public static long?GetRowCount(string streamPath)
{
var certificate = CertificateGenerator.GetCertificateByThumbprint();
var settings = new Microsoft.Cosmos.ExportClient.ScopeExportSettings();
settings.Path = streamPath;
settings.ClientCertificate = certificate;
var exportClient = new Microsoft.Cosmos.ExportClient.ExportClient(settings);
try
{
return(exportClient.GetRowCount(null).Result);
}
// we cannot catch the exception "CosmosFileNotFoundException" by using CosmosUriException,
//catch (Microsoft.Cosmos.CosmosUriException e)
// and we either cannot use this exception "CosmosFileNotFoundException".
// For the asynchronous function GetRowCount(We can see its return is a subclass of Task), its exception will be packaged as AggregateException, we cannot directly catch it.
catch (CosmosFileNotFoundException e)
{
return(null);
}
// We just can catch AggregateException and judge it in AggregateException.InnerException
// AggregateException: Represents one or more errors that occur during application execution.
// Doc link: https://docs.microsoft.com/en-us/dotnet/api/system.aggregateexception?view=netframework-4.8
catch (AggregateException e)
{
// Here we just want to catch the Exception "CosmosFileNotFoundException", if it is not the reason, we will throw the exception.
if (e.InnerException.GetType() == typeof(CosmosFileNotFoundException))
{
Console.WriteLine("Cannot find the file...");
return(null);
}
if (e.InnerException.GetType() == typeof(CosmosDirectoryNotFoundException))
{
Console.WriteLine("Cannot find the directory...");
return(null);
}
if (e.InnerException.GetType() == typeof(CosmosArgumentException))
{
Console.WriteLine($"CosmosArgumentException...{e.InnerException.Message}");
return(null);
}
throw;
}
// This can catch any exception..
catch (Exception e)
{
Console.WriteLine($"Message: {e}; Type: {e.GetType()}");
return(null);
}
}
public void Export(string stream, string filename)
{
var settings = new Microsoft.Cosmos.ExportClient.ScopeExportSettings();
settings.Path = stream;
var exportClient = new Microsoft.Cosmos.ExportClient.ExportClient(settings);
// Top
if (this.Top > 0)
{
settings.Top = this.Top;
}
// Columns
settings.ColumnFilters = this.Columns;
// Partitions
// if PartitionIndices is set to null, or not set, default to get all partitions
settings.PartitionIndices = exportClient.GetAllPartitionIndices(null).Result;
try
{
var task = exportClient.Export(null, new System.Threading.CancellationToken());
var readTask = task.ContinueWith((prevTask) =>
{
using (Microsoft.Cosmos.ExportClient.IExportDataReader dataReader = prevTask.Result.DataReader)
{
OutputToFile(dataReader, filename, this.Separator, this.Terminator);
Console.WriteLine("New Thread");
}
});
readTask.Wait();
}
catch (System.AggregateException ae)
{
//System.Console.WriteLine(ae.ToString());
throw;
}
}
// This function also just can check the existing of file not directory.
public static bool CheckExists(string streamPath, out long rowCount)
{
var certificate = CertificateGenerator.GetCertificateByThumbprint();
var settings = new Microsoft.Cosmos.ExportClient.ScopeExportSettings();
settings.Path = streamPath;
settings.ClientCertificate = certificate;
var exportClient = new Microsoft.Cosmos.ExportClient.ExportClient(settings);
try
{
rowCount = exportClient.GetRowCount(null).Result;
return(true);
}
catch (Exception e)
{
Console.WriteLine($"Message: {e.Message}; Type: {e.GetType()}");
rowCount = -1;
return(false);
}
}
