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：

　　

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1 2	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：

+ View Code?

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/// <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：

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/// <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：

+ View Code?

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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：

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[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; }   }

　　

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//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; }

　　

　

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1	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

　　

+ View Code?

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/// <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");             }         }     }

　　

 

+ View Code?

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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";  }

　　

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第四篇 基于.net搭建热插拔式web框架（RazorEngine实现）