/// <summary>
/// Delete a file from blob
/// exits if file not found
/// </summary>
/// <param name="containerName"></param>
/// <param name="fileName"></param>
internal static void DeleteBlob(string fileName)
{
CloudBlockBlob blockBlob = AzureBlob.BlobContainer.GetBlockBlobReference(fileName);
if (blockBlob.Exists())
{
AzureBlob.DeleteBlob(blockBlob);
}
}
/// <summary>
/// Download Block Blob within specificed Container
/// </summary>
/// <param name="tmpFilePath"></param>
/// <param name="containerName"></param>
/// <param name="fileName"></param>
internal static string DownloadBlob(string fileName, int cacheDurationSeconds)
{
CloudBlockBlob blockBlob = AzureBlob.BlobContainer.GetBlockBlobReference(fileName);
if (blockBlob.Exists())
{
//check if blob is stale
if (AzureBlob.IsStale(blockBlob, cacheDurationSeconds))
{
AzureBlob.DeleteBlob(blockBlob);
}
else
{
using (MemoryStream stream = new MemoryStream())
{
int attempt = 0;
int MaxAttempts = 3;
while (++attempt <= MaxAttempts)
{
try
{
blockBlob.DownloadToStream(stream);
break;
}
catch (Exception ex)
{
if (attempt == MaxAttempts)
{
throw ex;
}
Thread.Sleep(100);
}
}
string res = System.Text.Encoding.UTF8.GetString(stream.ToArray());
}
}
}
return(null);
}
