第三篇 基于.net搭建热插拔式web框架（重造Controller）

　　由于.net MVC 的controller 依赖于HttpContext，而我们在上一篇中的沙箱模式已经把一次http请求转换为反射调用，并且http上下文不支持跨域，所以我们要重造一个controller。

　　我们在写mvc项目的时候经常会用到ViewBag、ViewData，那我们就先声明这两个变量：

　　

public dynamic ViewBag = new DynamicViewBag();
public ViewDataDictionary ViewData = new ViewDataDictionary();

　　当然还可以根据自己的需要构建更多的特性。

　　我们在一个网络请求中避免不了会携带一些参数，那这些参数该如何传到沙箱中呢？我们定义了一个RefRequestEntity类，他负责对我们的参数经行打包，把参数打包后对象作为参数传到沙箱内部：

/// <summary>用户的请求信息
    /// </summary>
    [Serializable]
    public class RefRequestEntity
    {
        /// <summary>当前用户在本页面具备的所有权限
        /// </summary>
        public List<RightEntity> PageRights;
        /// <summary>用户请求携带的所有参数
        /// </summary>
        public HuberRequest<string, object> Request;
        /// <summary>
        /// 用户id
        /// </summary>
        public string UserID { get; set; }
        public RefRequestEntity()
        {
            PageRights = new List<RightEntity>();
            Request = new HuberRequest<string, object>();
        }
    }

　　

　　在.net mvc中我们可以返回ActionResult，在ActionResult内部调用时才会做出真正的Response（更多细节请参考mvc实现原理），当然它在执行的整个过程中都是由HttpContext贯穿的，我们没有了HttpContext，我们就只自己构造一些Response方法。

　　返回View()结果:

　　mvc中由ViewEngine来编译执行我们写好的视图文件（.aspx、.cshtml）,而我们则借助于RazorEngine来编译执行razor视图文件，它可以支持我们常用的ViewBag、using、layout等（更多请见RazorEngine）。在本篇中我们还是把精力放回controller的实现中，关于视图的实现我们在下一篇中在讲。我们先看一下一个View的简单实现：

/// <summary>返回试图的执行结果
        /// </summary>
        /// <returns></returns>
        protected string View()
        {
            var tKey = Engine.Razor.GetKey(getActionPath(), ResolveType.Global);//getActionPath：获取action对应的视图文件key值。

　　　　　　　return new CompileView().RunCompile(tKey, null, null, ViewBag); //返回执行结果
　　　　 }

　　View()的执行结果是一段html代码。这样我们在请求一个action的时候，就可以正常的呈现一个页面了。下边是一个Controller基类的实现，它完成了View、PartialView的实现Demo：

public class HuberController
    {

        public dynamic ViewBag = new DynamicViewBag();
        public ViewDataDictionary ViewData = new ViewDataDictionary();

        /// <summary>设置ViewBag的值
        /// </summary>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        internal void AddViewBageValues(string key, object value)
        {

            Impromptu.InvokeSet(ViewBag, key, value);

        }

        /// <summary>返回试图的执行结果
        /// </summary>
        /// <returns></returns>
        protected string View()
        {
            var tKey = Engine.Razor.GetKey(getActionPath(), ResolveType.Global);
            return new CompileView().RunCompile(tKey, null, null, ViewBag);
        }
        /// <summary>返回试图的执行结果
        /// </summary>
        /// <typeparam name="T">model的类型</typeparam>
        /// <param name="model">model</param>
        /// <returns></returns>
        protected string View<T>(T model)
        {
            var tKey = Engine.Razor.GetKey(getActionPath(), ResolveType.Global);
            return new CompileView().RunCompile(tKey, typeof(T), model, ViewBag);
        }
        /// <summary>返回试图的执行结果
        /// </summary>
        /// <param name="viewName">视图的全路径（相对于运行目录的全路径）</param>
        /// <returns></returns>
        protected string View(string viewName)
        {
            var tKey = Engine.Razor.GetKey(getActionPathWith(viewName), ResolveType.Global);
            return new CompileView().RunCompile(tKey, null, null, ViewBag);
        }
        /// <summary>返回试图的执行结果
        /// </summary>
        /// <typeparam name="T">model的类型</typeparam>
        /// <param name="viewName">视图的全路径（相对于运行目录的全路径）</param>
        /// <param name="model">model</param>
        /// <returns></returns>
        protected string View<T>(string viewName, T model)
        {
            var tKey = Engine.Razor.GetKey(getActionPathWith(viewName), ResolveType.Global);
            return new CompileView().RunCompile(tKey, typeof(T), model, ViewBag);
        }

