为什么CloudBlockBlob.StartCopyAsync有时只写0个字节？

问题描述

我遇到一种情况，有时CloudBlockBlob.StartCopyAsync仅将0字节的数据写入输入资产的斑点...应该是什么情况？因此，我决定在不增加块Blob长度的情况下开始复制...有什么建议吗？

private async Task CreateInputAssetBlobAsync(UploadRequest request)
{
    var cloudBlobContainer = new CloudBlobContainer(request.InputAssetStorageUri);
    var blockBlob = cloudBlobContainer.GetBlockBlobReference(request.BlobName);

    var storageCredentials = new Microsoft.Azure.Storage.Auth.StorageCredentials(_apiAccess.TempBlobAccountName,_apiAccess.TempBlobContainerKey);
    var tempBlobContainer = new CloudBlobContainer(new Uri(_apiAccess.TempBlobContainerAddress),storageCredentials);
    var tempBlockBlob = tempBlobContainer.GetBlockBlobReference(request.BlobName);

    try
    {
        await blockBlob.StartCopyAsync(tempBlockBlob);

        do
        {
            if (blockBlob.CopyState.Status == CopyStatus.Pending)
                await Task.Delay(1000);
            await blockBlob.FetchAttributesAsync();
        }
        while (blockBlob.CopyState.Status != CopyStatus.Success);

        return;
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
        throw;
    }
}

解决方法

要复制Blob内容，应使用以下代码。

有关更多详细信息，您可以download my sample in github(BlobContainerCopy)。它有效，我认为对您有用。

您也可以参考这篇文章。希望我在这篇文章中的回答也能对您有所帮助。

Error during storage blob copy operation - The requested operation is not allowed in the current state of the entity

foreach (ICloudBlob sourceBlobRef in sourceBlobRefs)
{
    if (sourceBlobRef.Properties.ContentType != null)
    {
        // Copy the source blob
        CloudBlockBlob destBlob = destContainer.GetBlockBlobReference(sourceBlobRef.Name);

        try
        {
            //exception throwed here  - StartCopyAsync
            await destBlob.StartCopyAsync(new Uri(GetSharedAccessUri(sourceBlobRef.Name,sourceContainer)));

            ICloudBlob destBlobRef = await destContainer.GetBlobReferenceFromServerAsync(sourceBlobRef.Name);
            while (destBlobRef.CopyState.Status == CopyStatus.Pending)
            {
                Console.WriteLine($"Blob: {destBlobRef.Name},Copied: {destBlobRef.CopyState.BytesCopied ?? 0} of  {destBlobRef.CopyState.TotalBytes ?? 0}");
                await Task.Delay(500);
                destBlobRef = await destContainer.GetBlobReferenceFromServerAsync(sourceBlobRef.Name);
            }
            Console.WriteLine($"Blob: {destBlob.Name} Complete");
        }
        catch (Exception e)
        {
            Console.WriteLine($"Blob: {destBlob.Name} Copy Failed");
        }
    }
}