Category Archives: Mono Framework

Stable Release: Cycle 7 Service Release 1

We are publishing a Stable release of our second bugfix release on top of Cycle 7, called Service Release 1.

NOTE Regarding .NET Standard and NuGet Client – These builds introduce compatibility with the new .NET Standard 1.6.  This in particular allows developers to consume NuGet packages that have been built against the .NET Standard 1.6.

NOTE: Since Google’s newest Android N previews now only allow linking to NDK-provided native libraries, existing apps using e.g. Mono.Data.Sqlite.dll will crash when running on Android N. You will need to rebuild your apps with Xamarin C6SR4, or later, to ensure that this crash does not occur once the final system image for Android N is released.

NOTEVisual F# Tools 4.0 RTM must be installed in order for F# console project builds to work with Cycle 7 Xamarin Studio build noted below.

NOTE: You will need to have Microsoft Build Tools 2015 installed in order to use the iOS Designer in the beta channel, with the current Xamarin.VS build.

NOTE: The Cycle 7 version of Xamarin Studio on Windows requires both Microsoft Build Tools 2013 (or Visual Studio 2013) and Microsoft Build Tools 2015 (or Visual Studio 2015) to be installed.


Products Released 

  • Xamarin Studio 6.0.2.73
    • Release Notes
    • Forum Thread – Stable Release: Cycle 7 – Service Release 1
    • Issues Fixed:
      • 42051 – Fixed an error when editing control name in storyboard
      • 41862 – Android Designer should now correctly open in XS for certain projects
      • 41499 – Shortened time it takes for NuGet package searches to return results
      • 42743 – HttpClientHandler combo is not shown for Community license
      • 42795 – View >> Focus Document is not functioning
  • Xamarin.Android 6.1.2.21

Upcoming Release Dates

Beta – July 6th, 2016

Beta 2 – July 20th, 2016

Beta 3 – July 26th, 2016

Beta 4 – July 29th, 2016

Stable – This Release!

Beta Release: Cycle 7 Service Release 1 (update 3)

We are publishing a newer preview of our second bugfix release on top of Cycle 7, called Service Release 1. As this is a Beta build, there may be some known issues and the possibility of new issues being found during testing.

NOTE Regarding .NET Standard and NuGet Client – These builds introduce compatibility with the new .NET Standard 1.6.  This in particular allows developers to consume NuGet packages that have been built against the .NET Standard 1.6.

Please check out the product release notes to see all the fixes and known issues for this preview, and use the below forum threads to report and monitor issues that may occur, as well as find any potential workarounds that may exist.

NOTE: Since Google’s newest Android N previews now only allow linking to NDK-provided native libraries, existing apps using e.g. Mono.Data.Sqlite.dll will crash when running on Android N. You will need to rebuild your apps with Xamarin C6SR4, or later, to ensure that this crash does not occur once the final system image for Android N is released.

NOTEVisual F# Tools 4.0 RTM must be installed in order for F# console project builds to work with Cycle 7 Xamarin Studio build noted below.

NOTE: You will need to have Microsoft Build Tools 2015 installed in order to use the iOS Designer in the beta channel, with the current Xamarin.VS build.

NOTE: The Cycle 7 version of Xamarin Studio on Windows requires both Microsoft Build Tools 2013 (or Visual Studio 2013) and Microsoft Build Tools 2015 (or Visual Studio 2015) to be installed.


Products Released 

  • Xamarin Studio 6.0.2.73
    • Release Notes
    • Forum Thread – Beta Release: Cycle 7 – Service Release 1
    • Issues Fixed:
      • 42051 – Fixed an error when editing control name in storyboard
      • 41862 – Android Designer should now correctly open in XS for certain projects
      • 41499 – Shortened time it takes for NuGet package searches to return results
      • 42743 – HttpClientHandler combo is not shown for Community license
      • 42795 – View >> Focus Document is not functioning
  • Xamarin.Android 6.1.2.21

Upcoming Release Dates

Beta – July 6th, 2016

Beta 2 – July 20th, 2016

Beta 3 – July 26th, 2016

Beta 4 – This Release!

