azure CloudBlobDirectory.ListBlobs() returns "The specified resource does not exist.", but fetchAttributes() works using same data - azure

Question

I am getting a "The specified resource does not exist" exception when I try to iterate the result of a ListBlobs() call. I can get the blob attributes when I access it directly, but I'm trying to get a list of all the blobs in the subdirectory.
I wrote this little test to see exactly where the problem is. I have a test driver and two methods here. The first method, "GetBlockBlobDateTime" runs fine and returns a date time of an existing blob. The second method "GetBlobDirFiles" uses the same inputs and throws the excpetion when I try to iterate the blobItems at.
foreach (IListBlobItem blobItem in blobItems)
Note that the same data is used for both methods. What am I missing?
public static void DoTest(string baseURL, string container, string directory, string fileName)
{
DateTime t = GetBlockBlobDateTime( baseURL, container, directory, fileName);
List<string> fileList = GetBlobDirFiles( baseURL, container, directory);
}
public static DateTime GetBlockBlobDateTime(string baseURL, string container, string directory, string fileName)
{
CloudBlobClient blobClient = new CloudBlobClient(baseURL);
CloudBlobDirectory blobDir = blobClient.GetBlobDirectoryReference(container);
CloudBlobDirectory subDirectory = blobDir.GetSubdirectory(directory);
CloudBlockBlob cloudBlockBlob = subDirectory.GetBlockBlobReference(fileName);
cloudBlockBlob.FetchAttributes();
DateTime cloudTimeStampUTC = cloudBlockBlob.Properties.LastModifiedUtc;
return cloudTimeStampUTC;
}
public static List<string> GetBlobDirFiles(string baseURL, string container, string directory)
{
CloudBlobClient blobClient = new CloudBlobClient(baseURL);
CloudBlobDirectory blobDir = blobClient.GetBlobDirectoryReference(container);
CloudBlobDirectory subDirectory = blobDir.GetSubdirectory(directory);
IEnumerable<IListBlobItem> blobItems = subDirectory.ListBlobs();
List<string> fileList = new List<string>();
foreach (IListBlobItem blobItem in blobItems)
{
fileList.Add(blobItem.Uri.ToString());
}
return fileList;
}

Answer 1

OK, I figured it out:
Apparently, you don't need permissions to get file attributes, but you do to list files in the directory.
CloudBlobClient blobClient = new CloudBlobClient(baseURL);
works when you are going to fetch attributes like this:
cloudBlockBlob.FetchAttributes();
But you need to provide credentials like this:
CloudBlobClient blobClient =
new CloudBlobClient(baseURL,
new StorageCredentialsAccountAndKey(myAccount, myKey));
when you are going to list the blobs like this:
var blobList = subDirectory.ListBlobs();
foreach (var blobInfo in blobList)