services.AddControllersWithViews()与services.AddMvc()

Question

为了能够在我的ASP.NET核心应用程序中添加控制器，我可以添加

services.AddControllersWithViews()

或

services.AddMvc()

在ConfigureServices方法中的Startup类。

看来他们俩对我都很好。我想知道在哪种情况下哪个更好？

据我所知，services.AddMvc()是较老的方式，但仍然可用。

如果我继续使用services.AddMvc()，将来会不会有问题？

Answer 1

源代码本身就说明了问题。

https://source.dot.net/#Microsoft.AspNetCore.Mvc/MvcServiceCollectionExtensions.cs,27

/// <summary>
/// Adds MVC services to the specified <see cref="IServiceCollection" />.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
/// <returns>An <see cref="IMvcBuilder"/> that can be used to further configure the MVC services.</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" />.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
/// <param name="setupAction">An <see cref="Action{MvcOptions}"/> to configure the provided <see cref="MvcOptions"/>.</param>
/// <returns>An <see cref="IMvcBuilder"/> that can be used to further configure the MVC services.</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;
}

MvcServiceCollectionExtensions.AddControllersWithViews()

/// <summary>
/// Adds services for controllers to the specified <see cref="IServiceCollection"/>. This method will not
/// register services used for pages.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
/// <returns>An <see cref="IMvcBuilder"/> that can be used to further configure the MVC services.</returns>
/// <remarks>
/// <para>
/// This method configures the MVC services for the commonly used features with controllers with views. This
/// combines the effects of <see cref="MvcCoreServiceCollectionExtensions.AddMvcCore(IServiceCollection)"/>,
/// <see cref="MvcApiExplorerMvcCoreBuilderExtensions.AddApiExplorer(IMvcCoreBuilder)"/>,
/// <see cref="MvcCoreMvcCoreBuilderExtensions.AddAuthorization(IMvcCoreBuilder)"/>,
/// <see cref="MvcCorsMvcCoreBuilderExtensions.AddCors(IMvcCoreBuilder)"/>,
/// <see cref="MvcDataAnnotationsMvcCoreBuilderExtensions.AddDataAnnotations(IMvcCoreBuilder)"/>,
/// <see cref="MvcCoreMvcCoreBuilderExtensions.AddFormatterMappings(IMvcCoreBuilder)"/>,
/// <see cref="TagHelperServicesExtensions.AddCacheTagHelper(IMvcCoreBuilder)"/>,
/// <see cref="MvcViewFeaturesMvcCoreBuilderExtensions.AddViews(IMvcCoreBuilder)"/>,
/// and <see cref="MvcRazorMvcCoreBuilderExtensions.AddRazorViewEngine(IMvcCoreBuilder)"/>.
/// </para>
/// <para>
/// To add services for pages call <see cref="AddRazorPages(IServiceCollection)"/>.
/// </para>
/// </remarks>
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);
}

/// <summary>
/// Adds services for controllers to the specified <see cref="IServiceCollection"/>. This method will not
/// register services used for pages.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
/// <param name="configure">An <see cref="Action{MvcOptions}"/> to configure the provided <see cref="MvcOptions"/>.</param>
/// <returns>An <see cref="IMvcBuilder"/> that can be used to further configure the MVC services.</returns>
/// <remarks>
/// <para>
/// This method configures the MVC services for the commonly used features with controllers with views. This
/// combines the effects of <see cref="MvcCoreServiceCollectionExtensions.AddMvcCore(IServiceCollection)"/>,
/// <see cref="MvcApiExplorerMvcCoreBuilderExtensions.AddApiExplorer(IMvcCoreBuilder)"/>,
/// <see cref="MvcCoreMvcCoreBuilderExtensions.AddAuthorization(IMvcCoreBuilder)"/>,
/// <see cref="MvcCorsMvcCoreBuilderExtensions.AddCors(IMvcCoreBuilder)"/>,
/// <see cref="MvcDataAnnotationsMvcCoreBuilderExtensions.AddDataAnnotations(IMvcCoreBuilder)"/>,
/// <see cref="MvcCoreMvcCoreBuilderExtensions.AddFormatterMappings(IMvcCoreBuilder)"/>,
/// <see cref="TagHelperServicesExtensions.AddCacheTagHelper(IMvcCoreBuilder)"/>,
/// <see cref="MvcViewFeaturesMvcCoreBuilderExtensions.AddViews(IMvcCoreBuilder)"/>,
/// and <see cref="MvcRazorMvcCoreBuilderExtensions.AddRazorViewEngine(IMvcCoreBuilder)"/>.
/// </para>
/// <para>
/// To add services for pages call <see cref="AddRazorPages(IServiceCollection)"/>.
/// </para>
/// </remarks>
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);
}

如您所见，AddMvc基本上是在包装对AddControllersWithViews的调用，并添加了调用AddRazorPages。

如果我继续使用services.AddMvc()，将来会不会有问题？

没有办法准确地回答这个问题。

遵循现有文档提供的建议，以避免任何不必要的行为。