Azure Blob Storage: Download all logs from Azure Storage Container "$logs" using C# - azure

Question

I am trying to download all the logs from the Container "$logs", but it always throws a Exception -
"Could not find a part of the path 'C:\logs\blob\2020\05\24\2300\000000.log'"
public static void GetAnalyticsLogs(CloudBlobClient blobClient, CloudTableClient tableClient)
{
try
{
DateTime time = DateTime.UtcNow;
CloudAnalyticsClient analyticsClient = new CloudAnalyticsClient(blobClient.StorageUri, tableClient.StorageUri, tableClient.Credentials);
IEnumerable<ICloudBlob> results = analyticsClient.ListLogs(StorageService.Blob, time.AddDays(-30), null, LoggingOperations.All, BlobListingDetails.Metadata, null, null);
List<ICloudBlob> logs = results.ToList();
foreach (var item in logs)
{
string name = ((CloudBlockBlob)item).Name;
CloudBlobContainer container = blobClient.GetContainerReference("$logs");
CloudBlockBlob blockBlob = container.GetBlockBlobReference(name);
string path = (#"C:/logs/" + name);
using (var fileStream = System.IO.File.Create(path))
{
blockBlob.DownloadToStream(fileStream);
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
How can we solve this error?

Answer 1

The reason is that the path contains directories, but the File.Create() method cannot create a file inside a directory if the directory does not exist. So you should create the directory first, then create the file using File.Create() method.
The code below works fine at my side:
public static void GetAnalyticsLogs(CloudBlobClient blobClient, CloudTableClient tableClient)
{
try
{
DateTime time = DateTime.UtcNow;
CloudAnalyticsClient analyticsClient = new CloudAnalyticsClient(blobClient.StorageUri, tableClient.StorageUri, tableClient.Credentials);
IEnumerable<ICloudBlob> results = analyticsClient.ListLogs(StorageService.Blob, time.AddDays(-30), null, LoggingOperations.All, BlobListingDetails.Metadata, null, null);
List<ICloudBlob> logs = results.ToList();
foreach (var item in logs)
{
string name = ((CloudBlockBlob)item).Name;
CloudBlobContainer container = blobClient.GetContainerReference("$logs");
CloudBlockBlob blockBlob = container.GetBlockBlobReference(name);
//specify the directory without file name
string sub_folder = name.Remove(name.LastIndexOf("/") + 1);
string path = (#"C:/logs/" + sub_folder);
//create the directory if it does not exist.
Directory.CreateDirectory(path);
//specify the file full path
string file_path= (#"C:/logs/" + name);
using (var fileStream = File.Create(file_path))
{
blockBlob.DownloadToStream(fileStream);
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
}