https://github.com/thecodetraveler/invokeonmainthreadasync_repro

Reproduction sample for Xamarin.Forms.InvokeOnMainThreadAsync
https://github.com/thecodetraveler/invokeonmainthreadasync_repro

Last synced: 7 months ago
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Reproduction sample for Xamarin.Forms.InvokeOnMainThreadAsync

• Host: GitHub
• URL: https://github.com/thecodetraveler/invokeonmainthreadasync_repro
• Owner: TheCodeTraveler
• Created: 2019-06-28T20:51:25.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-07-16T17:06:40.000Z (over 6 years ago)
• Last Synced: 2025-02-14T05:31:21.745Z (about 1 year ago)
• Language: C#
• Size: 314 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# InvokeOnMainThreadAsync_Repro

Reproduction sample for Xamarin.Forms.InvokeOnMainThreadAsync

**Update**

[This issue](https://github.com/xamarin/Xamarin.Forms/issues/6705) has been fixed in Xamarin.Forms v4.2.0.608146-pre1.

## Reproduction Steps, iOS

1. Open `InvokeOnMainThreadAsync_Repro.sln` in Visual Studio or Visual Studio for Mac

2. Build/Deploy `InvokeOnMainThreadAsync_Repro.iOS` to an iOS Device or Simulator

3. Tap the Button titled `No Crash`

4. Confirm the animation completes successfully

5. Tap the Button titled `Crash1`

6. Confirm the app crashes with `NullReferenceException`

7. Build/Deploy `InvokeOnMainThreadAsync_Repro.iOS` to an iOS Device or Simulator

8. Tap the Button titled `Crash2`

9. Confirm the app crashes with `NullReferenceException`

## Reproduction Steps, Android

1. Open `InvokeOnMainThreadAsync_Repro.sln` in Visual Studio or Visual Studio for Mac

2. Build/Deploy `InvokeOnMainThreadAsync_Repro.Android` to an iOS Device or Simulator

3. Tap the Button titled `No Crash`

4. Confirm the animation completes successfully

5. Tap the Button titled `Crash1`

6. Confirm the app crashes with `NullReferenceException`

7. Build/Deploy `InvokeOnMainThreadAsync_Repro.Android` to an iOS Device or Simulator

8. Tap the Button titled `Crash2`

9. Confirm the app crashes with `NullReferenceException`

![](https://user-images.githubusercontent.com/13558917/60371567-7488ea80-99ae-11e9-8228-a1d8dcee6bc9.gif)

## Environment

=== Visual Studio Enterprise 2019 for Mac (Preview) ===

Version 8.2 Preview (8.2 build 874)

Installation UUID: cc9e7f9a-b3f2-4071-84c4-dd78154d98de

	GTK+ 2.24.23 (Raleigh theme)

	Xamarin.Mac 5.14.0.83 (d16-2 / f08d4e3e)

	Package version: 600000296

=== Mono Framework MDK ===

Runtime:

	Mono 6.0.0.296 (2019-02/1e9f3bfbc5a) (64-bit)

	Package version: 600000296

=== NuGet ===

Version: 5.1.0.6013

=== .NET Core ===

Runtime: /usr/local/share/dotnet/dotnet

Runtime Versions:

	3.0.0-preview6-27804-01

	3.0.0-preview5-27626-15

	3.0.0-preview3-27503-5

	3.0.0-preview-27324-5

	3.0.0-preview-27122-01

	2.2.4

	2.2.0

	2.2.0-preview3-27014-02

	2.1.9

	2.1.8

	2.1.6

	2.1.2

	2.1.1

	2.0.6

	2.0.5

	1.1.10

	1.0.13

SDK: /usr/local/share/dotnet/sdk/3.0.100-preview6-012264/Sdks

SDK Versions:

	3.0.100-preview6-012264

	3.0.100-preview5-011568

	2.2.203

	2.1.505

MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/6.0.0/lib/mono/msbuild/Current/bin/Sdks

=== Xamarin.Profiler ===

Version: 1.6.10

Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Apple Developer Tools ===

Xcode 10.2.1 (14490.122)

Build 10E1001

=== Xamarin Designer ===

Version: 16.2.0.325

Hash: f10cfbf83

Branch: remotes/origin/d16-2

Build date: 2019-06-19 19:00:46 UTC

=== Xamarin.Android ===

Version: 9.4.0.34 (Visual Studio Enterprise)

Commit: xamarin-android/d16-2/7cce305

Android SDK: /Users/bramin/Library/Android/sdk

	Supported Android versions:

		6.0 (API level 23)

		7.0 (API level 24)

		7.1 (API level 25)

		8.0 (API level 26)

		8.1 (API level 27)

SDK Tools Version: 26.1.1

SDK Platform Tools Version: 28.0.2

SDK Build Tools Version: 28.0.3

Build Information: 

Mono: mono/mono/2019-02@c6edaa62f94

Java.Interop: xamarin/java.interop/d16-2@b2b2610

LibZipSharp: grendello/LibZipSharp/d16-2@caa0c74

LibZip: nih-at/libzip/rel-1-5-1@b95cf3f

ProGuard: xamarin/proguard/master@905836d

SQLite: xamarin/sqlite/3.27.1@8212a2d

Xamarin.Android Tools: xamarin/xamarin-android-tools/master@4f717b6

=== Microsoft Mobile OpenJDK ===

Java SDK: /Users/bramin/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_8.0.25

1.8.0-25

Android Designer EPL code available here:

https://github.com/xamarin/AndroidDesigner.EPL

=== Android Device Manager ===

Version: 1.2.0.58

Hash: d03e3ea

Branch: remotes/origin/d16-2

Build date: 2019-06-19 16:30:22 UTC

=== Xamarin.Mac ===

Version: 5.14.0.91 (Visual Studio Enterprise)

Hash: 2f1cc7bb

Branch: d16-2

Build date: 2019-06-07 02:49:23-0400

=== Xamarin.iOS ===

Version: 12.14.0.91 (Visual Studio Enterprise)

Hash: 2f1cc7bb

Branch: d16-2

Build date: 2019-06-07 02:49:22-0400

=== Xamarin Inspector ===

Version: 1.4.3

Hash: db27525

Branch: 1.4-release

Build date: Mon, 09 Jul 2018 21:20:18 GMT

Client compatibility: 1

=== Build Information ===

Release ID: 802000874

Git revision: e57770efe0d2b92ade1e1b75e52731614e5f9487

Build date: 2019-06-25 19:43:32+00

Build branch: release-8.2-preview2

Xamarin extensions: a74fb3eb8717fbcb82500b3a107694ad5185aa48

=== Operating System ===

Mac OS X 10.14.5

Darwin 18.6.0 Darwin Kernel Version 18.6.0

    Thu Apr 25 23:16:27 PDT 2019

    root:xnu-4903.261.4~2/RELEASE_X86_64 x86_64

=== Enabled user installed extensions ===

NuGet Package Management Extensions 0.19