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System.InvalidCastException: Unable to cast object of type 'System.Collections.Generic.List`1[Renci.SshNet.Sftp.SftpFile]' to type 'System.Collections.ArrayList'.

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Hi,

I am trying to download all files from SFTP using Renci.SSHNET library.

My code is as follows:

Renci.SshNet.SftpClient cliente;

System.Collections.ArrayList list;

cliente = new Renci.SshNet.SftpClient(sftpHost,sftpPort,sftpUserName,sftpPassword);

cliente.Connect();

cliente.ChangeDirectory("outbound");

list = cliente.ListDirectory("/outbound/",null);

It works perfect when I run on client. But when I run on batch it throws the error below: System.InvalidCastException: Unable to cast object of type 'System.Collections.Generic.List`1[Renci.SshNet.Sftp.SftpFile]' to type 'System.Collections.ArrayList'.

Any ideas? how can I run this class on batch?

Thanks.

Svl.

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Answers (1)

Martin Dráb 239,040 Most Valuable Professional on at

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It means that the method returns List<SftpFile> and you're trying to assign it to ArrayList, which fails because these types are not compatible. What you should do instead depends on what you're trying to achieve - please tell us what you want to do with the list.

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Community Member on at

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Hi Martin, thanks for your reply.

I want to get the number of files in the directory, then download the files with the specific prefixes. But it fails because of the incompatible types when i try to run on server.

My method continues like that:

..

fileCount = List.get_Count();

for(i = 0;i < filecount; i++)

{

lists.empty();

packedList = conNull();

files = list.get_Item(i);

strlist = files.ToString();

lists=strSplit(strlist,',');

iterator = new ListIterator(lists);

if(iterator.more())

{

packedList += iterator.value();

iterator.next();

}

prefix = subStr(conPeek(packedList,1),6,7);

if(prefix == "SKA_" || prefix == "SKS_")

{

fileName = subStr(conPeek(packedList,1),6,30);

targetFile = System.IO.Path::Combine(myPath,fileName);

memStream = new System.IO.FileStream(targetFile,System.IO.FileMode::Create);

asyncResult = cliente.BeginDownloadFile(fileName, memStream);

cliente.EndDownloadFile(asyncResult);

memstream.Close();

cliente.DeleteFile(Filename);

}

}

..

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Martin Dráb 239,040 Most Valuable Professional on at

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I'm not sure how your code is supposed to work. Anyway, it seems that you don't need anything more than to iterate the collection, therefore I would use the non-generic interface IEnumerable.

Please look at this code; just bear in mind it's been written without any compiler or anything.

System.Collections.IEnumerable list = cliente.ListDirectory("/outbound/", null); System.Collections.IEnumerator enumerator = list.GetEnumerator(); Renci.SshNet.Sftp.SftpFile sftpFile; str name; while (enumerator.MoveNext()) { sftpFile = enumerator.get_Current(); name = sftpFile.get_Name(); }

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Thanks a million, Martin :)

Problem solved.

Have a nice day!

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syed baber 11,633 on at

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I had the same issues and creating object of type IEnumerable solved the issue for me.

Thanks Martin for excellent answer.

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