Stable – July 2016

Alpha Preview 3: Cycle 8

We are releasing a newer Alpha preview of our next major feature release, called Cycle 8. As this is an Alpha build, there are some known issues and the possibility of new issues being found during testing.

Please check out the product release notes to see all the fixes and known issues for this preview, and use the below forum threads to report and monitor issues that may occur, as well as find any potential workarounds that may exist.


Known Issues

  • [Xamarin Studio] 40422: The roslyn workspace can’t be queried while it’s loading.
  • [Xamarin.VS]42397: The Xamarin.Forms Previewer is disabled on VS for this release.
  • [Xamarin.VS]42435: Getting “ResolveUniversalTypeIdentifiers” task failed unexpectedly” error, on building ‘Spritekit Game’ or ‘Scenekit Game’ Mac App solution in VS
  • [Xamarin.VS] 41608:  Deleting a zip from AppData\Local\Xamarin\zips causes all subsequent builds to fail.
  • [Xamarin.VS]40767:  Collection View and Table View are rendered differently on the iOS designer and the actual simulator.
  • [Xamarin.VS] 42046User is not able to login in XVS.
  • [Xamarin.VS / Xamarin.Android]41607: No build output when downloading to zips for support package.
  • [Xamairn.iOS]42392: ‘clang: error: unable to execute command: Segmentation fault: 11’ when compiling ios project
  • [Xamarin.Android]42835Android projects which use Support packages are failing to build on Windows due issue extracting resources
  • [Xamarin.Android]42469:  Apps may crash on startup with the assertion “fixed_type_allocator_indexs[type]==slot’ not met”.
  • [Mono Runtime] 41644: Shutdown deadlock for mono 4.5.1/master with Xamarin Studio

Products Released


Upcoming Release Dates

Alpha – April 27th, 2016 (Evolve Conference)

Alpha 2 – July 13th, 2016

Alpha 3 – This Release!

Stable – Fall 2016

Beta Release: Cycle 7 Service Release 1 (update 2)

We are publishing a newer preview of our second bugfix release on top of Cycle 7, called Service Release 1. As this is a Beta build, there may be some known issues and the possibility of new issues being found during testing.

NOTE Regarding .NET Standard and NuGet Client – These builds introduce compatibility with the new .NET Standard 1.6.  This in particular allows developers to consume NuGet packages that have been built against the .NET Standard 1.6.

Please check out the product release notes to see all the fixes and known issues for this preview, and use the below forum threads to report and monitor issues that may occur, as well as find any potential workarounds that may exist.

NOTE: Since Google’s newest Android N previews now only allow linking to NDK-provided native libraries, existing apps using e.g. Mono.Data.Sqlite.dll will crash when running on Android N. You will need to rebuild your apps with Xamarin C6SR4, or later, to ensure that this crash does not occur once the final system image for Android N is released.

NOTEVisual F# Tools 4.0 RTM must be installed in order for F# console project builds to work with Cycle 7 Xamarin Studio build noted below.

NOTE: You will need to have Microsoft Build Tools 2015 installed in order to use the iOS Designer in the beta channel, with the current Xamarin.VS build.

NOTE: The Cycle 7 version of Xamarin Studio on Windows requires both Microsoft Build Tools 2013 (or Visual Studio 2013) and Microsoft Build Tools 2015 (or Visual Studio 2015) to be installed.


Known Issues

  • [Xamarin.Android / 42168] – Error thrown when attempting to deploy a test app from Visual Studio to Android.

Products Released 


Upcoming Release Dates

Beta – July 6th, 2016

Beta 2 – July 20th, 2016

Beta 3 – This Release!

Stable – July 2016

Preview: Android N Support Preview 3

We are releasing our third preview with support and bindings for Google’s Android N SDK. Be sure to visit the Android N page and read about all the new features N support provides. If you are looking to get started right away, make sure to check out the new Android N samples and join in on the forum discussions.

