private static IApplicationBuilder ValidateStartupClasses()

in src/Google.Cloud.Functions.Hosting/HostingInternals.cs [102:113]

• 11 lines of code
• 2 McCabe index (conditional complexity)

        private static IApplicationBuilder ValidateStartupClasses(IApplicationBuilder app)
        {
            var functionType = app.ApplicationServices.GetRequiredService<FunctionTypeProvider>().FunctionType;
            var actualStartupClasses = app.ApplicationServices.GetServices<FunctionsStartup>().Select(startup => startup.GetType()).ToList();
            var startupClassesFromFunctionTarget = FunctionsStartupAttribute.GetStartupTypes(functionType.Assembly, functionType);

            if (!actualStartupClasses.SequenceEqual(startupClassesFromFunctionTarget))
            {
                throw new InvalidOperationException("Mismatch in startup classes. See https://github.com/GoogleCloudPlatform/functions-framework-dotnet/blob/main/docs/customization.md#specifying-a-functions-startup-class");
            }
            return app;
        }