c# - 让 CloudBlobContainer 对象成为 transient 可以吗？

Question

我有一个服务类，其中包含一个名为 GetContainer 的方法，

    private CloudBlobContainer GetContainer(string blobConnectionString, string blobContainerName)
    {
        var storageAccount = CloudStorageAccount.Parse(blobConnectionString);
        var blobClient = storageAccount.CreateCloudBlobClient();
        return blobClient.GetContainerReference(blobContainerName);
    }

现在，每次需要执行类似操作时，服务方法都会调用此方法，

    public Task CopyAsync(string blobConnectionString, string blobContainerName, string sourceFile, string destinationFile)
    {
        var container = GetContainer(blobConnectionString, blobContainerName);
        return CopyInternalAsync(container, sourceFile, destinationFile);
    }

    private Task CopyInternalAsync(CloudBlobContainer container, string sourceFile, string destinationFile)
    {
        var sourceBlob = container.GetBlockBlobReference(sourceFile);
        var destinationBlob = container.GetBlockBlobReference(destinationFile);
        return destinationBlob.StartCopyFromBlobAsync(sourceBlob);
    }

我可以像 web-api 示例一样创建 CloudBlobContainer 单例 here 。但问题是我的 blob 连接字符串和容器名称未修复。我应该使用 ConcurrentDictionary 还是可以让 CloudBlobContainer 暂时使用？

Answer 1

GetContainerReference 和 GetBlockBlobReference 都是非常轻量级的操作 - 在您实际执行诸如 StartCopyFromBlobAsync 之类的操作之前，两者都不会与 Azure 通信如上所述。

参见https://github.com/Azure/azure-storage-net/blob/master/Lib/Common/Blob/CloudBlobClient.Common.cs#L288 :

public CloudBlobContainer GetContainerReference(string containerName)
{
    CommonUtility.AssertNotNullOrEmpty("containerName", containerName);
    return new CloudBlobContainer(containerName, this);
}

和https://github.com/Azure/azure-storage-net/blob/master/Lib/Common/Blob/CloudBlobContainer.Common.cs#L82 :

internal CloudBlobContainer(string containerName, CloudBlobClient serviceClient) : this(new BlobContainerProperties(), new Dictionary<string, string>(), containerName, serviceClient)
{
}

internal CloudBlobContainer(BlobContainerProperties properties, IDictionary<string, string> metadata, string containerName, CloudBlobClient serviceClient)
{
    this.StorageUri = NavigationHelper.AppendPathToUri(serviceClient.StorageUri, containerName);
    this.ServiceClient = serviceClient;
    this.Name = containerName;
    this.Metadata = metadata;
    this.Properties = properties;
}

它只是创建一个对象并将其返回给您 - 将其视为 transient 应该不是问题。