IHttpContextAccessor 获取路由信息

Startup.cs > ConfigureServices > 中添加

 //获取路由信息
 services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

接着在Controller 中 

private IHttpContextAccessor _accessor;

 public ……Controller(IHttpContextAccessor accessor)
        {
            _accessor = accessor;
        }