fluentvalidation-startup.cs

    public override void Configure(IFunctionsHostBuilder builder)
    {
      ...
      builder.Services.AddLogging();
      
      //workaround azure functions not handling nested arrays by default
      builder.Services.AddTransient<IConfigureOptions<MvcOptions>, MvcJsonMvcOptionsSetup>();

      builder.Services.AddTransient<BaseValidator<Widget>, WidgetValidator>(o => new WidgetValidator());
      builder.Services.AddTransient<BaseValidator<User>, UserValidator>(o => new UserValidator());

      builder.Services.AddTransient<FunctionWrapper<Widget>>();
      builder.Services.AddTransient<FunctionWrapper<User>>();
      ...
    }