Question

我目前正在尝试构建一个密封的类，该类通过存储在JSON中的设置来获取Azure存储的配置。我将设置注册在startup.cs类中，然后将其注入到构造函数中。问题是当我需要在该类中启动同一类时，因为它是密封的类

public sealed class AzureFileStorage
{
    private static volatile AzureFileStorage instance;
    private static object syncRoot = new Object();
    private readonly AzureBlobSettings _azureBlobSettings;

    public CloudStorageAccount StorageAccount { get; private set; }
    public CloudBlobClient BlobClient { get; private set; }
    public CloudBlobContainer Container { get; private set; }

    public AzureFileStorage(IOptions<AzureBlobSettings> fbAuthSettingsAccessor)
    {
        _azureBlobSettings = fbAuthSettingsAccessor.Value;
        StorageAccount = CloudStorageAccount.Parse(_azureBlobSettings.BlobStorageConnectionString);

        //instantiate the client
        BlobClient = StorageAccount.CreateCloudBlobClient();

        //set the container
        Container = BlobClient.GetContainerReference(_azureBlobSettings.ContainerBlobAzureId);

    }

    public static AzureFileStorage Instance
    {
        get
        {
            if (instance == null)
            {
                lock (syncRoot)
                {

                    if (instance == null)
                        instance = new AzureFileStorage(????);
                }
            }

            return instance;
        }
    }
}

如果通过依赖项注入传递了azureblobsettings，我该如何初始化azurefilestorage。

Answer 1

正如评论者所暗示的那样，当前设计不适用于依赖项注入。

应该重构AzureFileStorage类，以删除单例实例，并使其具有自己的抽象。

public interface IAzureFileStorage {
    CloudStorageAccount StorageAccount { get; }
    CloudBlobClient BlobClient { get; }
    CloudBlobContainer Container { get; }
}

public sealed class AzureFileStorage : IAzureFileStorage {
    private readonly AzureBlobSettings _azureBlobSettings;


    public AzureFileStorage(IOptions<AzureBlobSettings> fbAuthSettingsAccessor) {
        _azureBlobSettings = fbAuthSettingsAccessor.Value;
        StorageAccount = CloudStorageAccount.Parse(_azureBlobSettings.BlobStorageConnectionString);

        //instantiate the client
        BlobClient = StorageAccount.CreateCloudBlobClient();

        //set the container
        Container = BlobClient.GetContainerReference(_azureBlobSettings.ContainerBlobAzureId);
    }

    public CloudStorageAccount StorageAccount { get; private set; }
    public CloudBlobClient BlobClient { get; private set; }
    public CloudBlobContainer Container { get; private set; }
}

并在服务集合中注册为单身人士

public void ConfigureServices(IServiceCollection services) {

    //...

    service.AddSingleton<IAzureFileStorage, AzureFileStorage>();

    //...
}

为了将IAzureFileStorage显式地注入到任何地方，

private readonly IAzureFileStorage fileStore;

public SomeClass(IAzureFileStorage fileStore) {
    this.fileStore = fileStore;
}

同一实例将在整个应用程序中使用。

对密封类的类实例的依赖注入

1 个答案: