@ChrisHamons, Thanks for your help.The issue is that code mentioned in that post is running in Xamarin Studio 5.9 but not in 6.x. Can you try the code in C# console application. Sudo apt-get remove mono-complete # Edit your mono-xamarin.list and pin it to the version of your choice. Sudo apt-get update sudo apt-get install mono-complete Accessing older releases If for some reason you want to pin an older version of Mono rather than updating to the latest, you can modify the Debian repository to “wheezy/snapshots/X.XX. Sponsored by Microsoft, Mono is an open source implementation of Microsoft's.NET Framework based on the ECMA standards for C# and the Common Language Runtime.A growing family of solutions and an active and enthusiastic contributing community is helping position Mono to become the leading choice for development of cross platform applications. 24,948 downloads Updated: September 17, 2020 MIT License. Review Free Download changelog 100% FREE report malware. A free and open source implementation of Microsoft's NET Framework that complies to the ECMA standards for the C# and the Common Language Runtime.
Introduction to Mono on macOS
Mono supports macOS version 10.9 (Mavericks) and later.
You can use Mono on macOS to build server, console and GUI applications. Read below for the options available for GUI application development.
If you are interested in creating native GUI applications, use the MonoMac bindings and our MonoDevelop add-in. Read the description on MonoMac for more information on how to get started.
Installing Mono on macOS
You can use Mono either as a runtime to run existing application, or as an SDK to develop new applications with Mono.
Visit the download page to find the latest macOS package. Run it and follow the instructions there, you can either get a basic runtime, or a complete runtime plus a software development kit.
If you plan on developing applications with Mono, we suggest that you also install the MonoDevelop IDE after you install Mono.
The Mono package includes:
- The Mono Runtime
- GUI Toolkits: Windows.Forms and Gtk# for macOS.
- Note: the MonoMac GUI toolkit for native macOS GUI development is currently a separate download.
- SDK: C#, Visual Basic compilers, assemblers and tools
- XSP ASP.NET server
- Manual pages.
This package installs as a framework into /Library/Frameworks/Mono.framework (the same way the Java packages are installed). The executable binaries can be found in /Library/Frameworks/Mono.framework/Versions/Current/bin. If you’d like to access the mono manpages you’ll have to add /Library/Frameworks/Mono.framework/Versions/Current/man to your manpath. The macOS Mono package does not include Gtk#, XSP or mod_mono. These will have to be compiled from source.
Our packages currently require macOS 10.9 or better, for older versions, you will need to build from source code.
Using Mono on macOS
At this point, you must use Mono from the command line, the usual set of commands that are available on other ports of Mono are available.
To build applications you can use “mcs”, to run then you can use mono.
From a Terminal shell, you can try it out:
Most users would be using the MonoDevelop IDE to create their projects.
You will have a choice of GUI toolkits for building your application, from pure cross platform, to Mac-specific using MonoMac.
32 and 64 bit support
The Mono packages published on this web site provide both a 32-bit and a 64-bit Mono VM.
Starting from Mono 5.2 the mono command defaults to 64-bit, you can use the --arch=32/64 switch to control the bitness.
The 64 bit support has a few limitations today:
- Our Windows.Forms implementation uses Carbon, and as such, it would not work with a 64-bit Mono.
Building Client Applications
There are a few choices to build client applications on macOS, you should pick the technology that better fits your goals, your choices are:
| Toolkit | Runs on Linux | Runs on Windows | Runs on Mac | Binding Style | License | Status |
| MonoMac | no | no | yes | Strongly typed C# binding to Cocoa APIs | MIT X11 | Actively developed, builds on the design lessons from MonoTouch but still incomplete. This will be the new default binding for Mono on macOS. Separate download. |
| Gtk# | yes | yes | yes | Strongly typed C# binding to the cross platform Gtk+ API. Applications look foreign on macOS. | LGPL v2 | Actively developed, cross platform. Bundled with Mono. |
| Windows.Forms | yes | yes | yes | Cross platform implementation of Microsoft’s Windows.Forms. Applications look foreign on macOS. | MIT X11 | The Windows.Forms API was frozen in time by Microsoft. Bundled with Mono. |
| MonObjc | no | no | yes | Binding to the native Cocoa APIs, but requires manual use of Objective-C selectors to work with, relatively thin wrapper around the underlying APIs. | LGPL v3 | Actively developed. Separate download. |
| CocoaSharp | no | no | yes | Binding to the native Cocoa APIs, but requires manual use of Objective-C selectors to work with, relatively thin wrapper around the underlying APIs. | MIT X11 | No longer developed, no longer maintained, deprecated. Bundled with Mono. |
Running Mono applications on macOS
Running applications on macOS is very similar to linux systems, from the terminal:
For GTK# applications, it’s easiest to run them the same way but using xterm from X11.app
Windows.Forms
Mono’s implementation of the System.Windows.Forms API is built on top of Carbon and can only run with Mono on 32 bit systems. The look and feel of System.Windows.Forms applications mimics the Windows style and does not currently render like a native macOS application.
Third Party Libraries
ObjC# is a transparent two way bridge that allows the CLR to access the rich underlying ObjectiveC frameworks as well as providing direct access to the CLR frameworks from the ObjectiveC language.
Uninstalling Mono on macOS
Run this script in a terminal:
Mono for macOS is available as a Mac Package (.pkg)
Please refer to the installation guide for more information about how to install and configure your Mono environment.
Supported on macOS 10.9 and later. Check the uninstall instructions if you want to remove Mono from your Mac.
- Ubuntu
- Debian
- Raspbian
- CentOS/RHEL
- Fedora
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands.
Note: the packages should work on newer Ubuntu versions too but we only test the ones listed below.
Ubuntu 20.04 (amd64, armhf, arm64, ppc64el)
Ubuntu 18.04 (i386, amd64, armhf, arm64, ppc64el)
Ubuntu 16.04 (i386, amd64, armhf, arm64, ppc64el)
2 Install Mono
The package mono-devel should be installed to compile code.
The package mono-llvm-support should be installed for LLVM JIT/AOT support. See here for more about LLVM Mono.
The package mono-complete should be installed to install everything - this should cover most cases of 'assembly not found' errors.
The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of 'Framework not installed: .NETPortable' errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The package mono-xsp4 should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Notes
Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots --import --sync). Some systems are configured in a way so that the necessary package isn't pulled in when Mono is installed, in those cases make sure the ca-certificates-mono package is installed.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands.
Note: the packages should work on newer Debian versions too but we only test the ones listed below.
Debian 10 (i386, amd64, armhf, arm64, armel, ppc64el)
Debian 9 (i386, amd64, armhf, arm64, armel, ppc64el)
2 Install Mono
The package mono-devel should be installed to compile code.
The package mono-llvm-support should be installed for LLVM JIT/AOT support. See here for more about LLVM Mono.
The package mono-complete should be installed to install everything - this should cover most cases of 'assembly not found' errors.
The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of 'Framework not installed: .NETPortable' errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The package mono-xsp4 should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Notes
Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots --import --sync). Some systems are configured in a way so that the necessary package isn't pulled in when Mono is installed, in those cases make sure the ca-certificates-mono package is installed.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands.
Note: the packages should work on newer Raspbian versions too but we only test the ones listed below.
Raspbian 10 (armhf)
Raspbian 9 (armhf)
2 Install Mono
The package mono-devel should be installed to compile code.
The package mono-llvm-support should be installed for LLVM JIT/AOT support. See here for more about LLVM Mono.
The package mono-complete should be installed to install everything - this should cover most cases of 'assembly not found' errors.
The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of 'Framework not installed: .NETPortable' errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The package mono-xsp4 should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Notes
Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots --import --sync). Some systems are configured in a way so that the necessary package isn't pulled in when Mono is installed, in those cases make sure the ca-certificates-mono package is installed.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands in a root shell.
Note: the packages should work on newer CentOS/RHEL versions too but we only test the ones listed below.
Mono Framework Mac Uninstall
CentOS/RHEL 8 (x86_64)
CentOS/RHEL 7 (x86_64)
CentOS/RHEL 6 (x86_64, i686)
2 Install Mono
Xamarin Mono
The package mono-devel should be installed to compile code.
The package mono-complete should be installed to install everything - this should cover most cases of 'assembly not found' errors.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of 'Framework not installed: .NETPortable' errors during software compilation.
The package xsp should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands in a root shell.
Note: we're using the CentOS/RHEL repositories on Fedora.
Fedora 29 (x86_64)
Fedora 28 (x86_64)
2 Install Mono
The package mono-devel should be installed to compile code.
The package mono-complete should be installed to install everything - this should cover most cases of 'assembly not found' errors.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of 'Framework not installed: .NETPortable' errors during software compilation.
The package xsp should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Mono for Windows is available as a Windows Installer file
Please refer to the installation guide for more information about how to install and configure your Mono environment.
Supported on Windows 7, 8, 10 or later.
Mono Mdk
GTK# for .NET
Mono Framework For Mac
Installer for running Gtk#-based applications on Microsoft .NET: