.NET5 AddMvc和AddControllersWithViews区别

AddMvc源码

    	/// <summary>
        /// Adds MVC services to the specified <see cref="IServiceCollection">.
        /// </see></summary>
        /// <param name="services">The <see cref="IServiceCollection"> to add services to.
        /// <returns>An <see cref="IMvcBuilder"> that can be used to further configure the MVC services.</see></returns>
        public static IMvcBuilder AddMvc(this IServiceCollection services)
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }

            services.AddControllersWithViews();
            return services.AddRazorPages();
        }

	/// <summary>
        /// Adds MVC services to the specified <see cref="IServiceCollection">.
        /// </see></summary>
        /// <param name="services">The <see cref="IServiceCollection"> to add services to.
        /// <param name="setupAction">An <see cref="Action{MvcOptions}"> to configure the provided <see cref="MvcOptions">.
        /// <returns>An <see cref="IMvcBuilder"> that can be used to further configure the MVC services.</see></returns>
        public static IMvcBuilder AddMvc(this IServiceCollection services, Action<mvcoptions> setupAction)
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }

            if (setupAction == null)
            {
                throw new ArgumentNullException(nameof(setupAction));
            }

            var builder = services.AddMvc();
            builder.Services.Configure(setupAction);

            return builder;
        }

AddControllersWithViews源码

       public static IMvcBuilder AddControllersWithViews(this IServiceCollection services)
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }

            var builder = AddControllersWithViewsCore(services);
            return new MvcBuilder(builder.Services, builder.PartManager);
        }
        public static IMvcBuilder AddControllersWithViews(this IServiceCollection services, Action<mvcoptions>? configure)
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }

            // This method excludes all of the view-related services by default.
            var builder = AddControllersWithViewsCore(services);
            if (configure != null)
            {
                builder.AddMvcOptions(configure);
            }

            return new MvcBuilder(builder.Services, builder.PartManager);
        }