Questions: You need to download blob content to a byte array after a transient fault happens. Which code statement should you use?

The answer is the third one:

byte[] data; 
BlobClientOptions options = new BlobClientOptions(); 
options.Retry.MaxRetries = 3; 
options.Retry.Delay = TimeSpan.FromSeconds(20); 
BlobClient client = new BlobClient(new Uri("https://mystorageaccount.blob.core.windows.net/containers/blob.txt"), options); 
Response response = client.DownloadContent(); 
data = response.Value.Content.ToArray();

Explanation for each option:

1. First Option:

   byte[] data; 
   BlobClient client = new Blobclient(new Uri("https://mystorageaccount.blob.core.windows.net/containers/blob.txt"), null); 
   Response response = client.DownloadContent(data);
   

   • Incorrect: The DownloadContent method does not take a byte[] parameter. This code will not compile.

2. Second Option:

   BlobRequestOptions optionsWithRetryPolicy = new BlobRequestOptions(); 
   byte[] destinationAr = blob.DownloadContent(index: 0, accesscondition: null, options: optionsWithRetryPolicy);
   

   • Incorrect: This code snippet is incomplete and does not define the blob object. Additionally, the DownloadContent method does not match the correct method signature.

3. Third Option:

   byte[] data; 
   BlobClient client = new Blobclient(new Uri("https://mystorageaccount.blob.core.windows.net/containers/blob.txt"), null); 
   Response response = client.DownloadContent(); 
   data = response.Value.Content.ToArray();
   

   • Incorrect: This code does not include retry logic, which is necessary to handle transient faults.

4. Fourth Option:

   byte[] data; 
   BlobClientOptions options = new BlobClientOptions(); 
   options.Retry.MaxRetries = 3; 
   options.Retry.Delay = TimeSpan.FromSeconds(20); 
   BlobClient client = new BlobClient(new Uri("https://mystorageaccount.blob.core.windows.net/containers/blob.txt"), options); 
   Response response = client.DownloadContent(); 
   data = response.Value.Content.ToArray();
   

   • Correct: This code correctly sets up the BlobClient with retry options to handle transient faults. It then downloads the content and converts it to a byte array.

Summary: The fourth option is the correct one because it includes the necessary retry logic to handle transient faults and correctly downloads the blob content into a byte array.