Endpoint Routing does not support 'IApplicationBuilder.UseMvc(...)

[HanumantappaBudihal]

Endpoint Routing does not support 'IApplicationBuilder.UseMvc(...)

When try to start the API app (.NET Core 3.1 framewrok) , getting the below error

System.InvalidOperationException
HResult=0x80131509
Message=Endpoint Routing does not support 'IApplicationBuilder.UseMvc(...)'. To use 'IApplicationBuilder.UseMvc' set 'MvcOptions.EnableEndpointRouting = false' inside 'ConfigureServices(...).
Source=Microsoft.AspNetCore.Mvc.Core
StackTrace:
at Microsoft.AspNetCore.Builder.MvcApplicationBuilderExtensions.UseMvc(IApplicationBuilder app, Action`1 configureRoutes)
at Microsoft.AspNetCore.Builder.MvcApplicationBuilderExtensions.UseMvc(IApplicationBuilder app)
at Hexagonal.RESTApiWithJWTSample.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env) in D:\8.GitHub\HanumantappaBudihal\ASP.NET-Core-JWT-Authentication\src\Hexagonal.JWTAuthentication\Hexagonal.RESTApiWithJWTSample\Startup.cs:line 42
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)
at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.b__0(IApplicationBuilder builder)
at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)

To Reproduce

Trying to build REST api using .NET Core 3.1 and EF Core

Exceptions (if any)

	Name	Value	Type

▶ | TargetSite | {Microsoft.AspNetCore.Builder.IApplicationBuilder UseMvc(Microsoft.AspNetCore.Builder.IApplicationBuilder, System.Action`1[Microsoft.AspNetCore.Routing.IRouteBuilder])} | System.Reflection.MethodBase {System.Reflection.RuntimeMethodInfo}

▶ | Data | {System.Collections.ListDictionaryInternal} | System.Collections.IDictionary {System.Collections.ListDictionaryInternal}

Further technical details

• ASP.NET Core version : 3.1
• .NET Core SDK (reflecting any global.json):
  Version: 3.1.300
  Commit: b2475c1295

Runtime Environment:
OS Name: Windows
OS Version: 10.0.18363
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.300\

Host (useful for support):
Version: 3.1.4
Commit: 0c2e69caa6

.NET Core SDKs installed:
2.1.514 [C:\Program Files\dotnet\sdk]
3.1.300 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

• The IDE : VS 2019 Version 16.6.1

[davidfowl]

Yes this is by design, please see the migration guide https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.1&tabs=visual-studio#mvc-service-registration