ASP.NET MVC系列：Area

1. Area簡介

　　ASP.NET MVC Area機制構建專案，可以將相對獨立的功能模組切割劃分，降低專案的耦合度。

2. Area設定Routing

　　新建Admin Area後，自動建立AdminAreaRegistration.cs，用於設定Area Routing。

using System.Web.Mvc;

namespace Libing.Portal.Web.Areas.Admin
{
    public class AdminAreaRegistration : AreaRegistration
    {
        public override string AreaName
        {
            get
            {
                return "Admin";
            }
        }

        public override void RegisterArea(AreaRegistrationContext context)
        {
            context.MapRoute(
                name: "Admin_default",
                url: "Admin/{controller}/{action}/{id}",
                defaults: new { action = "Index", id = UrlParameter.Optional }
            );
        }
    }
}

　　在Global.asax.cs的Application_Start()，註冊Area路由。

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

namespace Libing.Portal.Web
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas(); // 註冊Area Routing
            RouteConfig.RegisterRoutes(RouteTable.Routes);
        }
    }
}

3. 解決預設站點與Area相同Controller名稱的Routing設定

　　當預設站點與Area中有相同名稱的Controller時，在Routing中新增namespace。

　　Areas/Admin/AdminAreaRegistration.cs

using System.Web.Mvc;

namespace Libing.Portal.Web.Areas.Admin
{
    public class AdminAreaRegistration : AreaRegistration
    {
        public override string AreaName
        {
            get
            {
                return "Admin";
            }
        }

        public override void RegisterArea(AreaRegistrationContext context)
        {
            context.MapRoute(
                name: "Admin_default",
                url: "Admin/{controller}/{action}/{id}",
                defaults: new { action = "Index", id = UrlParameter.Optional },
                namespaces: new string[] { "Libing.Portal.Web.Areas.Admin.Controllers" }
            );
        }
    }
}

　　App_Start/RouteConfig.cs

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

using Libing.Portal.Web.Models.Constraints;

namespace Libing.Portal.Web
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
                namespaces: new string[] { "Libing.Portal.Web.Controllers" }
            );
        }
    }
}

4. 在預設網站與Area網站的連結

@Html.ActionLink("AdminIndex", "Index", new { controller = "Home", area = "Admin" })