Convert from MSBuild NuGet Package Restore to Automatic Package Restore. Updates nuget.exe, removes nuget.targets, and removes the nuget.targets references from all .csproj files under the solution directory provided.

ConvertToAutomaticPackageRestore.ps1

[CmdletBinding()]
Param(
    [Parameter(Mandatory=$true)]
    $SolutionDir
)

$SolutionDir = Resolve-Path $SolutionDir
$nugetTargetsPath = Join-Path $SolutionDir ".nuget\nuget.targets"
$nugetExePath = Join-Path $SolutionDir ".nuget\nuget.exe"

if (Test-Path $nugetExePath) {
    Write-Host "Updating NuGet..."
    & $nugetExePath update -self
}

if (Test-Path $nugetTargetsPath) {
    Write-Host "Deleting '.nuget\nuget.targets'..."
    Remove-Item $nugetTargetsPath
}

$projectCount = 0
ls -Path $SolutionDir *.csproj -Recurse | % { 
    Write-Verbose "Modifying $($_.Name)..."

    $contents = Select-String -InputObject $_ -Pattern '^.*<import.*nuget\.targets.*/>.*$' -NotMatch | Select -ExpandProperty Line     
    Out-File -InputObject $contents -FilePath $_.Fullname -Encoding UTF8

    $projectCount++
}

Write-Host ("{0} projects processed." -f $projectCount)