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）
