实例介绍
【实例简介】
【实例截图】
【核心代码】
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; namespace ViewEnginePlus { public class RazorViewEnginePlus : ViewEnginePlus, IViewEngine { private readonly RazorViewEngine fallbackViewEngine = new RazorViewEngine(); private string lastTheme; private RazorViewEngine lastEngine; private readonly object @lock = new object(); // Temp private string activeTheme; // Implementations for IViewEngine public ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName, bool useCache) { TestViewCases(); return ThemeViewEngine().FindPartialView(controllerContext, partialViewName, useCache); } public ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache) { // Refresh all of the test cases TestViewCases(); ViewEngineResult resultView = ThemeViewEngine().FindView(controllerContext, ModifyViewName(viewName), masterName, useCache); // If there is no modified view then try the original name if (resultView.View == null) { resultView = ThemeViewEngine().FindView(controllerContext, viewName, masterName, useCache); } return resultView; } public void ReleaseView(ControllerContext controllerContext, IView view) { ThemeViewEngine().ReleaseView(controllerContext, view); } private RazorViewEngine ThemeViewEngine() { lock (@lock) { try { // [todo] Determine where active theme is coming from activeTheme = "Custom1"; // Allow the Theme to be overridden via the querystring ?theme=<newtheme> // Will probably need securing with Request.IsAuthenticated || IsLocal? var previewTheme = HttpContext.Current.Request.QueryString["theme"]; if (!string.IsNullOrEmpty(previewTheme)) { activeTheme = previewTheme; } // Check if requested theme is the same as the last one and just return that if (activeTheme == lastTheme) { return lastEngine; } } catch (Exception) { return fallbackViewEngine; } // If we have got this far then we are creating a new theme engine // Create a new base egnine lastEngine = new RazorViewEngine(); // New View locations // This leave all the default locations so /Views/{1}/{0}.cshtml will be used as a fall back aswell lastEngine.ViewLocationFormats = new[] { "~/Views/{1}/{0}_" viewCase ".cshtml", "~/Themes/" activeTheme "/Views/{1}/{0}.cshtml", "~/Themes/" activeTheme "/Views/{0}.cshtml", "~/Themes/" activeTheme "/Views/Shared/{0}.cshtml", "~/Themes/" activeTheme "/Views/Shared/{1}/{0}.cshtml" }.Union(lastEngine.ViewLocationFormats).ToArray(); // New PartialView locations lastEngine.PartialViewLocationFormats = new[] { "~/Themes/" activeTheme "/Views/{1}/{0}.cshtml", "~/Themes/" activeTheme "/Views/Shared/{0}.cshtml", "~/Themes/" activeTheme "/Views/Shared/{1}/{0}.cshtml", "~/Themes/" activeTheme "/Views/{0}.cshtml" }.Union(lastEngine.PartialViewLocationFormats).ToArray(); // New Master locations lastEngine.MasterLocationFormats = new[] { "~/Themes/" activeTheme "/Views/{1}/{0}.cshtml", "~/Themes/" activeTheme "/Views/Shared/{1}/{0}.cshtml", "~/Themes/" activeTheme "/Views/Shared/{0}.cshtml", "~/Themes/" activeTheme "/Views/{0}.cshtml" }.Union(lastEngine.MasterLocationFormats).ToArray(); // Set the last used theme to the current active theme lastTheme = activeTheme; return lastEngine; } } } }
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