Please note that depending on which platform you are targeting, you will need to download certain products for this preview to work:

  • If you are using Visual Studio, you will only need to download the Xamarin.VS linked below.
  • If you are using Xamarin Studio on a Mac machine, you will need to download the Xamarin Studio, Xamarin Android, and Mono Framework linked below.
  • If you are using Xamarin Studio on a Windows machine, you will to download the Xamarin Studio, Xamarin.VS, and GTK Installer linked below.

While these builds do support the final API 24 SDK, these will not be the final builds from Xamarin for Android N. We have a few more changes on our end before we push final builds to Stable.

As with all our preview releases, this is not a product we officially support. If you encounter any issues, we recommend filing a bug in Bugzilla. You can also jump into the discussions on the forum thread posted below.


Known Issues 

  • [Xamarin.Studio / Xamarin.VS] – 42677The Xamarin.Android Designer does not support rendering of the new API level (N). The Designer works normally with all other API levels.

Products Released

  • Xamarin for Visual Studio 4.1.2.24 [Download]

Beta Release: Cycle 7 Service Release 1 (updated)

We are publishing a newer preview of our second bugfix release on top of Cycle 7, called Service Release 1. As this is a Beta build, there may be some known issues and the possibility of new issues being found during testing.

NOTE Regarding .NET Standard and NuGet Client – These builds introduce compatibility with the new .NET Standard 1.6.  This in particular allows developers to consume NuGet packages that have been built against the .NET Standard 1.6.

Please check out the product release notes to see all the fixes and known issues for this preview, and use the below forum threads to report and monitor issues that may occur, as well as find any potential workarounds that may exist.

NOTE: Since Google’s newest Android N previews now only allow linking to NDK-provided native libraries, existing apps using e.g. Mono.Data.Sqlite.dll will crash when running on Android N. You will need to rebuild your apps with Xamarin C6SR4, or later, to ensure that this crash does not occur once the final system image for Android N is released.

NOTEVisual F# Tools 4.0 RTM must be installed in order for F# console project builds to work with Cycle 7 Xamarin Studio build noted below.

NOTE: You will need to have Microsoft Build Tools 2015 installed in order to use the iOS Designer in the beta channel, with the current Xamarin.VS build.

NOTE: The Cycle 7 version of Xamarin Studio on Windows requires both Microsoft Build Tools 2013 (or Visual Studio 2013) and Microsoft Build Tools 2015 (or Visual Studio 2015) to be installed.


Known Issues

  • [Xamarin.Android / 42168] – Error thrown when attempting to deploy a test app from Visual Studio to Android.
  • [Xamarin.Mac] – Some Xamarin.Mac Unified Mobile applications may fail linking with errors related to System.Security.dll. This can be worked around by disabling linking or downgrading to SR0. This will be fix in a future update.

Products Released 


Upcoming Release Dates

Beta – July 6th, 2016

Beta 2 – This Release!

Stable – July 2016

Preview: iOS 10 / Xcode 8 / Sierra Support

We are releasing a set of preview builds with support for Xcode 8, iOS 10, watchOS3, tvOS 10, and MacOS Sierra. Be sure to check out the supporting documentation on all these products as well. 

NOTE – These builds have been tested against Xcode beta 2. It has compatibility with Xcode beta 3, however we are still testing against beta 3 to find any issues that may exist.

There is no target stable date final iOS 10 support at this time, as we have to wait until Apple finalizes and publishes their support before we can release ours. That being said, we will do additional preview releases between now and the final Apple release, so be sure to check back and see if newer versions become available in the coming months.

As with all our preview releases, this is not a product we officially support. If you encounter any issues, we recommend filing a bug in Bugzilla. You can also jump into the discussions on the forum thread posted below.


Known Issues 

  • [Xamarin.iOS/Xamarin.VS] 42647: The Designer is not supported for Visual Studio in this preview.
  • [Xamarin.iOS/Xamarin.VS] 42573: watchOS projects will not build in Visual Studio with debug device configuration
  • [Xamarin Studio] 42568: WatchInterface.storyboard fails to load.
  • [Xamarin.iOS]41329: You will need to  disable, then enable, the ‘Show app on apple watch’ option on iPhone to install WatchKit app on watch device.

Products Released

  • Xamarin for Visual Studio 99.0.0.2978 [Download]

Stable Release: Cycle 7

We are publishing the final builds for our next major feature release, called Cycle 7, to the Stable channel.

Please check out the product release notes to see all the fixes and known issues for this release, and use the below forum threads to report and monitor issues that may occur, as well as find any potential workarounds that may exist.

NOTE: Since Google’s newest Android N previews now only allow linking to NDK-provided native libraries, existing apps using e.g. Mono.Data.Sqlite.dll will crash when running on Android N. The functionality for this is supported in this release.

NOTE: Visual F# Tools 4.0 RTM must be installed in order for F# console project builds to work with Cycle 7 Xamarin Studio build noted below.

NOTE: The Cycle 7 version of Xamarin.VS requires Microsoft Build Tools 2015 (or Visual Studio 2015) to be installed. These tools can be downloaded from the Download tab of My.VisualStudio.com with a Visual Studio subscription or a Dev Essentials account.

NOTE: The Cycle 7 version of Xamarin Studio on Windows requires both Microsoft Build Tools 2013 (or Visual Studio 2013) and Microsoft Build Tools 2015 (or Visual Studio 2015) to be installed. These tools can be downloaded from the Download tab of My.VisualStudio.com with a Visual Studio subscription or a Dev Essentials account.


Known Issues

  • [Xamarin.VS]41836 – For iOS apps, breakpoints within async methods in PCL projects are not hit if the linker is enabled.
  • [Xamarin.VS/Xamarin.iOS] – Under certain conditions, downgrading from our Xamarin products in the Alpha channel to the Beta or Stable channel versions may result in the Xamarin.iOS plugin failing to load correctly.
    • Workaround – Delete the component cache  (steps here).
  • [Xamarin.VS & Xamarin.iOS] – When deploying WatchKit applications in Visual studio, the error “The file ‘bin\iPhoneSimulator\Debug\WatchKitApp1WatchKitApp.app\WatchKitApp1WatchKitApp’ does not exist” may appear.
  • [Xamarin.VS] – tvOS Applications built with the “Build ad-hoc IPA” checkbox enabled in “Debug/Release + Device” configuration will fail with the error “The ‘CopyFileToWindows’ task failed unexpectedly.”
  • [Xamarin Studio] –  41565 – “Could not load solution:” and “Load operation failed.” when attempting to open certain projects in Xamarin Studio 6.0.
    • Recommended fix – Open the problematic .csproj file in a text editor and remove the conflicting item from the <ProjectTypeGuids> element. For iOS extension projects, the most common fix is to remove the {FEACFBD2-3405-455C-9665-78FE426C6842}; item from the list.
  • [Xamarin.Android] – AOT+LLVM compiling is disabled in this release due to a crash discovered while trying to fix a compiler issue. It will be re-enabled in a future release.

Products Released 

  • GTK# 2.12.38

Previous Release Dates

Alpha – March 10th, 2016.

Alpha 2 – Mar 15th, 2016

Beta RC1 – Apr 27th, 2016

Beta RC2 – May 18th, 2016

Beta RC3 – May 24th, 2016

Stable – This Release!

Beta Release: Cycle 7 Release Candidate 3

Update (6/6) – Slightly newer builds have been pushed to the Beta channel in anticipation of our upcoming Stable release. Please see the newer version numbers noted below. 

We are publishing a new release candidate of our next major feature release, called Cycle 7. As this is a Beta build, there may be some known issues and the possibility of new issues being found during testing.

