public async Task DeleteArchivedBlobsAsync(BlobServiceClient blobServiceClient, string blobContainerName, string blobNameFormat, int retainedBlobCountLimit)
{
if (retainedBlobCountLimit < 1)
{
throw new ArgumentException("Invalid value provided; retained blob count limit must be at least 1 or null.");
}
BlobContainerClient blobContainer = blobServiceClient.GetBlobContainerClient(blobContainerName);
List <BlobItem> logBlobs = new List <BlobItem>();
AsyncPageable <BlobItem> blobItems = blobContainer.GetBlobsAsync();
IAsyncEnumerator <BlobItem> enumerator = blobItems.GetAsyncEnumerator();
try
{
while (await enumerator.MoveNextAsync())
{
logBlobs.Add(enumerator.Current);
}
}
finally
{
await enumerator.DisposeAsync();
}
IEnumerable <BlobItem> validLogBlobs = logBlobs.Where(blobItem => DateTime.TryParseExact(
RemoveRolledBlobNameSerialNum(blobItem.Name),
blobNameFormat,
CultureInfo.InvariantCulture,
DateTimeStyles.AssumeLocal,
out var _date));
IEnumerable <BlobItem> blobsToDelete = validLogBlobs
.OrderByDescending(blobItem => blobItem.Name)
.Skip(retainedBlobCountLimit);
foreach (var blobItem in blobsToDelete)
{
AppendBlobClient blobToDelete = blobContainer.GetAppendBlobClient(blobItem.Name);
await blobToDelete.DeleteIfExistsAsync();
}
}
