private IEnumerable<Transfer> AllTransfers(CancellationToken cancellationToken)
{
// return all existing transfers in subTransfers
foreach (var transfer in this.subTransfers.GetEnumerator())
{
Utils.CheckCancellation(cancellationToken);
transfer.Context = this.Context;
transfer.ContentType = this.ContentType;
this.UpdateTransfer(transfer);
yield return transfer;
}
// list new transfers
if (this.enumerateContinuationToken != null)
{
this.SourceEnumerator.EnumerateContinuationToken = this.enumerateContinuationToken.ListContinuationToken;
}
var enumerator = this.SourceEnumerator.EnumerateLocation(cancellationToken).GetEnumerator();
while (true)
{
Utils.CheckCancellation(cancellationToken);
// lock enumerator
if (!enumerator.MoveNext())
{
yield break;
}
TransferEntry entry = enumerator.Current;
ErrorEntry errorEntry = entry as ErrorEntry;
if (errorEntry != null)
{
TransferException exception = errorEntry.Exception as TransferException;
if (null != exception)
{
throw exception;
}
else
{
throw new TransferException(
TransferErrorCode.FailToEnumerateDirectory,
errorEntry.Exception.GetExceptionMessage(),
errorEntry.Exception);
}
}
Transfer transfer = this.CreateTransfer(entry);
lock (this.lockEnumerateContinuationToken)
{
this.subTransfers.AddTransfer(transfer);
this.enumerateContinuationToken = new SerializableListContinuationToken(entry.ContinuationToken);
}
yield return transfer;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="MultipleObjectsTransfer"/> class.
/// </summary>
/// <param name="info">Serialization information.</param>
/// <param name="context">Streaming context.</param>
protected MultipleObjectsTransfer(SerializationInfo info, StreamingContext context)
: base(info, context)
{
this.enumerateContinuationToken = (SerializableListContinuationToken)info.GetValue(ListContinuationTokenName, typeof(SerializableListContinuationToken));
this.subTransfers = (TransferCollection)info.GetValue(SubTransfersName, typeof(TransferCollection));
this.subTransfers.OverallProgressTracker.Parent = this.ProgressTracker;
}
/// <summary>
/// Initializes a new instance of the <see cref="MultipleObjectsTransfer"/> class.
/// </summary>
/// <param name="other">Another <see cref="MultipleObjectsTransfer"/> object.</param>
protected MultipleObjectsTransfer(MultipleObjectsTransfer other)
: base(other)
{
lock (other.lockEnumerateContinuationToken)
{
// copy enumerator
this.enumerateContinuationToken = other.enumerateContinuationToken;
// copy transfers
this.subTransfers = other.subTransfers.Copy();
}
this.subTransfers.OverallProgressTracker.Parent = this.ProgressTracker;
}