Please check out the product release notes to see all the fixes and known issues for this preview, and use the below forum threads to report and monitor issues that may occur, as well as find any potential workarounds that may exist.

NOTE: Since Google’s newest Android N previews now only allow linking to NDK-provided native libraries, existing apps using e.g. Mono.Data.Sqlite.dll will crash when running on Android N. The functionality to support this is supported in this release.

NOTE: Visual F# Tools 4.0 RTM must be installed in order for F# console project builds to work with Cycle 7 Xamarin Studio build noted below.

NOTE – You will need to have MS Build Tools 2015 installed in order to use the iOS Designer with the Xamarin.VS build published to the Beta channel.


Known Issues

  • [Xamarin Studio] – Dragging and dropping a folder from one project to another moves the files, but does not add them to the destination project.
  • [Xamarin Studio] – Breakpoints are not hitting in Xamarin.Mac C#/F# Unified Applications.
  • [Xamarin Studio] – You may be unable to run watchkit applications after selecting Appicon on the Apple Watch Notification Center.
  • [Mono Framework] – Mono 4.3 Cryptography.ProtectedData fails to decrypt data from Mono 4.2. As a result, NuGet packages will fail to restore with the error “Data unprotection failed” when a protected NuGet source is configured.
    • Workaround – In Xamarin Studio you will need to add back any NuGet package sources that use password authentication before re-attempting to restore the packages.
  • [Xamarin.VS & Xamarin.iOS] – When deploying WatchKit applications in Visual studio, the error “The file ‘bin\iPhoneSimulator\Debug\WatchKitApp1WatchKitApp.app\WatchKitApp1WatchKitApp’ does not exist” may appear.
  • [Xamarin.VS] – tvOS Applications built with the “Build ad-hoc IPA” checkbox enabled in “Debug/Release + Device” configuration will fail with the error “The ‘CopyFileToWindows’ task failed unexpectedly.”

Products Released 


Upcoming Release Dates

Alpha – March 10th, 2016.

Alpha 2 – Mar 15th, 2016

Beta RC1 – Apr 27th, 2016

Beta RC2 – May 18th, 2016

Beta RC3 – This Release!

Stable – April/May 2016

Preview: Android N Support Preview 2

We are releasing our second preview with support and bindings for Google’s Android N SDK. Be sure to visit the Android N page and read about all the new features N support provides. If you are looking to get started right away, make sure to check out the new Android N samples and join in on the forum discussions.

Please note that depending on which platform you are targeting, you will need to download certain products for this preview to work:

  • If you are using Visual Studio, you will only need to download the Xamarin.VS linked below.
  • If you are using Xamarin Studio on a Mac machine, you will need to download the Xamarin Studio, Xamarin Android, and Mono Framework linked below.
  • If you are using Xamarin Studio on a Windows machine, you will to download the Xamarin Studio, Xamarin.VS, and GTK Installer linked below.

There is no target stable date for N support at this time, as we have to wait until Google finalizes and publishes their support before we can release ours. That being said, we will do additional N preview releases between now and the final Google release, so be sure to check back and see if newer versions become available in the coming months.

As with all our preview releases, this is not a product we officially support. If you encounter any issues, we recommend filing a bug in Bugzilla. You can also jump into the discussions on the forum thread posted below.


Known Issues 

  • [Xamarin.Studio / Xamarin.VS] – The Xamarin.Android Designer does not support rendering of the new API level (N).
  • 31002 – [Xamarin.Studio / Xamarin.VS] – Users will have to manually make sure their minimum SDK version is set to v6.0 (23) or lower, instead of v6.0.99 (24), in order to deploy to N devices and emulators.
  • 40156 – [Xamarin Android] Projects which utilize Support.v7.AppCompat may no longer compile on Windows when using the preview build tools (24 rc2). This can be worked around by using the latest stable version of build tools instead (23.0.3).

Products Released

  • Xamarin for Visual Studio 4.1.0.509 [Download]