Bug 60331 - Saving and Updating a layout XML file prevents building the project until background task is finished executing.
Summary: Saving and Updating a layout XML file prevents building the project until bac...
Status: CONFIRMED
Alias: None
Product: Android
Classification: Xamarin
Component: MSBuild ()
Version: 8.0 (15.4)
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: dean.ellis
URL:
Depends on:
Blocks:
 
Reported: 2017-10-23 17:57 UTC by Jon Douglas [MSFT]
Modified: 2017-10-23 18:17 UTC (History)
1 user (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
CONFIRMED

Description Jon Douglas [MSFT] 2017-10-23 17:57:42 UTC
## Description:

When saving/updating a layout XML file, it seems that a task is fired to the background to regenerate the resource.designer.cs file. However there is no indication to the user that this task is running or needs to be completed in order to build the project. Instead it will just fail the build with other errors instead. I believe this is happening around the following tasks/targets:

https://github.com/xamarin/xamarin-android/blob/master/src/Xamarin.Android.Build.Tasks/Tasks/GenerateResourceDesigner.cs

https://github.com/xamarin/xamarin-android/blob/8643ded9eebca2984e886585926b27bd803738a1/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets#L1109

Because this occurs in 15.4 and 15.5, I would suspect that it's an issue with design-time builds as this occurs after modifying a layout resource which is a project file.

## Actual Results:

Build Fails with the follow error messages from other projects

1>------ Build started: Project: Utilities, Configuration: Debug Any CPU ------
2>Project 'Html.Core.PCL' is not up to date. Input file 'c:\users\dougl\downloads\msnapps.win\msnapps.html2xaml\html.core.pcl\core\classify\classifiercontext.cs' is modified after output file ''.
2>------ Build started: Project: Html.Core.PCL, Configuration: Debug Any CPU ------
3>Project 'Services.PCL' is not up to date. Input file 'c:\users\dougl\downloads\msnapps.win\private\common\services.pcl\ads\models\ad.cs' is modified after output file ''.

If you wait around 10+ seconds, you can build the project just fine.

## Expected Results:

The build should either be able to fire off and start building, or the ability to build the project should be greyed out and indicated that a background task needs to finish before building.

## Version Information:

Visual Studio 2017

15.4 - Xamarin.Android 8.0.0.33
15.5 - Xamarin.Android 8.1.0.20