第四篇 基于.net搭建热插拔式web框架(RazorEngine实现)_html/css_WEB-ITnose
回顾上篇文章,我们重造了一个controller,这个controller中用到了视图引擎,我们的视图引擎虽然也叫Razor,但此Razor非mvc中的Razor,MVC中的Razor同样依赖于HttpContext,我们实现的Razor借用 RazorEngine 。关于 RazorEngine的更多介绍请参阅http://antaris.github.io/RazorEngine/。
在上篇文章中无论是View方法还是PartialView方法,都用到了CompileView对象,我们先来看一下 CompileView类的实现。
////// 视图编译类 /// public class CompileView { private static Regex layoutEx = new Regex("Layout\\s*=\\s*@?\"(\\S*)\";");//匹配视图中的layout static InvalidatingCachingProvider cache = new InvalidatingCachingProvider(); static FileSystemWatcher m_Watcher = new FileSystemWatcher(); static CompileView() { var config = new TemplateServiceConfiguration(); config.BaseTemplateType = typeof(HuberImplementingTemplateBase); config.ReferenceResolver = new HuberReferenceResolver(); config.CachingProvider = cache; cache.InvalidateAll(); Engine.Razor = RazorEngineService.Create(config); //添加文件修改监控,以便在cshtml文件修改时重新编译该文件 m_Watcher.Path = HuberVariable.CurWebDir; m_Watcher.IncludeSubdirectories = true; m_Watcher.Filter = "*.*"; m_Watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName; m_Watcher.Created += new FileSystemEventHandler(OnChanged); m_Watcher.Changed += new FileSystemEventHandler(OnChanged); m_Watcher.Deleted += new FileSystemEventHandler(OnChanged); m_Watcher.EnableRaisingEvents = true; } //当视图被修改后清除缓存 private static void OnChanged(object sender, FileSystemEventArgs e) { if (e.FullPath.EndsWith(".cshtml")) { string s = e.FullPath.Replace(HuberVariable.CurWebDir, "/"); var key = Engine.Razor.GetKey(s); cache.InvalidateCache(key); } } public CompileView() { } public string RunCompile(ITemplateKey key, Type modelType, object model, DynamicViewBag viewBag) { //判断唯一视图的缓存 string path = (HuberVariable.CurWebDir + key.Name).Replace(@"\\", @"\"); ICompiledTemplate cacheTemplate; cache.TryRetrieveTemplate(key, null, out cacheTemplate); if (cacheTemplate == null || !cacheTemplate.Key.Name.Trim().Equals(key.Name.Trim())) { CompileViewAndLayout(key, null, model, viewBag); } //当缓存存在返回结果 return Engine.Razor.RunCompile(key, null, model, viewBag); } ////// 编译视图和层layout /// /// 视图的唯一路径 /// 视图类型 :视图/layout /// 页面 MODEL /// viewBag public void CompileViewAndLayout(ITemplateKey key, Type modelType, object model, DynamicViewBag viewBag) { //获取视图 string FullPath = (HuberVariable.CurWebDir + key.Name.Replace("/", @"\")).Replace(@"\\", @"\"); string content = System.IO.File.ReadAllText(FullPath); //匹配layout var matchs = layoutEx.Matches(content); string layoutPath = string.Empty; if (matchs != null) { foreach (Match m in matchs) { layoutPath = m.Groups[1].Value; } } if (layoutPath != string.Empty) { //添加layout到模板 string FullLayoutPath = (HuberVariable.CurWebDir + layoutPath.Replace("/", @"\")).Replace(@"\\", @"\"); if (File.Exists(FullLayoutPath)) { ITemplateKey layoutKey = Engine.Razor.GetKey(layoutPath, ResolveType.Layout); CompileViewAndLayout(layoutKey, null, model, viewBag); } } if (key.TemplateType == ResolveType.Layout) { Engine.Razor.AddTemplate(key, content); } else { //编译视图 Engine.Razor.RunCompile(content, key, null, model); } } }
InvalidatingCachingProvider是RazorEngine对视图文件编译结果的一种缓存策略,RazorEngine提供的缓存策略还有DefaultCachingProvider,也可以自己实现一种缓存策略只要继承ICachingProvider。
HuberImplementingTemplateBase:我们自定义的一种Razor模板标签,如“@Html.Raw”,这个例子也可以在RazorEngine官方文档中找到。我们还可以按照规则定义更多用法,下边是我的一些实现:
1 ///页面帮助类 2 /// A simple helper demonstrating the @Html.Raw 3 /// 4 ///5 public class HuberImplementingTemplateBase : TemplateBase 6 { 7 /// 8 /// A simple helper demonstrating the @Html.Raw 9 /// 10 public HuberImplementingTemplateBase() 11 { 12 Html = new RazorHtmlHelper(); 13 } 14 15 ///16 /// A simple helper demonstrating the @Html.Raw 17 /// 18 /// 19 public RazorHtmlHelper Html { get; set; } 20 21 } 22 23 public class RazorHtmlHelper 24 { 25 26 ///27 /// 调用Action视图 28 /// 29 /// action方法名称 30 /// 控制器名称 31 ///32 public IEncodedString Action(string actionName, string controllerName) 33 { 34 return Action(actionName, controllerName, new { }); 35 36 } 37 38 /// 39 /// 调用Action视图 40 /// 41 /// 42 /// 43 /// 传入参数 44 ///45 public