Configure used with WebApplicationBuilder.WebHost (ASP0009)

Key dotnet.api.configure-on-builder-webhost · Severity error · Category api

ASP.NET Core analyzer ASP0009. Flags Configure called on WebApplicationBuilder.WebHost, which throws at startup; the pipeline is configured on the built WebApplication.

Incorrect

builder.WebHost.Configure(app => app.UseRouting());

Correct

var app = builder.Build();
app.UseRouting();