//app.UseMvcWithDefaultRoute();app.UseMvc(routes=> {// add the new route here.routes.MapRoute(name: "areaRoute",template: "{area:exists}/{controller}/{action}",defaults: new { controller = "Home", action = "Index" });routes.MapRoute(name: "default",template: "{controller}/{action}/{id?}",defaults: new { controller = "Home", action = "Index" });});
2. 创建Areas相关文件夹:

3. 在Area的Views目录下的_ViewStart.cshtml文件中, 指定Area的默认模板

4. 创建Area的Controller类:
[Area("Admin")]public class HomeController: Controller{public IActionResult Login(){return View();}}
5. 创建_Layout.cshtml及View文件.