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Get-PackagesUsingHashtable.ps1
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function Get-PackagesUsingHashtable {
<#
.SYNOPSIS
Gets a list of installed "software packages" (typically NuGet packages) for each
entry in a hashtable.
.DESCRIPTION
The Get-PackagesUsingHashtable function steps through each entry in the supplied
hashtable. If a corresponding package is installed, then the information about
the newest version of that package is stored in the value of the hashtable entry
corresponding to the software package.
.PARAMETER ReferenceToHashtable
Is a reference to a hashtable. The value of the reference should be a hashtable
with keys that are the names software packages and values that are initialized
to be $null.
.EXAMPLE
$hashtablePackageNameToInstalledPackageMetadata = @{}
$hashtablePackageNameToInstalledPackageMetadata.Add('Accord', $null)
$hashtablePackageNameToInstalledPackageMetadata.Add('Accord.Math', $null)
$hashtablePackageNameToInstalledPackageMetadata.Add('Accord.Statistics', $null)
$hashtablePackageNameToInstalledPackageMetadata.Add('Accord.MachineLearning', $null)
$refHashtablePackageNameToInstalledPackages = [ref]$hashtablePackageNameToInstalledPackageMetadata
Get-PackagesUsingHashtable -ReferenceToHashtable $refHashtablePackageNameToInstalledPackages
This example checks each of the four software packages specified. For each software
package specified, if the software package is installed, the value of the hashtable
entry will be set to the newest-installed version of the package. If the software
package is not installed, the value of the hashtable entry remains $null.
.OUTPUTS
None
.NOTES
Requires PowerShell v5.0 or newer
#>
#region License ################################################################
# Copyright (c) 2025 Frank Lesniak
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#endregion License ################################################################
#region DownloadLocationNotice ################################################
# The most up-to-date version of this script can be found on the author's GitHub
# repository at https://github.com/franklesniak/PowerShell_Resources
#endregion DownloadLocationNotice ################################################
# Version 1.0.20250106.0
[CmdletBinding()]
param (
[Parameter(Mandatory = $true)][ref]$ReferenceToHashtable
)
function Get-PSVersion {
# .SYNOPSIS
# Returns the version of PowerShell that is running.
#
# .DESCRIPTION
# The function outputs a [version] object representing the version of
# PowerShell that is running.
#
# On versions of PowerShell greater than or equal to version 2.0, this
# function returns the equivalent of $PSVersionTable.PSVersion
#
# PowerShell 1.0 does not have a $PSVersionTable variable, so this
# function returns [version]('1.0') on PowerShell 1.0.
#
# .EXAMPLE
# $versionPS = Get-PSVersion
# # $versionPS now contains the version of PowerShell that is running.
# # On versions of PowerShell greater than or equal to version 2.0,
# # this function returns the equivalent of $PSVersionTable.PSVersion.
#
# .INPUTS
# None. You can't pipe objects to Get-PSVersion.
#
# .OUTPUTS
# System.Version. Get-PSVersion returns a [version] value indiciating
# the version of PowerShell that is running.
#
# .NOTES
# Version: 1.0.20250106.0
#region License ####################################################
# Copyright (c) 2025 Frank Lesniak
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#endregion License ####################################################
if (Test-Path variable:\PSVersionTable) {
return ($PSVersionTable.PSVersion)
} else {
return ([version]('1.0'))
}
}
$versionPS = Get-PSVersion
if ($versionPS -lt ([version]'5.0')) {
Write-Warning 'Get-PackagesUsingHashtable requires PowerShell version 5.0 or newer.'
return
}
$WarningPreferenceAtStartOfFunction = $WarningPreference
$VerbosePreferenceAtStartOfFunction = $VerbosePreference
$DebugPreferenceAtStartOfFunction = $DebugPreference
$arrPackagesToGet = @(($ReferenceToHashtable.Value).Keys)
$WarningPreference = [System.Management.Automation.ActionPreference]::SilentlyContinue
$VerbosePreference = [System.Management.Automation.ActionPreference]::SilentlyContinue
$DebugPreference = [System.Management.Automation.ActionPreference]::SilentlyContinue
$arrPackagesInstalled = @(Get-Package)
$WarningPreference = $WarningPreferenceAtStartOfFunction
$VerbosePreference = $VerbosePreferenceAtStartOfFunction
$DebugPreference = $DebugPreferenceAtStartOfFunction
for ($intCounter = 0; $intCounter -lt $arrPackagesToGet.Count; $intCounter++) {
Write-Debug ('Checking for ' + $arrPackagesToGet[$intCounter] + ' software package...')
$arrMatchingPackages = @($arrPackagesInstalled | Where-Object { $_.Name -eq $arrPackagesToGet[$intCounter] })
if ($arrMatchingPackages.Count -eq 0) {
($ReferenceToHashtable.Value).Item($arrPackagesToGet[$intCounter]) = $null
} else {
($ReferenceToHashtable.Value).Item($arrPackagesToGet[$intCounter]) = $arrMatchingPackages[0]
}
}
}