Gtk# vs GtkSharp

Gtk#

Gtk# is a Mono/.NET binding to the cross platform Gtk+ GUI toolkit and the foundation of most GUI apps built with Mono (by mono)

GUI

Source Code

mono-project.com

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GtkSharp

.NET wrapper for Gtk and other related libraries (by GtkSharp)

Gtk C#

Source Code

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Gtk#		GtkSharp
	Project
1	Mentions	11
417	Stars	853
0.0%	Growth	1.9%
0.0	Activity	6.3
about 1 year ago	Latest Commit	25 days ago
C#	Language	C#
GNU General Public License v3.0 or later	License	GNU General Public License v3.0 or later

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

Gtk#

Posts with mentions or reviews of Gtk#. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-12-12.

What language do you use for developing GTK-Applications?
2 projects | /r/GTK | 12 Dec 2021

mono/gtk-sharp is still stuck on 2.0 I think, but GtkSharp/GtkSharp uses 3.22 and up.

GtkSharp

Posts with mentions or reviews of GtkSharp. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-09-09.

Is it a recently-added new feature to select TreeView nodes by dragging?
1 project | /r/GTK | 16 Dec 2022

Thanks, but I still have a question. Is that "rubber band selection" on GtkTreeView a new feature that was added to GTK4? Because, I use GTK# (the C# library for GTK) which uses GTK 3.22. I created a simple GtkTreeView, but I cannot do rubber band selection, on the same Linux PC where I recorded that rubber band selection in the OP. I wonder if this is because it is GTK3, or because I had not added the code to enable rubber band selection.
.NET MAUI on Linux Makes Progress
2 projects | /r/dotnetMAUI | 9 Sep 2022

I noticed GtkSharp is on version 3.24, quite mature. I hope MS takes this seriously brings much needed Linux support, as all the dependency components are in place.
.NET 6 is now in Ubuntu 22.04
23 projects | news.ycombinator.com | 16 Aug 2022

There's also the more direct route by using say Gtk directly[1].
[1]: https://github.com/GtkSharp/GtkSharp
How quickly and efficiently do you believe Linux will get support for MAUI apps?
2 projects | /r/dotnet | 28 Jun 2022

Looks like a "blocker" is getting GtkSharp working with .Net6. Unclear from this GitHub issue when such support will be merged into the project's main branch.
Cross platform gui frameworks that aren't xaml-based?
14 projects | /r/dotnet | 29 Jan 2022
Writing a GUI app on Linux, for Linux
3 projects | /r/csharp | 27 Jan 2022

For .NET GUI development on Linux, my go-to choice would be GTK#. This is a managed wrapper on GTK+2 or 3. If you have experience on developing GUI application using C and GTK+, you can reuse most of the concepts (and even some of the Glade files) in GTK#.
F# for Linux People
3 projects | dev.to | 17 Jan 2022

Your only real choice for GUI development with F#/.NET on Linux is GTK#. (I've gotten feedback on Twitter that this statement may be a bit harsh, will update when I dive a bit deeper into other options).
Pinta 2.0
1 project | /r/linux | 6 Jan 2022

https://github.com/GtkSharp/GtkSharp is used rather than the mono gtk-sharp-3
What language do you use for developing GTK-Applications?
2 projects | /r/GTK | 12 Dec 2021

mono/gtk-sharp is still stuck on 2.0 I think, but GtkSharp/GtkSharp uses 3.22 and up.
WinForms Alternative
3 projects | /r/csharp | 9 Feb 2021

GTK https://github.com/GtkSharp/GtkSharp

What are some alternatives?

When comparing Gtk# and GtkSharp you can also consider the following projects:

Avalonia - Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology

Maui.Markup - The .NET MAUI Markup Community Toolkit is a community-created library that contains Fluent C# Extension Methods to easily create your User Interface in C#

Xamarin.Forms - Xamarin.Forms Official Home

metroframework-modern-ui - My humble attempt to bring the new Modern UI alias Metro UI of Windows 8 to .NET Windows Forms applications.

maui-linux - .NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.

Eto.Forms - Cross platform GUI framework for desktop and mobile applications in .NET

gir.core - A C# binding generator for GObject based libraries providing a C# friendly API surface

Modern UI for WPF - MUI - Modern UI for WPF

Uno Platform - Build Mobile, Desktop and WebAssembly apps with C# and XAML. Today. Open source and professionally supported.

UWP Community Toolkit - The Windows Community Toolkit is a collection of helpers, extensions, and custom controls. It simplifies and demonstrates common developer tasks building .NET apps with UWP and the Windows App SDK / WinUI 3 for Windows 10 and Windows 11. The toolkit is part of the .NET Foundation.

Avalonia.FuncUI - Develop cross-plattform GUI Applications using F# and Avalonia!