Copying files from FTP to Azure Blob Storage - azure

Question

I have created my FTP (ftp://xyz.in) with user id and credentials.
I have created an asp.net core API application that will copy files from FTP to Azure blob storage.
I have my API solution placed in C://Test2/Test2 folder.
Now below is my code :
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp:/xyz.in");
request.Method = WebRequestMethods.Ftp.UploadFile;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential("pqr#efg.com", "lmn");
// Copy the contents of the file to the request stream.
byte[] fileContents;
// Getting error in below line.
using (StreamReader sourceStream = new StreamReader("ftp://xyz.in/abc.txt"))
{
fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
}
request.ContentLength = fileContents.Length;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(fileContents, 0, fileContents.Length);
}
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
{
Console.WriteLine($"Upload File Complete, status {response.StatusDescription}");
}
But on line
using (StreamReader sourceStream = new StreamReader("ftp://xyz.in/abc.txt"))
I am getting error : System.IO.IOException: 'The filename, directory name, or volume label syntax is incorrect : 'C:\Test2\Test2\ftp:\xyz.in\abc.txt''
I am not able to understand from where does 'C:\Test2\Test2' string gets append to my FTP.
Test2 is a folder where my .Net Core application is placed.

Answer 1

StreamReader() doesn't take a URL/URI, it takes a file path on your local system: (read the doco):
https://learn.microsoft.com/en-us/dotnet/api/system.io.streamreader.-ctor?view=net-5.0
StreamReader is interpurting the string you've supplied as a filename ("ftp://xyz.in/abc.txt"), and it's looking for it in the current running folder "C:\Test2\Test2". If your string was "abc.txt", it would look for a file called "abc.txt" in the current folder, e.g. C:\Test2\Test2\abc.txt.
What you want is to get the file using WebClient or something similar:
WebClient request = new WebClient();
string url = "ftp://xyz.in/abc.txt";
request.Credentials = new NetworkCredential("username", "password");
try
{
byte[] fileContents = request.DownloadData(url);
// Do Something...
}