IEncodedString Action(string actionName, string controllerName, object routeValues) 46 { 47 RefRequestEntity paras = SetParamValue(routeValues); 48 49 var t = HuberHttpModule.CurDomainAssembly.GetType(HuberHttpModule.CurDomainAssemblyName + ".Controllers." + controllerName + "Controller"); 50 var m = t.GetMethod(actionName); 51 object dObj = Activator.CreateInstance(t); 52 object result = m.Invoke(dObj, new object[] { paras }); 53 return new RawString((result as RefRespondEntity).ResultContext.ToString()); 54 } 55 56 /// 57 /// 根据model设置传入参数 58 /// 59 /// 60 ///61 private static RefRequestEntity SetParamValue(object routeValues) 62 { 63 RefRequestEntity paras = new RefRequestEntity(); 64 65 Type t1 = routeValues.GetType(); 66 PropertyInfo[] pis = t1.GetProperties(); 67 foreach (PropertyInfo pi in pis) 68 { 69 paras.Request.Add(pi.Name, pi.GetValue(routeValues)); 70 71 } 72 return paras; 73 } 74 75 76 public IEncodedString RenderAction(string actionName, string controllerName) 77 { 78 return Action(actionName, controllerName, new { }); 79 } 80 81 public IEncodedString RenderAction(string actionName, string controllerName, object routeValues) 82 { 83 return Action(actionName, controllerName, routeValues); 84 } 85 86 public IEncodedString RenderPartial(string partialViewName, string controllerName) 87 { 88 return RenderPartial(partialViewName, controllerName, new { }, new DynamicViewBag()); 89 } 90 91 // Renders the partial view with the given view data and, implicitly, the given view data's model 92 public IEncodedString RenderPartial(string partialViewName, string controllerName, DynamicViewBag ViewBag) 93 { 94 return RenderPartial(partialViewName, controllerName, new { }, ViewBag); 95 } 96 97 // Renders the partial view with an empty view data and the given model 98 public IEncodedString RenderPartial(string partialViewName, string controllerName, object model) 99 {100 return RenderPartial(partialViewName, controllerName, model, new DynamicViewBag());101 }102 103 104 // Renders the partial view with a copy of the given view data plus the given model105 /// 106 /// 部分视图107 /// 108 /// 部分视图名称109 /// 控制器名称110 /// model111 /// ViewBag112 ///113 public IEncodedString RenderPartial(string partialViewName, string controllerName, object model, DynamicViewBag ViewBag)114 {115 116 117 RefRequestEntity paras = SetParamValue(model);118 119 var t = HuberHttpModule.CurDomainAssembly.GetType(HuberHttpModule.CurDomainAssemblyName + ".Controllers." + controllerName + "Controller");120 var ActionFunc = t.GetMethod(partialViewName);121 object dObj = Activator.CreateInstance(t);122 123 var AddViewBageFunc = t.GetMethod("AddViewBageValues");124 125 foreach (string key in ViewBag.GetDynamicMemberNames())126 {127 128 AddViewBageFunc.Invoke(dObj, new object[] { key, Impromptu.InvokeGet(ViewBag, key) });129 }130 131 object result = ActionFunc.Invoke(dObj, new object[] { paras });132 return new RawString((result as RefRespondEntity).ResultContext.ToString());133 }134 135 }View Code
HuberReferenceResolver:我们定义的Razor中用的类库依赖。
1 public class HuberReferenceResolver : IReferenceResolver 2 { 3 4 static ListcompilerReference; 5 static HuberReferenceResolver() 6 { 7 //加载本地所有类库,@using 使用 8 compilerReference = new List (); 9 IEnumerable loadedAssemblies = (new UseCurrentAssembliesReferenceResolver())10 .GetReferences(null, null)11 .Select(r => r.GetFile())12 .ToArray();13 foreach (var l in loadedAssemblies)14 {15 compilerReference.Add(CompilerReference.From(l));16 }17 18 19 20 }21 22 public string FindLoaded(IEnumerable refs, string find)23 {24 return refs.First(r => r.EndsWith(System.IO.Path.DirectorySeparatorChar + find));25 }26 public IEnumerable GetReferences(TypeContext context, IEnumerable includeAssemblies)27 {28 29 #region 加载依赖程序集 此处是加载所有程序集,效率需要改进30 31 return compilerReference;32 #endregion33 }34 }View Code
CompileViewAndLayout()是编译视图文件的主要部分,其中有路径的转换、key的定义规则等。
获取视图文件对应编译后的缓存key: Engine.Razor.GetKey();
编译模板文件(即layout部分): Engine.Razor.AddTemplate();
编译视图文件: Engine.Razor.RunCompile()。
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