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// Copy the contents of the file to the request stream. StreamReader sourceStream = new StreamReader("testfile.txt"); byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd()); sourceStream.Close(); request.ContentLength = fileContents.Length; Stream requestStream = request.GetRequestStream(); requestStream.Write(fileContents, 0, fileContents.Length); requestStream.Close(); |
It uses StreamReader to read a string from a text file, then encode the string to bytes and upload.
This document’s title has a general title “Upload Files with FTP". However, this approach with StreamReader only works with text file. If the above code is used to upload a binary file, like a picture, the uploaded file on FTP server becomes corrupted. The general options are:
1. Call File.ReadAllBytes to read the bytes, and write to request stream:
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byte[] fileContents = File.ReadAllBytes(filePath); using (Stream requestStream = request.GetRequestStream()) { requestStream.Write(fileContents, 0, fileContents.Length); } |
2. Use FileStream to read the file, and copy the file stream to request stream:
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public static async Task<FtpStatusCode> FtpUploadAsync(string uri, string userName, string password, string filePath) { FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri); request.Method = WebRequestMethods.Ftp.UploadFile; request.Credentials = new NetworkCredential(userName, password); // request.UsePassive is true by default. using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read)) using (Stream requestStream = request.GetRequestStream()) { await fileStream.CopyToAsync(requestStream); } using (FtpWebResponse response = (FtpWebResponse)await request.GetResponseAsync()) { return response.StatusCode; } } |
3. Use WebClient, which wraps all the above work flow:
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public static async Task FtpUploadAsync(string uri, string userName, string password, string filePath) { using (WebClient webClient = new WebClient()) { webClient.Credentials = new NetworkCredential(userName, password); await webClient.UploadFileTaskAsync(uri, WebRequestMethods.Ftp.UploadFile, filePath); } } |
