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class=mb-1 fill=currentColor class="bi bi-house-fill" viewBox="0 0 16 16"><path fill-rule=evenodd d="m8 3.293 6 6V13.5a1.5 1.5 0 0 1-1.5 1.5h-9A1.5 1.5 0 0 1 2 13.5V9.293l6-6zm5-.793V6l-2-2V2.5a.5.5 0 0 1 .5-.5h1a.5.5 0 0 1 .5.5z"></path><path fill-rule=evenodd d="M7.293 1.5a1 1 0 0 1 1.414 0l6.647 6.646a.5.5 0 0 1-.708.708L8 2.207 1.354 8.854a.5.5 0 1 1-.708-.708L7.293 1.5z"></path></svg> Go Home </a> </div> </div> <div class=row> <div class="col mt-3"> <h1 class="text-center display-6">Code Snippet: How to upload an image with FTPS in ASP.NET Core</h1> </div> </div> <div class=row> <div class="col pb-2"> <div class="text-black-50 text-center"> <small>by <a href="https://georgekosmidis.net/" rel=noopener>George Kosmidis</a> / Published 5 years ago</small> </div> </div> </div> <div class=row> <div class="col text-center"> <img src=/media/100380-feature.png alt="Code Snippet: How to upload an image with FTPS in ASP.NET Core"> </div> </div> <div class=row> <div class="col pt-3 pb-6"> <p>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 <code>FtpWebRequest</code> object, mostly as a quick reference guide.</p> <p></p> <h2>The sample!</h2> <p>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 <code>FtpWebRequest</code>, keep scrolling!<br> <pre><code class=language-csharp>public class SampleFTP {
//...
public async Task<bool> 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;
}
//...
}</bool></code></pre> </p> <h2>Properties of an instance of an <code>FtpWebRequest</code> object.</h2> <p>The following is a table containing all properties of an instance of an <code>FtpWebRequest</code> object. In bold you will find the ones mostly used and in italics the properties not supported.</p> <div style=width:100%;margin:0;overflow-x:scroll> <table class=table><thead><tr><th>Property</th><th>Short explanation</th></tr></thead><tbody><tr><td style=white-space:nowrap><code><strong>string Method { get; set; }</strong></code></td><td> Gets or sets the command to send to the FTP server.<br> (e.g. <code>request.Method = WebRequestMethods.Ftp.UploadFile;</code>)<br> <em>Check the container class of the <a href=https://github.com/microsoft/referencesource/blob/a7bd3242bd7732dec4aebb21fbc0f6de61c2545e/System/net/System/Net/WebRequestMethods.cs#L4 rel="noopener noreferrer" target=_blank>System.Net.WebRequestMethods.Ftp</a> class for available commands.</em> </td></tr><tr><td style=white-space:nowrap><code><strong>ICredentials Credentials { get; set; }</strong></code></td><td> Set the credentials used to communicate with the FTP server.<br> (e.g. <code>request.Credentials = new NetworkCredential(username, password);</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>bool KeepAlive { get; set; }</strong></code></td><td> Keep the connection alive after the request completes. Default is true.<br> (e.g. <code>request.KeepAlive = true;</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>bool UsePassive { get; set; }</strong></code></td><td> Client should initiate a connection on the data port. Default is true.<br> (e.g. <code>request.UsePassive = true;</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>bool EnableSsl { get; set; }</strong></code></td><td> Set control and data transmissions to be encrypted. Default is true.<br> (e.g. <code>request.EnableSsl= true;</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>bool UseBinary</strong></code></td><td> Indicate to the server that the data to be transferred is binary. Default is true.<br> (e.g. <code>request.UseBinary = true;</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>int Timeout { get; set; }</strong></code></td><td> Set the number of milliseconds to wait for a request.<br> (e.g. <code>request.Timeout = 5000;</code>) </td></tr><tr><td style=white-space:nowrap><code>string RenameTo { get; set; }</code></td><td> Set the new name of a file being renamed.<br> (e.g. <code>request.RenameTo = "new_name";</code>) </td></tr><tr><td style=white-space:nowrap><code>AuthenticationLevel AuthenticationLevel { get; set; }</code></td><td> Indicate the level of authentication and impersonation used for this request.<br> (e.g. <code>request.AuthenticationLevel = System.Net.Security.AuthenticationLevel.MutualAuthRequested;</code>) </td></tr><tr><td><code>X509CertificateCollection ClientCertificates { get; set; }</code></td><td> Set the certificates used for establishing an encrypted connection to the FTP server.<br> (e.g. <code>request.ClientCertificates = new System.Security.Cryptography.X509Certificates.X509CertificateCollection();</code>) </td></tr><tr><td style=white-space:nowrap><code>string ConnectionGroupName { get; set; }</code></td><td> Set the name of the connection group that contains the service point used to send the current request.<br> (e.g. <code>request.ConnectionGroupName = "The .NET Lab";</code>) </td></tr><tr><td style=white-space:nowrap><code>long ContentOffset { get; set; }</code></td><td> Byte offset into the file being <em>downloaded</em> by this request.<br> (e.g. <code>request.ContentOffset = 512;</code>) </td></tr><tr><td style=white-space:nowrap><code>IWebProxy Proxy { get; set; }</code></td><td> Set the proxy used to communicate with the FTP server.<br> (e.g. <code>request.Proxy = new WebProxy();</code>) </td></tr><tr><td style=white-space:nowrap><code>int ReadWriteTimeout { get; set; }</code></td><td> Set a time-out when reading from or writing to a stream.<br> (e.g. <code>request.ReadWriteTimeout = 30;</code>) </td></tr><tr><td style=white-space:nowrap><code>Uri RequestUri { get; }</code></td><td> Get the URI requested by this instance.