会出现如下错误”找到多个与名为“home”的控制器匹配的类型“
在RouteConfig文件中添加命名空间可解决
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
namespaces: new string[] { "Letter.Web.Controllers" }
);