System.ArgumentException: An item with the same key has already been added.

[OleksandrNovik]

Hi!

I would like to report issue that I recently came accross working with AsyncFtpClient. Package ver: 53.0.1

DownloadDirectory method can throw ArgumentException due to usage of ToLower() on localFile path in shouldExist dictionary. I think this is because the files have different names when case-sensitive checking is enabled, but if you convert them to lowercase, they become identical.

Here is also detailed stack trace of the issue:

System.ArgumentException: An item with the same key has already been added. at System.Collections.Generic.Dictionary2.TryInsert(TKey key, TValue value, InsertionBehavior behavior) at System.Collections.Generic.Dictionary2.Add(TKey key, TValue value) at FluentFTP.Client.Modules.FileDownloadModule.RecordFileToDownload(BaseFtpClient client, List1 rules, List1 results, Dictionary2 shouldExist, List1 toDownload, FtpListItem remoteFile, String localFile, String remoteFilePath) at FluentFTP.Client.Modules.FileDownloadModule.GetFilesToDownload(BaseFtpClient client, String localFolder, String remoteFolder, List1 rules, List1 results, FtpListItem[] listing, Dictionary2 shouldExist) at FluentFTP.AsyncFtpClient.DownloadDirectory(String localFolder, String remoteFolder, FtpFolderSyncMode mode, FtpLocalExists existsMode, FtpVerify verifyOptions, List1 rules, IProgress1 progress, CancellationToken token)

I also referenced the line that may cause this issue. You can check it out here

Hope this information will be helpful.

All the best!

[FanDjango]

Partly a duplicate of #1794, perhaps? Thanks for reporting.

[OleksandrNovik]

Partly a duplicate of #1794, perhaps? Thanks for reporting.

Yes, my problem is a duplicate of the one you refer to. Sorry, I didn't see this problem already discussed.