<br> (e.g. <code>var uri = request.RequestUri;</code>) </td></tr><tr><td style=white-space:nowrap><code>ServicePoint ServicePoint { get; }</code></td><td> Get the <code>System.Net.ServicePoint</code> object used to connect to the FTP server.<br> (e.g. <code>var servicepoint = request.ServicePoint;</code>) </td></tr><tr><td style=white-space:nowrap><code><em>WebHeaderCollection Headers { get; set; }</em></code></td><td> It’s always empty! </td></tr><tr><td style=white-space:nowrap><code><em>bool PreAuthenticate { get; set; }</em></code></td><td> Not supported! </td></tr><tr><td style=white-space:nowrap><code><em>string ContentType { get; set; }</em></code></td><td> Not supported! </td></tr><tr><td style=white-space:nowrap><code><em>long ContentLength { get; set; }</em></code></td><td> Value is ignored, don’t use it! </td></tr><tr><td style=white-space:nowrap><code><em>bool UseDefaultCredentials { get; set; }</em></code></td><td> Not supported! </td></tr></tbody></table> </div> <h2>Methods of an instance of an <code>FtpWebRequest</code> object.</h2> <p>Same as before, the most common methods can be found with bold and in the top!</p> <div style=width:100%;margin:0;overflow-x:scroll> <table class=table><thead><tr><th>Property</th><th>Short explanation</th></tr></thead><tbody><tr><td style=white-space:nowrap><code><strong>.Create()</strong></code></td><td> Initialize a new <code>System.Net.WebRequest</code> instance for the specified URI scheme.<br> (e.g. <code>var request = (FtpWebRequest)WebRequest.Create(host + "/" + path + "/" + filename);</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>WebResponse GetResponse();</strong></code></td><td> Retrieve the stream used to upload data to an FTP server.<br> (e.g. <code>WebResponse response = request.GetResponse();</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>Task<WebResponse> GetResponseAsync();</strong></code></td><td> Retrieve the stream used to upload data to an FTP server asynchronously.<br> (e.g. <code>var response = await request.GetResponse();</code>) </td></tr><tr><td style=white-space:nowrap><code><strong>void Abort();</strong></code></td><td> Terminate an asynchronous FTP operation.<br> (e.g. <code>request.Abort();</code>) </td></tr><tr><td><code>IAsyncResult BeginGetRequestStream(AsyncCallback callback, object state);</code></td><td> Begin asynchronously opening a request’s content stream for writing.<br> (e.g. <code>request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);</code>)<br> <em>Check the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.begingetrequeststream?view=netcore-3.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Microsoft Docs</a> for more info.</em> </td></tr><tr><td><code>Stream EndGetRequestStream(IAsyncResult asyncResult);</code></td><td> Begin asynchronously opening a request’s content stream for writing.<br> (e.g. <code> Stream postStream = request.EndGetRequestStream(asynchronousResult);</code>)<br> <em>Check the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.endgetrequeststream?view=netcore-3.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Microsoft Docs</a> for more info.</em> </td></tr><tr><td><code>IAsyncResult BeginGetResponse(AsyncCallback callback, object state)</code></td><td> Begin sending a request and receiving a response from an FTP server asynchronously.<br> (e.g. <code>IAsyncResult result=<br> (IAsyncResult) myHttpWebRequest.BeginGetResponse(new AsyncCallback(RespCallback),myRequestState);</code>)<br> <em>Check the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.begingetresponse?view=netcore-3.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Microsoft Docs</a> for more info.</em> </td></tr><tr><td><code>WebResponse EndGetResponse(IAsyncResult asyncResult)</code></td><td> Ends a pending asynchronous operation started with <code>BeginGetResponse(System.AsyncCallback,System.Object)</code>.<br> (e.g. <code> myRequestState.response = (HttpWebResponse) myHttpWebRequest2.EndGetResponse(asynchronousResult);</code>)<br> <em>Check the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.endgetresponse?view=netcore-3.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Microsoft Docs</a> for more info.</em> </td></tr><tr><td><code>Stream GetRequestStream();</code></td><td> Retrieve the stream used to upload data to an FTP server.<br> (e.g. <code> var stream = request.GetRequestStream();</code>)<br> <em>Check the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.getrequeststream?view=netcore-3.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Microsoft Docs</a> for more info.</em> </td></tr><tr><td><code>Task<Stream> GetRequestStreamAsync();</code></td><td> Retrieve the stream used to upload data to an FTP server asynchronously.<br> (e.g. <code>var stream = await request.GetRequestStreamAsync();</code>) </td></tr><tr><td><code>object InitializeLifetimeService();</code></td><td> Obtain a lifetime service object to control the lifetime policy for this instance.<br> (e.g. <code>var service = request.InitializeLifetimeService();</code>) </td></tr><tr><td><code>object GetLifetimeService();</code></td><td> Retrieve the current lifetime service object that controls the lifetime policy for this instance.<br> (e.g. <code>var service = request.GetLifetimeService();</code>) </td></tr></tbody></table> </div> </div> </div> <div class="row border-end border-start border-top bg-light mt-4"> <div class="col pt-2" style=text-align:center> This page is <strong>open source</strong>. 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