    }}