Mono Profile Mac App


Pair to Mac will check to make sure that Mono is installed. If it is not installed, Pair to Mac will download and install the latest stable version of Mono on the Mac. Progress is indicated by various prompts, as shown by the following screenshots (click to zoom). Mac App Store is the simplest way to find and download apps for your Mac. To download apps from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Monosnap screenshot tool for Mac and PC with own cloud storage. Take screenshots, record videos and upload files directly to the cloud. Just in one click.

Visual Basic.NET support in Mono is relatively new. The Visual Basic runtime has been available for Mono for a while, and with the release of Mono 1.2.3, the Visual Basic support is complete, with the introduction of a self-hosting compiler and class libraries for Visual Basic development on any of the Mono supported systems. For more information, read Novell’s announcement on the Visual Basic compiler.

Having a native compiler for Visual Basic not only allows developers that wish to complete develop in a Mono supported platform, but also allows applications that depend on the CodeDOM (ASP.NET for example) to be developed using Visual Basic. Something that before the availability of the compiler was not possible.

A new Visual Basic.NET framework is under development, and it consists of two components: a new VB.NET compiler written in VB.NET (developed by Rolf Bjarne Kvinge) and a new VB.NET runtime developed completely in VB.NET under development at Mainsoft by Rafael Mizrahi and Boris Kirzner.

The new runtime is being developed in VB.NET and does no longer require the ILASM and Perl hacks that were required to implement the Visual Basic runtime as we did in the past. The new runtime also contains a large collection of regression tests to ensure that the quality of the runtime, something that we did not have in the past.

Vbnc is a CIL compiler for the Visual Basic.Net language, written in Visual Basic.Net. The compiler is targeting the 2.0 version of the CIL language, and due to the implementation of the reflecion api in .NET it is currently impossible to generate 1.0 assemblies.

Compiler Status

Mono Mac Os

The compiler is mostly feature-complete (compared to Visual Basic 8 (Visual Studio 2005)), with the following exceptions:

  • The support for Option Explicit Off is not implemented (no plans for this for the moment)
  • XML comments (no plans for this for the moment)


From Packages


Starting with Mono 1.2.3, packages of the Mono Visual Basic Compiler and Visual Basic Runtime are available at our Downloads page.

From Source Code

The code is currently available from git from the module mono-basic, alternatively a source code package is available from our Downloads page.

To install Mono Basic, use the usual:

Then you will be able to use vbnc as your command line compiler to build Visual Basic applications.

FAQ for the Visual Basic Framework

What is the role of the compiler in the development process?

A compiler is a computer program that translates text written in a computer language (the source language) into another computer language (the target language). The most common reason for wanting to translate source code is to create an executable program. By creating the Visual Basic compiler, the Mono Project has developed a program, written in Visual Basic itself, that can translate Visual Basic language into computer language that will allow the application to be executable across across multiple platforms, including Linux.

Why is this new VB compiler important?

This is a milestone step forward in the Mono project. There are a huge number of developers worldwide who write using Visual Basic and this VB compiler makes it possible for those developers to write applications that run on Linux without needing any specific Linux expertise. Also, developers can now do Visual Basic development *in* Linux as opposed to using Linux only as a deployment target.

What are the uses of a native Visual Basic.NET compiler on Unix?

It allows:

  • Developers to develop applications natively on Unix.
  • Developers can continue to use Visual Studio on Windows and run the resulting binaries on Linux, allowing them to move their development to Unix when needed.
  • The hosting of VB.NET-based ASP.NET applications on Unix.

For which version of Visual Basic will this compiler work and when is it available?

The new Visual Basic compiler is an implementation of Visual Basic.NET version 8, so it has support for new features in the language such as generics. The current Mono 2.6 release (available from our Downloads page) includes the Visual Basic 8 compiler written in Visual Basic 8, and Mainsoft’s Visual Basic runtime for 2.0. The compiler only targets the 2.0 framework API, while the runtime supports both 1.0 and 2.0 profiles.

If someone is using .NET 3.0, will this work?

.NET 3.0 is essentially a new set of libraries for .NET 2.0. We’re working on some of these pieces right now, but we have not released any of this yet. The first one will be WCF, then followed at some point by WPF. So right now, if you’re dependent on 3.0 APIs, you wont be able to port. But there are not many of these applications out there yet.

Is this part of the recent Novell-Microsoft agreement?

No. The Mono project is sponsored by Novell, but it is not part of the technical cooperation agreement announced between Novell and Microsoft in November 2006. Mono developers have been working on the compiler for some time. It is a significant technical achievement. Since it is open source, the technology is available for others to use.

Is the Visual Basic 8 compiler considered stable?

We consider the compiler right now to be feature complete. That doesn’t mean that it is bug free. Although there is enormous set of test suites that we run against it, people are still going to run into bugs, which they are encouraged to report at our Bugs page.

Will applications compiled using the VB compiler in Linux (or Mac) run on Windows?

Yes, they will require .NET 2.0 to be installed.

Do applications compiled under Linux require the VB runtime to run?

Mono offers this as an option. Either you install Mono’s Visual Basic runtime, or you can use a Mono process called “Bundling” that will generate a static executable with no external dependencies to run your binary.

Will there be a performance lag in compiling and running VB.NET apps on other platforms?

There are certain API calls that are Windows-specific which we have mapped to Linux, but the majority of applications do not depend strongly on Windows. The one bit that is not supported are COM components, since Linux has no equivalent to COM. If a Visual Basic application requires COM or ActiveX controls, those will not run.

For information about the old visual basic framework in Mono, see our Old Visual Basic page.

Mono Mac Download



Supported versions and requirementsApp Center supports Portable Class Library (PCL) and .NET Standard projects. Refer to Cloud Build Machines for versions of .NET Standard.App Center doesn't support Components from the Xamarin Component Store and we advise using NuGet packages whenever available. If you're using a Component that can't be replaced, contact us. See help and feedback.

To start building your first Xamarin iOS app, you'll need to:

  1. Connect to your repository service account (GitHub, Bitbucket, VSTS, Azure DevOps).
  2. Select a repository and a branch where your app lives.
  3. Configure the build's project or workspace, and the scheme you want to build.


For the app to run on a real device, the build needs to be code signed with a valid provisioning profile and a certificate.

1. Linking your repository

If you haven't previously connected to your repository service account, you must connect it. Once your account is connected, select the repository where your iOS project is located. To set up a build for a repository, you need admin and pull permission for it.

2. Selecting a branch

After selecting a repository, select the branch you want to build. By default all the active branches will be listed.

3. Setting up your first build

Before your first build, the Xamarin project needs to be configured.

3.1. Project/solution

App Center automatically detects the solution and project files in your repository if they're located within the range of analysis. Select the .sln or .csproj/.fsproj you want to build.


For best performance, the analysis is currently limited to two directory levels for .sln and four directory levels for .csproj/fsproj including the root of your repository.

3.1.1. Building from the solution file (.sln)

In your code, make sure to disable Android and UWP projects for build configs that are intended for iOS builds: go into the solution's configuration mappings, and for all mappings that target iPhone and iPhoneSimulator, uncheck all projects targeting other platforms. This change will ensure that when the .sln is building, it won't attempt to build the other projects. There's more solution configurations mapping information you can read.

3.1.2. Building from the project file (.csproj/.fsproj)

To build from a .csproj/.fsproj file all the referenced projects (for example, your PCL project) must contain the configuration with the same name as the one from your source iOS project. So, if you run the Debug configuration for the simulator in App Center, your PCL project must have the Debug iPhoneSimulator configuration. In case they don't exist and to prevent further errors we add such configurations before building your projects. Those configurations have basic default settings for Debug and Release only.

3.2. Configuration

Select the configuration you want to build with. The configurations are automatically detected depending on the source file picked in the previous step.

3.3. Mono version

App Center allows using different Mono environments bundled with respective Xamarin.iOS SDK for your build to maintain backward compatibility while releasing a support for new features. The default Mono for a new branch configuration will be the latest stable one. You may choose to use one of the previous Mono environments to build older versions of frameworks or libraries. When you choose a different Mono version, you'll see the Xamarin.iOS SDK version that's bundled with it. To track Xamarin SDK version updates, you can read posts in the Xamarin release blog.

