How do I upload an .xlsx file to an FTP without creating a local file?

To upload an .xlsx file to an FTP server without creating a local file, you can use the WebRequest class in C#. Here's an example:

csharpCopy code
using System;

using System.IO;

using System.Net;



class Program

{

    static void Main()

    {

        string ftpServerUrl = "ftp://example.com";

        string username = "your-username";

        string password = "your-password";

        string remoteFilePath = "/path/to/remote/file.xlsx";



        // Read the .xlsx file data

        byte[] fileData = ReadExcelFileData("path/to/local/file.xlsx");



        // Create the FTP request

        FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(ftpServerUrl + remoteFilePath);

        ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;

        ftpRequest.Credentials = new NetworkCredential(username, password);



        // Upload the file data

        using (Stream requestStream = ftpRequest.GetRequestStream())

        {

            requestStream.Write(fileData, 0, fileData.Length);

            requestStream.Close();

        }



        // Get the FTP response

        FtpWebResponse ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();

        Console.WriteLine($"Upload Complete, status: {ftpResponse.StatusDescription}");



        ftpResponse.Close();

    }



    static byte[] ReadExcelFileData(string filePath)

    {

        using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))

        using (MemoryStream memoryStream = new MemoryStream())

        {

            fileStream.CopyTo(memoryStream);

            return memoryStream.ToArray();

        }

    }

}

In this example, we first read the .xlsx file data into a byte array using the ReadExcelFileData method. Then, we create an FtpWebRequest with the FTP server URL, username, and password. We set the request method to UploadFile and provide the network credentials.

Next, we open a request stream using GetRequestStream, write the file data to the stream, and close it. Finally, we get the FTP response to check the upload status.

Make sure to replace ftp://example.com with the FTP server URL, your-username and your-password with the FTP credentials, and /path/to/remote/file.xlsx with the desired remote file path on the FTP server. Also, replace "path/to/local/file.xlsx" with the path to your local .xlsx file.

Note that this example assumes the file is small enough to fit into memory. If you are dealing with large files, you may need to modify the code to read and upload the file in chunks.