public async Task <DateTime?> LoadLatestScanAsync(string storageAccountName, string containerName)
{
IStorageBlockBlob scanInfoBlob = GetScanInfoBlobReference(storageAccountName, containerName);
DateTime? latestScan = null;
try
{
string scanInfoLine = await scanInfoBlob.DownloadTextAsync(CancellationToken.None);
ScanInfo scanInfo;
using (StringReader stringReader = new StringReader(scanInfoLine))
{
scanInfo = (ScanInfo)_serializer.Deserialize(stringReader, typeof(ScanInfo));
}
if (scanInfo != null)
{
latestScan = scanInfo.LatestScan;
}
return(latestScan);
}
catch (StorageException exception)
{
if (exception.IsNotFound())
{
// we haven't saved any scanInfo yet
return(null);
}
throw;
}
}
private static async Task <string> TryDownloadAsync(IStorageBlockBlob blob, CancellationToken cancellationToken)
{
try
{
return(await blob.DownloadTextAsync(cancellationToken));
}
catch (StorageException exception)
{
if (exception.IsNotFound())
{
return(null);
}
else
{
throw;
}
}
}
private static async Task<string> TryDownloadAsync(IStorageBlockBlob blob, CancellationToken cancellationToken)
{
try
{
return await blob.DownloadTextAsync(cancellationToken);
}
catch (StorageException exception)
{
if (exception.IsNotFound())
{
return null;
}
else
{
throw;
}
}
}
