Asp.net MVC 自定义ViewEngine的简单实现

来源：互联网发布：final cut for mac 编辑：程序博客网时间：2024/05/29 03:35

Asp.net MVC 网站换肤需要使用不同模板，可以通过自定义视图引擎来实现这个功能。这里我偷懒，直接继承 VirtualPathProviderViewEngine来实现。

核心代码如下：

ThemeViewEngine.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
 
namespace MvcSkinDemo.Code
{
    public class ThemeViewEngine : VirtualPathProviderViewEngine
    {
        private string _theme;
        /// <summary>
        /// 使用的主题名称
        /// </summary>
        public string Theme
        {
            get {return _theme; }
            set
            {
                _theme = string.IsNullOrEmpty(value) ? "Default" : value;
                SetLocationFormats(_theme);
            }
        }
 
        public ThemeViewEngine(string themeName)
        {
            Theme = themeName;
        }
 
        /// <summary>
        /// 设置视图的搜索路径集合
        /// </summary>
        /// <param name="themeName">主题名</param>
        private void SetLocationFormats(string themeName)
        {
            base.MasterLocationFormats = new[] {
                "~/Views/Themes/" + themeName + "/{1}/{0}.master",
                "~/Views/Themes/" + themeName + "/Shared/{0}.master",
                "~/Views/Themes/Shared/{0}.master"
            };
 
            base.ViewLocationFormats = new[] {
                "~/Views/Themes/" + themeName + "/{1}/{0}.aspx",
                "~/Views/Themes/" + themeName + "/{1}/{0}.ascx",
                "~/Views/Themes/" + themeName + "/Shared/{0}.aspx",
                "~/Views/Themes/" + themeName + "/Shared/{0}.ascx",
                "~/Views/Themes/Shared/{1}/{0}.aspx",
                "~/Views/Themes/Shared/{1}/{0}.ascx",
                "~/Views/Themes/Shared/{0}.aspx",
                "~/Views/Themes/Shared/{0}.ascx"
            };
 
            base.PartialViewLocationFormats = base.ViewLocationFormats;
        }
 
        protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)
        {
            return new WebFormView(partialPath);
        }
 
        protected override IView CreateView(ControllerContext controllerContext, string viewPath,string masterPath)
        {
            return new WebFormView(viewPath, masterPath);
        }
    }
}

Global.asax 设置如下：

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protected void Application_Start()
     {
         AreaRegistration.RegisterAllAreas();
 
         ///初始化ViewEngine
         InitViewEngine();
 
         RegisterRoutes(RouteTable.Routes);
     }
 
     private void InitViewEngine()
     {
          
         ViewEngines.Engines.Clear();
         //在RC中目前还没找到好的在Controller中修改ViewEngine的办法
         //只好在这里将顺序换一下，对性能有一点影响
         //ViewEngines.Engines.Add(new ThemeViewEngine(theme));
         
         ViewEngines.Engines.Add(new ThemeViewEngine("default"));
     }

切换视图引擎：

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(ViewEngines.Engines[0]as ThemeViewEngine).Theme = "green";

项目结构如下：

如果你想定义强大的视图引擎，可以参考这个：

http://www.cnblogs.com/webabcd/archive/2009/05/14/1456453.html

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