這篇文章主要為大家展示了“ASP.NET MVC重寫的示例分析”,內(nèi)容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領(lǐng)大家一起研究并學習一下“ASP.NET MVC重寫的示例分析”這篇文章吧。
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我將通過重寫視圖引擎的方式來進行演示,在這之前,我假設(shè)你已經(jīng)具備了MVC的一些基礎(chǔ),我們先來看下效果:
系統(tǒng)登錄后是默認主題,當我們點擊切換主題之后,左側(cè)菜單欄的布局變了,右側(cè)內(nèi)容的樣式也變了,而地址欄是不變的。界面UI用的metronic,雖然官網(wǎng)是收費的,但是在天朝,總是可以找到免費的。官方地址:http://keenthemes.com/preview/metronic/
在這里,我使用了分區(qū)域、分模塊(按獨立的業(yè)務(wù)功能劃分)的方式,一個模塊就是一個獨立的dll,在這里Secom.Emx.Admin和Secom.Emx.History就是兩個獨立的模塊,并分別創(chuàng)建了區(qū)域Admin和History。
你會發(fā)現(xiàn)Secom.Emx.Admin模型下面的Areas目錄和Secom.Emx.WebApp中的目錄是一模一樣的,其實我最初不想在模塊項目中添加任何的View,但是為了方便獨立部署還是加了。
右鍵單擊項目Secom.Emx.Admin,選擇“屬性”——“生成事件”添加如下代碼:
xcopy /e/r/y $(ProjectDir)Areas\Admin\Views $(SolutionDir)Secom.Emx.WebApp\Areas\Admin\Views
這命令很簡單,其實就是當編譯項目Secom.Emx.Admin的時候,將項目中的Views復(fù)制到Secom.Emx.WebApp項目的指定目錄下。
區(qū)域配置文件我放置到了Secom.Emx.WebApp中,其實你完全可以獨立放置到一個類庫項目中,因為注冊區(qū)域路由的后,項目最終會尋找bin目錄下面所有繼承了AreaRegistration類的,然后讓WebApp引用這個類庫項目,Secom.Emx.WebApp項目添加Secom.Emx.Admin、Secom.Emx.History的引用。
AdminAreaRegistration代碼如下:
using System.Web.Mvc; namespace Secom.Emx.WebApp { public class AdminAreaRegistration : AreaRegistration { public override string AreaName { get { return "Admin"; } } public override void RegisterArea(AreaRegistrationContext context) { context.MapRoute( "Admin_default", "Admin/{controller}/{action}/{id}", new { action = "Index", id = UrlParameter.Optional }, namespaces:new string[1] { "Secom.Emx.Admin.Areas.Admin.Controllers" } ); } } }
注意命名空間和后面添加的 namespaces:new string[1] { "Secom.Emx.Admin.Areas.Admin.Controllers" },這個命名空間就是獨立模塊Secom.Emx.Admin下面的控制器所在的命名空間。
HistoryAreaRegistration代碼如下:
using System.Web.Mvc; namespace Secom.Emx.WebApp { public class HistoryAreaRegistration : AreaRegistration { public override string AreaName { get { return "History"; } } public override void RegisterArea(AreaRegistrationContext context) { context.MapRoute( "History_default", "History/{controller}/{action}/{id}", new { action = "Index", id = UrlParameter.Optional }, namespaces:new string[1] { "Secom.Emx.History.Areas.History.Controllers" } ); } } }
我們先看下RazorViewEngine的原始構(gòu)造函數(shù)如下:
public RazorViewEngine(IViewPageActivator viewPageActivator) : base(viewPageActivator) { AreaViewLocationFormats = new[] { "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/{1}/{0}.vbhtml", "~/Areas/{2}/Views/Shared/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.vbhtml" }; AreaMasterLocationFormats = new[] { "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/{1}/{0}.vbhtml", "~/Areas/{2}/Views/Shared/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.vbhtml" }; AreaPartialViewLocationFormats = new[] { "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/{1}/{0}.vbhtml", "~/Areas/{2}/Views/Shared/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.vbhtml" }; ViewLocationFormats = new[] { "~/Views/{1}/{0}.cshtml", "~/Views/{1}/{0}.vbhtml", "~/Views/Shared/{0}.cshtml", "~/Views/Shared/{0}.vbhtml" }; MasterLocationFormats = new[] { "~/Views/{1}/{0}.cshtml", "~/Views/{1}/{0}.vbhtml", "~/Views/Shared/{0}.cshtml", "~/Views/Shared/{0}.vbhtml" }; PartialViewLocationFormats = new[] { "~/Views/{1}/{0}.cshtml", "~/Views/{1}/{0}.vbhtml", "~/Views/Shared/{0}.cshtml", "~/Views/Shared/{0}.vbhtml" }; FileExtensions = new[] { "cshtml", "vbhtml", }; }
然后新建CustomRazorViewEngine繼承自RazorViewEngine,對View的路由規(guī)則進行了重寫,既然可以重寫路由規(guī)則,那意味著,你可以任意定義規(guī)則,然后遵守自己定義的規(guī)則就可以了。需要注意的是,要注意路由數(shù)組中的順序,查找視圖時,是按照前后順序依次查找的,當找到了視圖就立即返回,不會再去匹配后面的路由規(guī)則。為了提升路由查找效率,我這里刪除了所有vbhtml的路由規(guī)則,因為我整個項目中都采用C#語言。
