①首先更新VS2017为最新版，参考：

https://www.jb51.net/softjc/683226.html 

https://jingyan.baidu.com/article/7f41ececa91098193d095cf1.html

②接下来添加路由设置：

添加以下代码，到 Startup.cs 文件的 public void Configure(IApplicationBuilder app, IHostingEnvironment env) 函数里去：

           app.UseMvc(routes =>{routes.MapRoute(name: "area",template: "{area:exists}/{controller=Home}/{action=Index}/{id?}");routes.MapRoute(name: "default",template: "{controller=Home}/{action=Index}/{id?}");});

具体参考如下：

        public void Configure(IApplicationBuilder app, IHostingEnvironment env){app.UseMvc(routes =>{routes.MapRoute(name: "area",template: "{area:exists}/{controller=Home}/{action=Index}/{id?}");routes.MapRoute(name: "default",template: "{controller=Home}/{action=Index}/{id?}");});if (env.IsDevelopment()){app.UseDeveloperExceptionPage();}else{app.UseHsts();}app.UseHttpsRedirection();app.UseMvc();}

③在你的Controller上方添加：[Area("Demo")]

namespace JSYSTEM.API.Areas.Demo.Controllers
{[Area("Demo")]public class TestController : Controller{[HttpGet]public IActionResult Index(){return View();}}
}

运行后，url定位到：https://localhost:1234/demo/test 就可以了。其中demo是区域Area，test是控制器Controller

④.NET WebAPI调用，Controller上方添加路由[Route("[area]/[controller]/[action]")] 和 [Area("Demo")]

namespace SYSTEM.API.Areas.Demo.Controllers
{    [ApiController][Area("Demo")][Route("[area]/[controller]/[action]")]public class TestApiController : BaseApiController{//https://localhost:44377/Demo/TestApi/GetStringApi[HttpGet]public ApiBaseResult GetStringApi(){return ReturnApiBaseResult("hello word!");}}
}

调用API接口：https://localhost:44377/Demo/TestApi/GetStringApi 就可以了