如何获得我刚刚复制到Azure存储帐户的CloudBlockBlob的大小？

我正在将Azure文件共享中的文件复制到存储容器中的CloudBlockBlob。在删除原始文件之前，我想验证两个位置的字节（.Properties.Length）是否相同。我认为这将是一个获得对复制的blob的新引用的情况，但是它总是-1

拷贝工作正常，对文件v blob的目视检查显示字节是相同的，只是不确定如何在我的C#应用程序中复制它

我遇到的问题是定义“复制”对象的行

---

要获取属性/元数据，首先需要使用方法

FetchAttributes（）

，该方法用于填充属性和元数据

请尝试以下代码：

    static void Main(string[] args)
    {
        string myfile = "123.txt";
        CloudStorageAccount storageAccount = new CloudStorageAccount(new StorageCredentials("account_name", "account_key"), true);

        CloudFileClient fileClient = storageAccount.CreateCloudFileClient();
        CloudFileShare fileShare = fileClient.GetShareReference("test");
        CloudFile sourceFile = fileShare.GetRootDirectoryReference().GetFileReference(myfile);

        sourceFile.FetchAttributes();
        Console.WriteLine("The source file length is: "+sourceFile.Properties.Length);

        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
        var container = blobClient.GetContainerReference("aa1");
        CloudBlockBlob destBlob = container.GetBlockBlobReference(myfile);

        string fileSAS = sourceFile.GetSharedAccessSignature(new SharedAccessFilePolicy() {
            Permissions = SharedAccessFilePermissions.Read,
            SharedAccessExpiryTime=DateTime.Now.AddHours(24)
        });

        Uri fileUri = new Uri(sourceFile.StorageUri.PrimaryUri.ToString() + fileSAS);
        Console.WriteLine("--copy started--");
        destBlob.StartCopy(fileUri);            

        destBlob = container.GetBlockBlobReference(myfile);
        destBlob.FetchAttributes();

        //use poll to check if the copy is completed or not.
        while (destBlob.CopyState.Status == CopyStatus.Pending)
        {
            Thread.Sleep(500);
            destBlob.FetchAttributes();
        }

        //when the copy completed, then check the copied file length.
        if (destBlob.CopyState.Status == CopyStatus.Success)
        {
            Console.WriteLine("the dest blob length is: " + destBlob.Properties.Length);
        }
        else
        {
            Console.WriteLine("the copy operation is failed!");
        }


        Console.ReadLine();
    }

测试结果如下：

源文件长度为：184227539

--开始复制--

目标blob长度为：184227539

您还可以参考屏幕截图了解更多详细信息

---

注意，您需要在

destBlob.StartCopy（fileUri）之后轮询复制状态，因为复制是在服务器端异步完成的。这里有一个类似的问题：@ZhaoxingLu微软，谢谢你指出！我只是认为StartCopy（）将在拷贝实际完成之前一直执行线程块。用轮询复制状态更新了我的答案。循环似乎还解决了另一个问题，即复制的blob是空的，这在大文件中更常见。我打算用异步方法重新编写这一部分，但您的代码似乎达到了相同的结果。我一开始并没有使用异步，因为我一次只执行一个拷贝。你能吗？谢谢
    static void Main(string[] args)
    {
        string myfile = "123.txt";
        CloudStorageAccount storageAccount = new CloudStorageAccount(new StorageCredentials("account_name", "account_key"), true);

        CloudFileClient fileClient = storageAccount.CreateCloudFileClient();
        CloudFileShare fileShare = fileClient.GetShareReference("test");
        CloudFile sourceFile = fileShare.GetRootDirectoryReference().GetFileReference(myfile);

        sourceFile.FetchAttributes();
        Console.WriteLine("The source file length is: "+sourceFile.Properties.Length);

        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
        var container = blobClient.GetContainerReference("aa1");
        CloudBlockBlob destBlob = container.GetBlockBlobReference(myfile);

        string fileSAS = sourceFile.GetSharedAccessSignature(new SharedAccessFilePolicy() {
            Permissions = SharedAccessFilePermissions.Read,
            SharedAccessExpiryTime=DateTime.Now.AddHours(24)
        });

        Uri fileUri = new Uri(sourceFile.StorageUri.PrimaryUri.ToString() + fileSAS);
        Console.WriteLine("--copy started--");
        destBlob.StartCopy(fileUri);            

        destBlob = container.GetBlockBlobReference(myfile);
        destBlob.FetchAttributes();

        //use poll to check if the copy is completed or not.
        while (destBlob.CopyState.Status == CopyStatus.Pending)
        {
            Thread.Sleep(500);
            destBlob.FetchAttributes();
        }

        //when the copy completed, then check the copied file length.
        if (destBlob.CopyState.Status == CopyStatus.Success)
        {
            Console.WriteLine("the dest blob length is: " + destBlob.Properties.Length);
        }
        else
        {
            Console.WriteLine("the copy operation is failed!");
        }


        Console.ReadLine();
    }