How to add global route prefix in asp.net core 3?

Question

Legacy .net core frameworks used UseMvc() for adding global route prefix. How to make it for asp.net core 3 without UseMvc() ?

Answer 1

You could refer to below demo in asp.net core 3.0 to set global route prefix with api version.You could set any prefix as you like by changing services.AddControllersWithViews(o => { o.UseGeneralRoutePrefix("api/v{version:apiVersion}"); });

1.Create a custom MvcOptionsExtensions

public static class MvcOptionsExtensions {     public static void UseGeneralRoutePrefix(this MvcOptions opts, IRouteTemplateProvider routeAttribute)     {         opts.Conventions.Add(new RoutePrefixConvention(routeAttribute));     }      public static void UseGeneralRoutePrefix(this MvcOptions opts, string      prefix)     {         opts.UseGeneralRoutePrefix(new RouteAttribute(prefix));     } }  public class RoutePrefixConvention : IApplicationModelConvention {     private readonly AttributeRouteModel _routePrefix;      public RoutePrefixConvention(IRouteTemplateProvider route)     {         _routePrefix = new AttributeRouteModel(route);     }      public void Apply(ApplicationModel application)     {         foreach (var selector in application.Controllers.SelectMany(c => c.Selectors))         {             if (selector.AttributeRouteModel != null)             {                 selector.AttributeRouteModel = AttributeRouteModel.CombineAttributeRouteModel(_routePrefix, selector.AttributeRouteModel);             }             else             {                 selector.AttributeRouteModel = _routePrefix;             }         }     } } 

2.Register in Startup.cs( you need to install package Microsoft.AspNetCore.Mvc.Versioning ,current version for 3.0 is 4.0.0-preview8.19405.7)

public void ConfigureServices(IServiceCollection services) {     //MVC service registration     //https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.0&tabs=visual-studio#mvc-service-registration     services.AddControllersWithViews(o = >{         o.UseGeneralRoutePrefix("api/v{version:apiVersion}");     });      services.AddApiVersioning(o = >o.ReportApiVersions = true); }  // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app, IHostingEnvironment env) {      if (env.IsDevelopment()) {         app.UseDeveloperExceptionPage();     }      app.UseRouting();      app.UseAuthentication();     app.UseAuthorization();      app.UseEndpoints(endpoints = >{         endpoints.MapControllerRoute(         name: "default", pattern: "{controller=Home}/{action=Index}/{id?}");         endpoints.MapRazorPages();     }); } 

3.Controller:

[ApiVersion("1")] [ApiVersion("2")] [Route("test")] [ApiController] public class TestController : ControllerBase {     [HttpGet("version"), MapToApiVersion("1")]     public IActionResult GetV1()     {         return new OkObjectResult("Version One");     } } 

4.Result

Calling /api/v1/test/version results in "Version One".