Question

如何自动将新类实例添加到数组中？

示例：

internal class AuthenticationHelper
    {

        /// <summary>
        ///     Async task to acquire token for Application.
        /// </summary>
        /// <returns>Async Token for application.</returns>
        public static async Task<string> AcquireTokenAsync()
        {
            string clientId = ConfigurationManager.AppSettings["ida:ClientID"];
            string appKey = ConfigurationManager.AppSettings["ida:AppKey"];
            string graphResourceID = Constants.ResourceUrl;
            string signedInUserID = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier).Value;
            string tenantID = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid").Value;
            string userObjectID = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;

            // get a token for the Graph without triggering any user interaction (from the cache, via multi-resource refresh token, etc)
            ClientCredential clientcred = new ClientCredential(clientId, appKey);
            // initialize AuthenticationContext with the token cache of the currently signed in user, as kept in the app's EF DB
            AuthenticationContext authContext = new AuthenticationContext(string.Format("https://login.microsoftonline.com/{0}", tenantID), new EFADALTokenCache(signedInUserID));
            AuthenticationResult result = await authContext.AcquireTokenSilentAsync(graphResourceID, clientcred, new UserIdentifier(userObjectID, UserIdentifierType.UniqueId));
            return result.AccessToken;
        }

        /// <summary>
        ///     Get Active Directory Client for Application.
        /// </summary>
        /// <returns>ActiveDirectoryClient for Application.</returns>
        public static ActiveDirectoryClient GetActiveDirectoryClient()
        {
            string tenantID = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid").Value;
            Uri baseServiceUri = new Uri(Constants.ResourceUrl);
            ActiveDirectoryClient activeDirectoryClient =
                new ActiveDirectoryClient(new Uri(baseServiceUri, tenantID),
                    async () => await AcquireTokenAsync());
            return activeDirectoryClient;
        }
    }

如何将Product类的新实例添加到products数组？我怎样才能附加到数组？

我尝试了一些代码，但我不知道如何在自己的课程中引用该课程。

我试过这样的事情：

class Product {
    var name: String?
}

var products = [Product]()

谢谢！

Answer 1

如果您希望新创建的对象存储在products数组中，则需要将其声明为static属性，以便所有实例共享它，否则它只会为您的每个实例添加第一个对象

class Product {
    var name: String?
    static var products = [Product]()

    init() {
        Product.products.append(self)
    }

    init(name: String) {
        self.name = name
        Product.products.append(self)
    } 
}

现在使用products使用此Product.products数组。

_ = Product(name: "One")
_ = Product(name: "two")
print(Product.products)

Answer 2

您是否尝试过products.append(self)？

Answer 3

我不知道你为什么需要它，但你可以使用

class Product {
    static var products: [Product] = []

    var name: String?

    init() {
        products.append(self)
    }
}

在Swift中自动将类实例添加到数组中

3 个答案: