Bug 60824 - MSB3026 and MSB3027 with .netstandard 2
Summary: MSB3026 and MSB3027 with .netstandard 2
Status: RESOLVED ANSWERED
Alias: None
Product: Visual Studio Extensions
Classification: Xamarin
Component: Android ()
Version: 4.7.0 (15.4)
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2017-11-23 09:13 UTC by Miha Markic
Modified: 2017-11-24 15:31 UTC (History)
4 users (show)

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

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Status:
RESOLVED ANSWERED

Description Miha Markic 2017-11-23 09:13:47 UTC
Info below.
I have a solution that is like Android -> Android -> .netstandard2 -> .netstandard2.

Upon solution rebuild the bottom .netstandard2 project can't:

error MSB3027: Could not copy "obj\Debug\netstandard2.0\PROJECTNAME.dll" to "bin\Debug\netstandard2.0\PROJECTNAME.dll". Exceeded retry count of 10. Failed.

Of course, restarting VS does the trick for a build or two.



Microsoft Visual Studio Enterprise 2017 
Version 15.4.4
VisualStudio.15.Release/15.4.4+27004.2009
Microsoft .NET Framework
Version 4.7.02556

Installed Version: Enterprise

Architecture Diagrams and Analysis Tools   00369-90200-01701-AA812
Microsoft Architecture Diagrams and Analysis Tools

Visual Basic 2017   00369-90200-01701-AA812
Microsoft Visual Basic 2017

Visual C# 2017   00369-90200-01701-AA812
Microsoft Visual C# 2017

Visual C++ 2017   00369-90200-01701-AA812
Microsoft Visual C++ 2017

Application Insights Tools for Visual Studio Package   8.9.00809.2
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2017   15.0.30925.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services   1.0
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2017   5.2.50921.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0   15.0.30915.0
Azure App Service Tools v3.0.0

Cake for Visual Studio   0.1.2.0
Adds support for the Cake build tool in Visual Studio 2015 and 2017. Includes support for the Task Runner Explorer, new templates and bootstrapping important Cake files.

CodeRush for Roslyn   17.2.3.0
DevExpress CodeRush for Roslyn package.

CodeRush for Roslyn Tool Windows   17.2.3.0
DevExpress CodeRush for Roslyn Tool Windows package.

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

CreateLayoutWizard   1.0
Create layout wizard.

DevExpress.DeploymentTool   1.0
A useful tool for deploying DevExpress assemblies.

DevExpress.Win.LayoutAssistant Extension   1.0
DevExpress.Win.LayoutAssistant Visual Studio Extension Detailed Info

GitHub.VisualStudio   2.3.5.346
A Visual Studio Extension that brings the GitHub Flow into Visual Studio.

JavaScript Language Service   2.0
JavaScript Language Service

JavaScript Project System   2.0
JavaScript Project System

JavaScript UWP Project System   2.0
JavaScript UWP Project System

Markdown Editor   1.11.214
A full featured Markdown editor with live preview and syntax highlighting. Supports GitHub flavored Markdown.

Merq   1.1.17-rc (cba4571)
Command Bus, Event Stream and Async Manager for Visual Studio extensions.

Microsoft Continuous Delivery Tools for Visual Studio   0.3
Simplifying the configuration of continuous build integration and continuous build delivery from within the Visual Studio IDE.

Microsoft JVM Debugger   1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards   1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

Mono Debugging for Visual Studio   4.7.4-pre (c2d89eb)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager   4.4.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Project File Tools   1.0.1
Provides Intellisense and other tooling for XML based project files such as .csproj and .vbproj files.

SlowCheetah - XML config transforms   1.0
This package enables you to transform your app.config or any other XML file based on the build configuration. It also adds additional tooling to help you create XML transforms.

SQL Server Data Tools   15.1.61707.200
Microsoft SQL Server Data Tools

Syntax Visualizer   1.0
An extension for visualizing Roslyn SyntaxTrees.

TypeScript   2.3.5.0
TypeScript tools for Visual Studio

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Universal Windows Apps   15.0.27004.2008
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.

VisualStudio.IoT   1.0
Package with IoT components for Visual Studio

VisualStudio.Mac   1.0
Mac Extension for Visual Studio

Web Compiler   1.11.326
Compiler for LESS, Sass and CoffeeScript files

WiX Toolset Visual Studio Extension   0.9.21.62588
WiX Toolset Visual Studio Extension version 0.9.21.62588
Copyright (c) .NET Foundation and contributors. All rights reserved.

Xamarin   4.7.10.38 (34c1b6c)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android SDK   8.0.2.1 (HEAD/c2a33d8ea)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS and Xamarin.Mac SDK   11.3.0.47 (51128b8)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

XtraReports package   1.0
XtraReports package
Comment 1 Miha Markic 2017-11-23 13:26:16 UTC
MSBuild is holding the file. I didn't spot it before because Windows 10 Falls Creator update now groups MSBuild processes under VS.
Comment 2 Joaquin Jares 2017-11-24 13:38:40 UTC
This looks very similar to https://bugzilla.xamarin.com/show_bug.cgi?id=60164. In that case, Fody PropertyChanged was locking the file. The fix if you're using that is super simple: just upgrade Fody (not the weaver, the root package) to 2.2 or later. With .NetStandard you'll need to actually install that package. The dependency that you get automatically is 2.0, which has the bug.

Please let me know if this looks like your issue.

Regards,
joj
Comment 3 Miha Markic 2017-11-24 15:31:01 UTC
Hi Joaquin,

Indeed, I'm using Fody, and was using <2.2.0. Upgrading to 2.2.1 seems fixing the issue, so I'll close this bug.

Thanks very much,
Miha