msbuild cannot build new style csproj when targetting net462

From @SidShetye on June 19, 2018 23:48

Steps to reproduce

Problem demo’d at the repo at https://github.com/SidShetye/msbuild-newcsproj-issue

Expected behavior

build the project like VS2017 gui does on the same machine

Actual behavior

build fails even though there are no nuget dependencies

Build FAILED.

    "C:\temp\new-old-proj-mix-soln\ClassLibraryFw462NewProj\ClassLibraryFw462NewProj.csproj" (build target) (1) ->
    (ResolvePackageAssets target) ->
        C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(198,5): error :
    Assets file 'C:\temp\new-old-proj-mix-soln\ClassLibraryFw462NewProj\obj\project.assets.json' not found. Run a NuGet package restore
        to generate this file. [C:\temp\new-old-proj-mix-soln\ClassLibraryFw462NewProj\ClassLibraryFw462NewProj.csproj]

    0 Warning(s)
    1 Error(s)

Environment data

msbuild /version output:

Microsoft (R) Build Engine version 15.7.179.6572 for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.
15.7.179.6572

OS info: Win 10 x64 v1803 (OS Build 17134.112) VS 2017 (15.7.4)

Copied from original issue: Microsoft/msbuild#3429

[rainersigwald]

Thanks for the detailed report!

All projects that use Microsoft.NET.Sdk require NuGet restore before build. You can accomplish this with a small change to your build script:

diff --git a/DemoProblem.ps1 b/DemoProblem.ps1
index ae1b278..fbcee89 100644
--- a/DemoProblem.ps1
+++ b/DemoProblem.ps1
@@ -37,7 +37,7 @@ gci . -Recurse -Include bin,obj | % { ri -Recurse -Force $_.FullName }
 # And now it barfs :/
 # building in VS2017 (15.7.4) works just fine though
 $cwd=$PSScriptRoot # just point to current directory / soln dir
-msbuild .\ClassLibraryFw462NewProj\ClassLibraryFw462NewProj.csproj /p:SolutionDir=$cwd /p:Configuration=Debug /m /t:build
+msbuild .\ClassLibraryFw462NewProj\ClassLibraryFw462NewProj.csproj /p:SolutionDir=$cwd /p:Configuration=Debug /m /t:build /restore
 
 # dump our msbuild version too
 msbuild /version
\ No newline at end of file

The VS build does NuGet restore independently and silently, which is why it works transparently.

[Amit-Kumar-Sonkar]

what are the way to resolve below Issues while Build is going on from VSTS ?? even after ran dotnet build, dotnet restore not able to fix . ??

C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(198,5): Error : Assets file ‘D:\a\3\s\obj\project.assets.json’ not found. Run a NuGet package restore to generate this file.

Process ‘msbuild.exe’ exited with code ‘1’.