为ASP.NETMVC1.0添加Areas

OStack程序员社区-中国程序员成长平台 › 门户 › 编程› ASP.NET›ASP.NET编程经验

原作者: [db:作者] 来自: [db:来源] 收藏邀请

今天闲逛时看到MVC 2.0的一些新特性，其中一样就是：提供域划分功能（Areas）。MVC 1.0刚发布的时候，我就为这个东西纠结过一段时间，后来在老外的Blog上看到了一个简单的解决方案，一直都在用，现整理出来，给有需要的同学做个参考。
园子里对这个功能关注的人好象不是很多，所以对此功能稍做一下解释。域划分简单的说就是按功能来划分模块。如用户模块(User)及文章模块(Article)，每个模块都有好几个Controller,也许我们需要把模块分别放在独立的命名空间下。在Url上，模块划分体现为：/{Area}/{Controller}/{Action}。（可能我说的不大清楚，尚不明白的请自行到网上搜索）
以下为步骤：
1.把Controller按模块分类。

2.为模块设计路由

3.更换模板引擎（见上图）

4.将视图移至Area文件夹（路径为/{Area}/{Controller}/{Action}）

以下为实现
1.为路由添加area

代码

using System.Web.Routing;

namespace Madnet.DevMvc
{
    public static class RouteHelper
    {
        public static void CreateArea(this RouteCollection routes, string areaName, string[] controllersNamespace, params Route[] routeEntries)
        {
            foreach (var route in routeEntries)
            {
                if (route.Constraints == null) route.Constraints = new RouteValueDictionary();
                if (route.Defaults == null) route.Defaults = new RouteValueDictionary();
                if (route.DataTokens == null) route.DataTokens = new RouteValueDictionary();

                route.Constraints.Add("area", areaName);
                route.Defaults.Add("area", areaName);
                route.DataTokens.Add("namespaces", controllersNamespace);

                if (!routes.Contains(route)) // To support "new Route()" in addition to "routes.MapRoute()"
                    routes.Add(route);
            }
        }
    }
}

2.改造模板引擎，以满足基于area的模板路径搜索

代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;

namespace Madnet.DevMvc
{
    public class DefaultViewEngine: WebFormViewEngine
    {
        public DefaultViewEngine()
            : base()
        {
            ViewLocationFormats = new[] {
                "~/{0}.aspx",
                "~/{0}.ascx",
                "~/Views/{1}/{0}.aspx",
                "~/Views/{1}/{0}.ascx",
                "~/Views/Shared/{0}.aspx",
                "~/Views/Shared/{0}.ascx",
            };

            MasterLocationFormats = new[] {
                "~/{0}.master",
                "~/Shared/{0}.master",
                "~/Views/{1}/{0}.master",
                "~/Views/Shared/{0}.master",
            };

            PartialViewLocationFormats = ViewLocationFormats;
        }
        #region IViewEngine Members
        public override ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName, bool useCache) {

            ViewEngineResult areaResult = null;

            if (controllerContext.RouteData.Values.ContainsKey("area")) {
                string areaPartialName = FormatViewName(controllerContext, partialViewName);
                areaResult = base.FindPartialView(controllerContext, areaPartialName, useCache);
                if (areaResult != null && areaResult.View != null) {
                    return areaResult;
                }
                string sharedAreaPartialName = FormatSharedViewName(controllerContext, partialViewName);
                areaResult = base.FindPartialView(controllerContext, sharedAreaPartialName, useCache);
                if (areaResult != null && areaResult.View != null) {
                    return areaResult;
                }
            }

            return base.FindPartialView(controllerContext, partialViewName, useCache);
        }

        public override ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache) {
            ViewEngineResult areaResult = null;

            if (controllerContext.RouteData.Values.ContainsKey("area")) {
                string areaViewName = FormatViewName(controllerContext, viewName);
                string masterAreaViewName = FormatMasterViewName(controllerContext, masterName);
                areaResult = base.FindView(controllerContext, areaViewName, masterAreaViewName, useCache);
                if (areaResult != null && areaResult.View != null)
                {
                    return areaResult;
                }

                areaResult = base.FindView(controllerContext, areaViewName, masterName, useCache);
                if (areaResult != null && areaResult.View != null) {
                    return areaResult;
                }

                string sharedAreaViewName = FormatSharedViewName(controllerContext, viewName);
                areaResult = base.FindView(controllerContext, sharedAreaViewName, masterAreaViewName, useCache);
                if (areaResult != null && areaResult.View != null)
                {
                    return areaResult;
                }
                areaResult = base.FindView(controllerContext, sharedAreaViewName, masterName, useCache);
                if (areaResult != null && areaResult.View != null) {
                    return areaResult;
                }
            }

            return base.FindView(controllerContext, viewName, masterName, useCache);
        }
        #endregion IViewEngine Members
        private static string FormatViewName(ControllerContext controllerContext, string viewName)
        {
            string controllerName = controllerContext.RouteData.GetRequiredString("controller");
            string area = controllerContext.RouteData.Values["area"].ToString();
            return "Views/" + (string.IsNullOrEmpty(area) ? "" : (area + "/")) + "/" + controllerName + "/" + viewName;
        }

        private static string FormatSharedViewName(ControllerContext controllerContext, string viewName)
        {
            string area = controllerContext.RouteData.Values["area"].ToString();
            return "Views/" + (string.IsNullOrEmpty(area) ? "" : (area + "/")) + "/Shared/" + viewName;
        }
        private static string FormatMasterViewName(ControllerContext controllerContext, string masterName)
        {
            string area = controllerContext.RouteData.Values["area"].ToString();
            return "Views/" + (string.IsNullOrEmpty(area) ? "" : (area + "/")) + "/Masters/" + masterName;
        }
    }
}

--------------------------------------
http://www.qwolf.com/