我試圖在配置方法中獲得一些服務,這樣我就可以使我的數據庫更容易。配置方法中的asp net內核請求服務返回null
所以我注入的IServiceProvider在我的配置方法,但每次我這樣做:var service = serviceProvider.GetService<UserService>();
返回null ...
這裏是我的代碼:
public class Startup
{
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
builder.AddEnvironmentVariables();
Configuration = builder.Build();
}
public IConfigurationRoot Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(this.Configuration.GetConnectionString("DbConnectionString")));
// Add framework services.
services.AddIdentity<IdentityUser, IdentityRole>().AddEntityFrameworkStores<IdentityDbContext>().AddDefaultTokenProviders();
string connection = this.Configuration.GetConnectionString("DbConnectionString");
services.AddEntityFramework();
services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(connection));
services.AddIdentity<ApplicationUser, IdentityRole>()
.AddEntityFrameworkStores<ApplicationDbContext>()
.AddDefaultTokenProviders();
services.Configure<AppSettings>(this.Configuration.GetSection("AppSettings"));
services.AddScoped<IsAuthorized>();
services.AddSingleton<UserManager<ApplicationUser>>();
services.AddTransient<IUsersService, UserService>();
services.AddMvc(config => { config.Filters.Add(typeof(SingletonUsers)); });
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IServiceProvider services)
{
loggerFactory.AddConsole(this.Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
app.UseMvc();
// This returns the context.
var context = services.GetService<ApplicationDbContext>();
// This returns null.
var userService = services.GetService<UserService>();
// Can't work without the UserService
MyDbInitializer.Initialize(context, userService);
}
}
你需要使用接口:'VAR userService =服務.GetService();' –
Set
是的,它做到了,謝謝! –