This post is contains sample on how to upload an image with FTPS in ASP.NET Core. It also contains a cheat sheet of all the properties and methods of an instance of an FtpWebRequest object, mostly as a quick reference guide.

The sample!

I know it is usually the other way around, but I kind of feel this is the most important part of this post! If you want to learn more about all the properties and methods of an instance of FtpWebRequest, keep scrolling!

public class SampleFTP {
    
    //...
    
    public async Task Upload(IFormFile file)
    {
        //Create an FtpWebRequest
        var request = (FtpWebRequest)WebRequest.Create("ftp://your_ftp_server/and_path/" + file.FileName);
        //Set the method to UploadFile
        request.Method = WebRequestMethods.Ftp.UploadFile;
        //Set the NetworkCredentials
        request.Credentials = new NetworkCredential("your_username", "your_password");

        //Set buffer length to any value you find appropriate for your use case
        byte[] buffer = new byte[1024];
        var stream = file.OpenReadStream();
        byte[] fileContents;
        //Copy everything to the 'fileContents' byte array
        using (var ms = new MemoryStream())
        {
            int read;
            while ((read = stream.Read(buffer, 0, buffer.Length)) > 0)
            {
                ms.Write(buffer, 0, read);
            }
            fileContents = ms.ToArray();
        }

        //Upload the 'fileContents' byte array 
        using (Stream requestStream = request.GetRequestStream())
        {
            requestStream.Write(fileContents, 0, fileContents.Length);
        }
        
        //Get the response
        // Some proper handling is needed
        var response = (FtpWebResponse) request.GetResponse();
        return response.StatusCode == FtpStatusCode.FileActionOK;
    }
    
    //...
}

Properties of an instance of an FtpWebRequest object.

The following is a table containing all properties of an instance of an FtpWebRequest object. In bold you will find the ones mostly used and in italics the properties not supported.

Methods of an instance of an FtpWebRequest object.

Same as before, the most common methods can be found with bold and in the top!