asp.net核心2.1依赖注入
asp.net核心2.1依赖注入
提问于 2019-02-28 23:23:40
在asp.net Core2.1MVC应用程序中，我有以下代码，这些代码来自于Github，来自于一个块，还有一些由我自己添加的代码：
public static IServiceCollection AddIdentityMongoDbProvider<TUser, TRole>(this IServiceCollection services, Action<IdentityOptions> setupIdentityAction, Action<MongoIdentityOptions> setupDatabaseAction) where TUser : UserEntity where TRole : RoleEntity
{
services.AddIdentity<TUser, TRole>(setupIdentityAction ?? (x => { }))
.AddRoleStore<RoleStore<TRole>>()
.AddUserStore<UserStore<TUser, TRole>>()
.AddDefaultTokenProviders();
var dbOptions = new MongoIdentityOptions();
setupDatabaseAction(dbOptions);
var userCollection = new IdentityUserCollection<TUser>(dbOptions.DbType, dbOptions.ConnectionString);
var roleCollection = new IdentityRoleCollection<TRole>(dbOptions.DbType, dbOptions.ConnectionString);
// Add collections and stores in services for DI
services.AddTransient<IIdentityUserCollection<TUser>>(x => userCollection);
services.AddTransient<IIdentityRoleCollection<TRole>>(x => roleCollection);
services.AddTransient<ITenantStore<TenantEntity, TUser>>(x => new TenantStore<TenantEntity, TUser>(dbOptions.DbType, dbOptions.ConnectionString, userCollection));
services.AddTransient<ILicenseStore<LicenseEntity>>(x => new LicenseStore<LicenseEntity>(dbOptions.DbType, dbOptions.ConnectionString));
// Identity Services
services.AddTransient((Func<IServiceProvider, IUserStore<TUser>>)(x => new UserStore<TUser, TRole>(userCollection, roleCollection, x.GetService<ILookupNormalizer>())));
services.AddTransient<IRoleStore<TRole>>(x => new RoleStore<TRole>(roleCollection));
return services;
}所以你可以看到它使用的是依赖注入，但我在问自己一些问题：
1) userCollection和roleCollection是“局部”变量，然后传递给DI。但是这些对象的生命周期是如何管理的呢？我的意思是，它们从来没有被处理过，因为它们被用在DI中吗？或者他们每次都在创建？
2)这两者有什么区别吗？
services.AddTransient<ILicenseStore<LicenseEntity>>(x => new LicenseStore<LicenseEntity>(dbOptions.DbType, dbOptions.ConnectionString));和
services.AddTransient<ILicenseStore<LicenseEntity>>(new LicenseStore<LicenseEntity>(dbOptions.DbType, dbOptions.ConnectionString));3)在队列中
services.AddTransient((Func<IServiceProvider, IUserStore<TUser>>)(x => new UserStore<TUser, TRole>(userCollection, roleCollection, x.GetService<ILookupNormalizer>())));这就是“x.GetService()”。这是一种告诉构造函数构造函数中需要的参数将来自DI的方法吗？在DependecyInjection中使用依赖注入吗？
4)如果对问题3的回答是“是”，是否可以这样做？
services.AddSingletion<IMongoClient>(new MongoClient("connectionString"));
services.AddTransient<IXStore>(new XStore(x.GetService<IMongoClient>()))重点是要实现MongoClient将是单例的(这是推荐的方式)
5)两者的区别是什么：
services.AddScoped((Func<IServiceProvider, IUserStore<TUser>>)(x => new UserStore<TUser, TRole>(x.GetRequiredService<IIdentityUserCollection<TUser>>(), x.GetRequiredService<IIdentityRoleCollection<TRole>>(), x.GetService<ILookupNormalizer>())));和
services.AddScoped<IUserStore<TUser>, UserStore<TUser, TRole>>();非常感谢您的回答:)
编辑：
新方法：
services.AddSingleton<ICustomMongoClient>(x => new CustomMongoClient(dbOptions.ConnectionString));
// Add collections and stores in services for DI
services.AddTransient<IIdentityUserCollection<TUser>>(x => new IdentityUserCollection<TUser>(x.GetRequiredService<ICustomMongoClient>()));
services.AddTransient<IIdentityRoleCollection<TRole>>(x => new IdentityRoleCollection<TRole>(x.GetRequiredService<ICustomMongoClient>()));
services.AddTransient<ITenantStore<TenantEntity, TUser>>(x => new TenantStore<TenantEntity, TUser>(x.GetRequiredService<ICustomMongoClient>(), x.GetRequiredService<IIdentityUserCollection<TUser>>()));
services.AddTransient<ILicenseStore<LicenseEntity>>(x => new LicenseStore<LicenseEntity>(x.GetRequiredService<ICustomMongoClient>()));
// Identity Services
services.AddTransient((Func<IServiceProvider, IUserStore<TUser>>)(x => new UserStore<TUser, TRole>(x.GetRequiredService<IIdentityUserCollection<TUser>>(), x.GetRequiredService<IIdentityRoleCollection<TRole>>(), x.GetService<ILookupNormalizer>())));
services.AddTransient<IRoleStore<TRole>>(x => new RoleStore<TRole>(x.GetRequiredService<IIdentityRoleCollection<TRole>>()));页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54929014
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