using System.Web.Mvc; namespace Secom.Emx.WebApp.Helper { public class CustomRazorViewEngine : RazorViewEngine { public CustomRazorViewEngine(string theme) { if (!string.IsNullOrEmpty(theme)) { AreaViewLocationFormats = new[] { //themes "~/themes/"+theme+"/views/Areas/{2}/{1}/{0}.cshtml", "~/themes/"+theme+"/Shared/{0}.cshtml" "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.cshtml" }; AreaMasterLocationFormats = new[] { //themes "~/themes/"+theme+"/views/Areas/{2}/{1}/{0}.cshtml", "~/themes/"+theme+"/views/Areas/{2}/Shared/{0}.cshtml", "~/themes/"+theme+"/views/Shared/{0}.cshtml", "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.cshtml" }; AreaPartialViewLocationFormats = new[] { //themes "~/themes/"+theme+"/views/Shared/{0}.cshtml", "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.cshtml" }; ViewLocationFormats = new[] { //themes "~/themes/"+theme+"/views/{1}/{0}.cshtml", "~/Views/{1}/{0}.cshtml", "~/Views/Shared/{0}.cshtml" }; MasterLocationFormats = new[] { //themes "~/themes/"+theme+"/views/Shared/{0}.cshtml", "~/Views/{1}/{0}.cshtml", "~/Views/Shared/{0}.cshtml" }; PartialViewLocationFormats = new[] { //themes "~/themes/"+theme+"/views/Shared/{0}.cshtml", "~/Views/{1}/{0}.cshtml", "~/Views/Shared/{0}.cshtml" }; FileExtensions = new[]{"cshtml"}; } } } }
重寫后,我們的路由規(guī)則將是這樣的:當沒有選擇主題的情況下,沿用原來的路由規(guī)則,如果選擇了主題,則使用重寫后的路由規(guī)則。
新的路由規(guī)則:在選擇了主題的情況下,優(yōu)先查找thems/主題名稱/views/Areas/區(qū)域名稱/控制器名稱/視圖名稱.cshtml,如果找不到再按照默認的路由規(guī)則去尋找,也就是Areas/區(qū)域名稱/Views/控制器名稱/視圖名稱.cshtml
切換主題View代碼:
當用戶登錄成功的時候,從Cookie中讀取所選主題信息,當Cookie中沒有讀取到主題記錄時,則從Web.config配置文件中讀取配置的主題名稱,如果都沒有讀取到,則說明是默認主題,沿用原有的視圖引擎規(guī)則。
在后臺管理界面,每次選擇了主題,我都將主題名稱存儲到Cookie中,默認保存一年,這樣當下次再登錄的時候,就能夠記住所選的主題信息了。
using System; using System.Web.Mvc; using Secom.Emx.WebApp.Helper; using System.Web; using Secom.Emx.Common.Controllers; namespace Secom.Emx.WebApp.Controllers { public class HomeController : BaseController { string themeCookieName = "Theme"; public ActionResult Index() { ViewData["Menu"] = GetMenus(); return View(); } public ActionResult SetTheme(string themeName,string href) { if (!string.IsNullOrEmpty(themeName)) { Response.Cookies.Set(new HttpCookie(themeCookieName, themeName) { Expires = DateTime.Now.AddYears(1) }); } else { themeName = Request.Cookies[themeCookieName].Value ?? "".Trim(); } Utils.ResetRazorViewEngine(themeName); return string.IsNullOrEmpty(href)? Redirect("~/Home/Index"):Redirect(href); } public ActionResult Login() { string themeName = Request.Cookies[themeCookieName].Value ?? "".Trim(); if (!string.IsNullOrEmpty(themeName)) { Utils.ResetRazorViewEngine(themeName); } return View(); } } }
Utils類:
using System.Configuration; using System.Web.Mvc; namespace Secom.Emx.WebApp.Helper { public class Utils { private static string _themeName; public static string ThemeName { get { if (!string.IsNullOrEmpty(_themeName)) { return _themeName; } //模板風格 _themeName =string.IsNullOrEmpty(ConfigurationManager.AppSettings["Theme"])? "" : ConfigurationManager.AppSettings["Theme"]; return _themeName; } } public static void ResetRazorViewEngine(string themeName) { themeName = string.IsNullOrEmpty(themeName) ? Utils.ThemeName : themeName; if (!string.IsNullOrEmpty(themeName)) { ViewEngines.Engines.Clear(); ViewEngines.Engines.Add(new CustomRazorViewEngine(themeName)); } } } }
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