        /// <summary>返回局部试图的执行结果
        /// </summary>
        /// <returns></returns>
        protected string PartialView()
        {
            var tKey = Engine.Razor.GetKey(getActionPath(), ResolveType.Include);
            return new CompileView().RunCompile(tKey, null, null, ViewBag);
        }
        /// <summary>返回局部试图的执行结果
        /// </summary>
        /// <typeparam name="T">model的类型</typeparam>
        /// <param name="model">model</param>
        /// <returns></returns>
        protected string PartialView<T>(T model)
        {
            var tKey = Engine.Razor.GetKey(getActionPath(), ResolveType.Include);
            return new CompileView().RunCompile(tKey, typeof(T), model, ViewBag);
        }
        /// <summary>返回局部试图的执行结果
        /// </summary>
        /// <param name="viewName">视图的全路径（相对于运行目录的全路径）</param>
        /// <returns></returns>
        protected string PartialView(string viewName)
        {
            var tKey = Engine.Razor.GetKey(getActionPathWith(viewName), ResolveType.Include);
            return new CompileView().RunCompile(tKey, null, null, ViewBag);
        }
        /// <summary>返回局部试图的执行结果
        /// </summary>
        /// <typeparam name="T">model的类型</typeparam>
        /// <param name="viewName">视图的全路径（相对于运行目录的全路径）</param>
        /// <param name="model">model</param>
        /// <returns></returns>
        protected string PartialView<T>(string viewName, T model)
        {
            var tKey = Engine.Razor.GetKey(getActionPathWith(viewName), ResolveType.Include);
            return new CompileView().RunCompile(tKey, typeof(T), model, ViewBag);
        }

        /// <summary>获取action对应view的物理文件地址
        /// </summary>
        /// <returns></returns>
        private string getActionPath()
        {
            string key = string.Empty;
            StackTrace trace = new StackTrace();
            MethodBase methodName = trace.GetFrame(2).GetMethod();
            string className = methodName.ReflectedType.FullName;

            string assName = HuberHttpModule.CurDomainAssemblyName;
            key = className.Substring(assName.Length);
            key = key.Replace(".Controllers.", ".Views.");
            key = key.Substring(0, key.Length - 10);
            key = key.Replace(".", "\\");
            key += "\\" + methodName.Name + ".cshtml";
            return key;
        }
        /// <summary>根据action名获取其对应view的物理文件地址
        /// </summary>
        /// <param name="ActionName">action名（同一controller中）</param>
        /// <returns></returns>
        private string getActionPathWith(string ActionName)
        {
            string key = string.Empty;
            StackTrace trace = new StackTrace();
            MethodBase methodName = trace.GetFrame(2).GetMethod();
            string className = methodName.ReflectedType.FullName;

            string assName = HuberHttpModule.CurDomainAssemblyName;
            key = className.Substring(assName.Length);
            key = key.Replace(".Controllers.", ".Views.");
            key = key.Substring(0, key.Length - 10);
            key = key.Replace(".", "\\");
            key += "\\" + ActionName + ".cshtml";
            return key;
        }
    }

　　　我们上边列出了对Razor编译执行的简单过程，还是那句话，RazorEngine的更多实现细节将在下一篇讲解。那么现在问题来了，我们得到了html代码或者说我们执行玩自己的业务逻辑以后如何把这个结果输出呢（即HttpResponse）？

　　我们定义了一个RefRespondEntity类，它来承载返回结果，并把结果返回到沙箱外层的调用者，再由这个调用者将这个RefRespondEntity对象Response出去：

  [Serializable]
    public class RefRespondEntity
    {
        public RefRespondEntity(RespondType type)
        {
            ResultType = type;
        }
        /// <summary>返回结果的数据类型
        /// </summary>
        public RespondType ResultType { get; set; }
        /// <summary>返回结果的内容
        /// 如果是ResultType=_Redirect那么ResultContext=301
        /// 如果是ResultType=_Stream那么ResultContext="文件名.zip",当然这个文件名可以随意定义
        /// </summary>
        public object ResultContext { get; set; }
        /// <summary>返回结果的文件流
        /// </summary>
        public byte[] ResultStream { get; set; }
    }