3.3.1. .NET Core version

Proper .NET Core version will be selected automatically based on Mono version used for build and can't be overwritten. You can view the mapping of Mono to the .NET Core used by our services in the table below:

Mono.NET Core

3.4. Xcode Version

Currently supported versions of Xamarin require Xcode 9.4.1 or higher

3.5. Build triggers

By default, a new build is triggered every time a developer pushes to a configured branch. If you prefer to trigger a new build manually, you can change this setting in the configuration pane.

3.6. Simulator build

Simulator builds can only be ran on simulators and can't be installed on the device, however the builds complete faster than device builds. If your build isn't a simulator build, you need to upload code signing files in the next step.

3.7. Increment build number

When enabled, the CFBundleVersion in the Info.plist of your app automatically increments for each build. The change happens pre-build and won't be committed to your repository.

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3.8. Code signing

A successful device build will produce an IPA file. To install the build on a device, it needs to be signed with a valid provisioning profile and certificate. To sign the builds produced from a branch, enable code signing in the configuration pane and upload a provisioning profile (.mobileprovision) and a valid certificate (.p12), along with the password for the certificate. You can read more about code signing and device provisioning of Xamarin iOS apps in the Xamarin documentation.

Apps with app or watchOS extensions require an additional provisioning profile per extension to be signed.


There's an existing issue when running nuget restore in projects containing Xamarin watchOS apps.Building a watchOS app on App Center without a workaround will result in an error:

Project <project> is not compatible with xamarinios10 (Xamarin.iOS,Version=v1.0) / win-x86. Project <project> supports: xamarinwatchos10 (Xamarin.WatchOS,Version=v1.0).

To build watchOS apps on App Center, a workaround is required. Within the containing iOS project, which references to the Watch App, an additional line must be included:


Example WatchApp reference with workaround:

3.9. Launch your successful build on a real device

Use your newly produced .ipa file to test if your app starts on a real device. Launch testing adds about 10 more minutes to the build time. You may want to check more comprehensive guide about testing your builds

3.10. NuGet restore

If the NuGet.config file is checked-in for the repository and sitting next to the .sln or the root level of your repository, App Center restores your private NuGet feeds when they're added as shown in the example below. Credentials can be added safely by using environment variables:

If you have complex configurations and need more information, refer to Configuring NuGet behavior.

3.11. Distribute to a distribution group

You can configure each successful build from a branch to be distributed to a previously created distribution group. You can add a new distribution group from within the Distribute section. There's always a default distribution group called 'Collaborators' that includes all the users who have access to the app.

Once you save the configuration, a new build will be automatically kicked off.

4. Build results

After a build has been triggered, it can be in the following states:

  • queued - The build is in a queue waiting for resources to be freed up.
  • building - The build is running and executing the predefined tasks.
  • succeeded - The build completed successfully.
  • failed - The build stopped due to a failure. You can troubleshoot what went wrong by downloading and inspecting the build log.
  • canceled - The build was canceled by a user action or timed out.

4.1. Build logs

Mono Profile Mac Application

For a completed build (succeeded or failed), download the logs to understand more about how the build went. App Center provides an archive with the following files:

The build step-specific logs (located in the build/ directory of the archive) are helpful for troubleshooting and understanding in what step and why the build failed.

4.2. The app (.ipa or .app)

The .ipa is an iOS application archive file that contains the iOS app. If the build has been correctly signed, the .ipa can be installed on a real device, corresponding to the provisioning profile used when signing. There are more details about code signing and distribution with App Center.

If the app is a simulator build, you can run the .app file on a simulator, but you can't use it on a real device.

4.3. The symbol files (.dsym)

Install Mono Mac

Symbol files are only generated for device builds. The .dsym files contain the debug symbols for the app.

Mono Profile Mac App

  • If previously integrated the App Center SDK in your app with the crash reporting module enabled, the crash reporting service requires this .dsym file for a build to display human readable (symbolicated) crash reports.
  • If you previously integrated another SDK for crash reporting in your app (for example, HockeyApp SDK), the corresponding service requires the .dsym file to display human readable crash reports.