public async Task <string> CopyBlobAsync(CloudBlockBlob sourceBlob, CloudBlockBlob targetBlob, CancellationToken token)
{
bool tryCopy = true;
string copyId = string.Empty;
int retryCount = 3;
TimeSpan timeOut = TimeSpan.FromMinutes(3);
while (tryCopy)
{
if (!string.IsNullOrEmpty(copyId))
{
await targetBlob.AbortCopyAsync(copyId, token);
}
DateTime startTime = DateTime.Now;
copyId = await targetBlob.StartCopyAsync(sourceBlob, token);
while ((DateTime.Now - startTime) < timeOut)
{
Thread.Sleep(100);
await targetBlob.FetchAttributesAsync(token);
switch (targetBlob.CopyState.Status)
{
case CopyStatus.Invalid:
case CopyStatus.Pending:
continue;
case CopyStatus.Success:
return(targetBlob.Uri.AbsoluteUri);
case CopyStatus.Aborted:
case CopyStatus.Failed:
default:
retryCount--;
if (retryCount == 0)
{
tryCopy = false;
}
break;
}
}
}
throw new Exception("Copy blob failed");
}
