AspNetCore源码之MvcServiceCollectionExtensions.cs

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// Copyright (c) .NET Foundation. All rights reserved. // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.   using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Reflection; using Microsoft.AspNetCore.Mvc; using Microsoft.AspNetCore.Mvc.ApplicationParts; using Microsoft.AspNetCore.Mvc.Razor.TagHelpers; using Microsoft.AspNetCore.Mvc.TagHelpers;   namespace Microsoft.Extensions.DependencyInjection {     /// <summary>     /// Extension methods for setting up MVC services in an <see cref="IServiceCollection" />.     /// </summary>     public static class MvcServiceCollectionExtensions     {         /// <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               builder.AddCors();               return new MvcBuilder(builder.Services, builder.PartManager);         }           private static void AddDefaultFrameworkParts(ApplicationPartManager partManager)         {             var mvcTagHelpersAssembly = typeof(InputTagHelper).GetTypeInfo().Assembly;             if (!partManager.ApplicationParts.OfType<AssemblyPart>().Any(p => p.Assembly == mvcTagHelpersAssembly))             {                 partManager.ApplicationParts.Add(new FrameworkAssemblyPart(mvcTagHelpersAssembly));             }               var mvcRazorAssembly = typeof(UrlResolutionTagHelper).GetTypeInfo().Assembly;             if (!partManager.ApplicationParts.OfType<AssemblyPart>().Any(p => p.Assembly == mvcRazorAssembly))             {                 partManager.ApplicationParts.Add(new FrameworkAssemblyPart(mvcRazorAssembly));             }         }           /// <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;         }           [DebuggerDisplay("{Name}")]         private class FrameworkAssemblyPart : AssemblyPart, ICompilationReferencesProvider         {             public FrameworkAssemblyPart(Assembly assembly)                 : base(assembly)             {             }               IEnumerable<string> ICompilationReferencesProvider.GetReferencePaths() => Enumerable.Empty<string>();         }     } }