/// <summary>
/// 定义个类RouteConvention，private 来实现 IApplicationModelConvention 接口
/// </summary>

　　　　public class RouteConvention : IApplicationModelConvention

     {

         private readonly AttributeRouteModel _centralPrefix;

         public RouteConvention(IRouteTemplateProvider routeTemplateProvider)

         {

             _centralPrefix = new AttributeRouteModel(routeTemplateProvider);

         }

         //接口的Apply方法

         public void Apply(ApplicationModel application)

         {

             application.Controllers.Where(d => !d.ControllerName.Contains("Base") &&

             d.Attributes.Any(a => a.ToString().Contains(

             "ApiControllerAttribute")))

               .Each(controller =>

               {

                   controller.Selectors

                     .Each(selectorModel =>

                     {
　　　　　　　　　　　　　　　　//修改路由

                         selectorModel.AttributeRouteModel = _centralPrefix;

                     });

               });

         }

     }

servers.AddMvc(opts=>{

  string apirouter = configuration["apirouter"];

                if (apirouter.IsNullOrEmpty())

                {

                    apirouter = "api/v{version}/[controller]";

                }

// 添加我们自定义 实现IApplicationModelConvention的RouteConvention

            opts.Conventions.Insert(, new RouteConvention(new RouteAttribute(apirouter)));

}