问题重现：
当项目下：Controller/HomeController.cs时，
人在创建一个域Test,之后在建一个同名的HomeController: Areas/Test/Controller/HomeController.cs
运行报错：
Multiple types were found that match the controller named 'Home'. This can happen if the route that services this request ('{controller}/{action}/{id}/') does not specify namespaces to search for a controller that matches the request. If this is the case, register this route by calling an overload of the 'MapRoute' method that takes a 'namespaces' parameter.
The request for 'Home' has found the following matching controllers:
Web.Areas.Test.Controllers.HomeController
Web.Controllers.HomeController
解决办法：
/Areas/Test/TestAreaRegistration.cs
代码
context.MapRoute(
"Test_default",
"Test/{controller}/{action}/{id}/",
new { controller = "Home", action = "Index", id = UrlParameter.Optional },
new string[] { "Web.Areas.Test.Controllers"}
);
/Global.asax
routes.MapRoute(
"Home", // Route name
"{controller}/{action}/{id}/", // URL with parameters
new { controller = "Home", action = "Index", id = UrlParameter.Optional },
new string[] { "Web.Controllers"}
);
"Home", // Route name
"{controller}/{action}/{id}/", // URL with parameters
new { controller = "Home", action = "Index", id = UrlParameter.Optional },
new string[] { "Web.Controllers"}
);