　　

        //一个action的demo
        public RefRespondEntity Index4(RefRequestEntity param)
        {

             object AA = param.Request["A"];
             object BB = param.Request["B"];
             object CC = param.Request["C"];

            RefRespondEntity result = new RefRespondEntity(RespondType._String);
            result.ResultContext = View();
            object tt =   ViewBag.test;
            return result;
        }

　　

　

var result = sandBox.InvokeMothod(urlEntity.controller, urlEntity.action, paras);//sandBox是一个沙箱的实例化对象

RequestHandle.ResposeResult(respond, result);//输出结果

　　

/// <summary>响应工具类
    /// </summary>
    public class RequestHandle
    {
        private static bool IsAjax(HttpRequest request)
        {
            return request.Headers["X-Requested-With"] != null;
        }

        /// <summary>将reques请求的参数封装到CorRefEntity对象中
        /// </summary>
        /// <param name="para"></param>
        /// <param name="request"></param>
        public static void FillCorRefEntity(RefRequestEntity para, HttpRequest request)
        {
            foreach (var key in request.Params.AllKeys)
            {
                para.Request.Add(key, request.Params[key]);

            }
        }
        /// <summary>URL404
        /// </summary>
        /// <param name="request"></param>
        /// <param name="respond"></param>
        public static void ResponseNotfound(HttpRequest request, HttpResponse respond)
        {
            if (IsAjax(request))
            {
                respond.Write(ResponseCodeEntity.CODE404);
                respond.End();
            }
            else
            {
                respond.Redirect(ResponseCodeEntity.ULR404);
                respond.End();
            }
        }
        /// <summary>NoLogin
        /// </summary>
        /// <param name="request"></param>
        /// <param name="respond"></param>
        public static void ResponseNoLogin(HttpRequest request, HttpResponse respond)
        {
            if (IsAjax(request))
            {
                respond.Write(ResponseCodeEntity.NoLogin);
                respond.End();
            }
            else
            {
                respond.Redirect(ResponseCodeEntity.LoginURL);//需要改成非调转形式
                respond.End();
            }
        }
        /// <summary>NoRight
        /// </summary>
        /// <param name="request"></param>
        /// <param name="respond"></param>
        public static void ResponseNoRight(HttpRequest request, HttpResponse respond)
        {
            if (IsAjax(request))
            {
                respond.Write(ResponseCodeEntity.NoRight);
                respond.End();
            }
            else
            {
                respond.Redirect(ResponseCodeEntity.NoRightURL);//需要改成非调转形式
                respond.End();
            }
        }

        public static void ResposeResult(HttpResponse respond, object result)
        {
            if (typeof(RefRespondEntity) == result.GetType())
            {
                RefRespondEntity temp_result = (RefRespondEntity)result;
                if (temp_result.ResultType == RespondType._Redirect)
                {
                    respond.Redirect((string)temp_result.ResultContext);
                    respond.End();
                }
                else if (temp_result.ResultType == RespondType._Stream)
                {
                    byte[] st = (byte[])temp_result.ResultStream;
                    respond.ContentType = "application/octet-stream";
                    respond.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", (string)temp_result.ResultContext));
                    respond.OutputStream.Write(st, 0, st.Length);
                    respond.End();
                }
                else
                {
                    respond.Write(temp_result.ResultContext);
                    respond.End();
                }
            }
            else
            {
                respond.Write("Huber Module respose is not a RefRespondEntity");
            }
        }
    }

　　

   public class ResponseCodeEntity
    {
        /// <summary>404
        /// </summary>
        public static string ULR404 = "/NotPageFound/_404";
        /// <summary>404ajax
        /// </summary>
        public static string CODE404 = "NotPage";
        /// <summary>登录页URL
        /// </summary>
        public static string LoginURL = "/User/Login";
        /// <summary>未登录ajax
        /// </summary>
        public static string NoLogin = "NoLogin";
        /// <summary>没有权限ajax
        /// </summary>
        public static string NoRight = "NoRight";
        /// <summary>没有权限url
        /// </summary>
        public static string NoRightURL = "/User/NoRight";
    }

　　

转载请注明出处：http://www.cnblogs.com/eric-z/p/5047172.html第四篇 基于.net搭建热插拔式web框架（RazorEngine实现）