How to upload a file with progress tracking in FluentFTP?

Use the UploadFile or UploadFileAsync methods with a progress callback parameter. The library provides built-in support for tracking transfer progress, and examples are available in the File Transfer wiki for implementing real-time updates.

Does FluentFTP support SFTP?

No, FluentFTP does not support SFTP as it's a different protocol (FTP over SSH). For SFTP, you need to use a separate library like SSH.NET, as mentioned in the README under FTP protocol features.

FluentFTP vs System.Net.FtpClient, which is better?

FluentFTP offers more features, better server compatibility, and active maintenance compared to System.Net.FtpClient, which is older and less feature-rich. However, System.Net.FtpClient might be sufficient for very basic FTP tasks in .NET Framework.

How to handle automatic reconnection for broken FTP connections?

Enable the AutomaticReconnection property and configure retry settings. FluentFTP includes built-in logic to detect and reconnect degraded sockets, with details provided in the Automatic Reconnection wiki page.

Setting up FluentFTP for IBM z/OS server?

FluentFTP has specialized support for IBM z/OS, including handling realms and directory navigation. Refer to the IBM z/OS and OS/400 Support wiki for specific API usage and configuration examples.

Best practices for error handling in multi-file transfers?

Use the configurable error handling options (ignore, abort, throw) available in methods like UploadDirectory. The library allows setting behaviors per transfer, and examples are in the Rules and Directory Transfer wiki sections.

How to sync directories between local and FTP server?

Use the Mirror or Update modes in methods like UploadDirectory or DownloadDirectory. These synchronization modes are detailed in the Directory Transfer wiki, offering options for incremental or full backups.

Open-Awesome

FluentFTP

MITC#20.0.0

A fully managed, high-performance FTP and FTPS client library for .NET and .NET Standard, optimized for speed.

GitHub

3.4k stars679 forks0 contributors

What is FluentFTP?

FluentFTP is a fully managed FTP and FTPS client library for .NET and .NET Standard, optimized for speed and reliability. It provides extensive FTP commands, secure SSL/TLS connections, automatic server detection, and advanced file management features like uploads/downloads with progress tracking, directory synchronization, and hash verification. It solves the problem of implementing robust, cross-platform FTP functionality in .NET applications without external dependencies.

Target Audience

.NET developers who need to integrate FTP or FTPS file transfer capabilities into their applications, especially those working with enterprise systems, legacy servers, or requiring high compatibility across diverse FTP server types.

Value Proposition

Developers choose FluentFTP for its comprehensive feature set, exceptional server compatibility (over 30 server types), built-in security protections, and performance optimizations. Its fully managed, dependency-free design and permissive MIT license make it a reliable and flexible choice for both proprietary and open-source projects.

Overview

An FTP and FTPS client for .NET & .NET Standard, optimized for speed. Provides extensive FTP commands, File uploads/downloads, SSL/TLS connections, Automatic directory listing parsing, File hashing/checksums, File permissions/CHMOD, FTP proxies, FXP support, UTF-8 support, Async/await support, Powershell support and more. Written entirely in C#.

Use Cases

Best For

Building .NET applications that require secure FTP or FTPS file transfers
Integrating with legacy or enterprise FTP servers like IBM z/OS, Windows IIS, or ProFTPD
Implementing server-to-server file transfers using the FXP protocol
Automating file synchronization between local directories and FTP servers
Adding FTP monitoring capabilities to trigger events on file changes
Developing PowerShell scripts that interact with FTP servers

Not Ideal For

Applications requiring SFTP (SSH File Transfer Protocol) support
Projects with only basic FTP needs where a simpler, lighter library would suffice
Teams preferring a GUI-based FTP client over a programming library
Environments mandating real-time, streaming file transfers without discrete upload/download operations

Pros & Cons

Pros

Extensive Server Compatibility

Automatically detects and supports over 30 FTP server types, including niche systems like IBM z/OS and Windows CE, with tailored parsing for each as documented in the Server Support table.

Advanced File Management

Offers features like directory synchronization, hash verification, rule-based transfers, and progress tracking, enabling robust automation for file operations as highlighted in the File Management section.

Robust Security Features

Implements protections against FTP command injection, directory traversal attacks, and supports FTPS with TLS 1.3 and client certificates, prioritizing secure connections per the Security system wiki.

Full Async Support

Provides async/await for all operations with cancellation tokens and IAsyncEnumerable for listings, ensuring modern .NET performance and responsiveness as detailed in the Asynchronous support section.

Dependency-Free Design

Written entirely in C# with no external dependencies, making it easy to integrate into any .NET project without bloating dependencies, as stated in the Philosophy.

Cons

No SFTP Support

Explicitly does not support SFTP (FTP over SSH), requiring developers to use separate libraries like SSH.NET for SSH-based transfers, which is a notable gap for modern secure file transfer needs.

Complex API Surface

With extensive features covering protocols, server types, and advanced operations, the API can be overwhelming for simple tasks, potentially increasing the learning curve compared to more minimal FTP clients.

Documentation Fragmentation

Critical information is spread across a wiki and multiple example files, which might require more effort to navigate and find specific implementation details quickly.

Setup Overhead for Custom Servers

While extensible, configuring support for non-standard servers or adding custom parsers involves additional coding effort, as indicated in the Extensible section, which may not be ideal for quick deployments.

Frequently Asked Questions

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