52ABP

AddMvc 源码

GitHub：Microsoft.AspNetCore.Mvc/MvcServiceCollectionExtensions.cs

/// <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));
    }
    var builder = services.AddMvcCore();
    builder.AddApiExplorer();
    builder.AddAuthorization();
    AddDefaultFrameworkParts(builder.PartManager);
    // Order added affects options setup order
    // Default framework order
    builder.AddFormatterMappings();
    builder.AddViews();
    builder.AddRazorViewEngine();
    builder.AddRazorPages();
    builder.AddCacheTagHelper();
    // +1 order
    builder.AddDataAnnotations(); // +1 order
    // +10 order
    builder.AddJsonFormatters();
    builder.AddCors();
    return new MvcBuilder(builder.Services, builder.PartManager);
}

注：参考源码，如下配置就能在 AddMvcCore 时支持 JsonFormatters 了。

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvcCore().AddJsonFormatters();
}