Create a Custom Detection Script for .NET Core Runtime 3.1 (PowerShell)

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Microsoft Endpoint Manager Configuration Manager (MEMCM / SCCM) and Microsoft Intune use Detection Rules to determine the presence of Applications & Win32 Apps. The detection rules ensure that application installations only begin to run if the application is not already installed on the device. This article will serve as an informative guide and give you a clear understanding of how to create an updated custom detection script for each new version of .NET Core Runtime 3.1 using PowerShell.

How to Create a Custom Detection Script for .NET Core Runtime 3.1

.NET Core Runtime 3.1 x86 (Registry Detection Method)

## Check for .NET Core Runtime 3.1 x86 (Registry Detection Method)
$Runtime31x86 = Get-ChildItem -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall","HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall" | Get-ItemProperty | Where-Object {$_.DisplayName -like 'Microsoft .NET Core Runtime*3.1*(x86)' -and $_.UninstallString -notlike 'MsiExec.exe*' } | Select-Object -Property DisplayName, DisplayVersion, PSChildName
$Runtime31x86.DisplayVersion
$Runtime31x86.PSChildName

## Create Text File with .NET Core Runtime 3.1 x86 Registry Detection Method
$FilePath = "C:\Windows\Temp\NET_Runtime_31_x86_Detection_Method.txt"
New-Item -Path "$FilePath" -Force
Set-Content -Path "$FilePath" -Value "If([Version](Get-ItemPropertyValue -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$($Runtime31x86.PSChildName)','HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\$($Runtime31x86.PSChildName)' -Name DisplayVersion -ea SilentlyContinue) -ge '$($Runtime31x86.DisplayVersion)') {"
Add-Content -Path "$FilePath" -Value "Write-Host `"Installed`""
Add-Content -Path "$FilePath" -Value "Exit 0"
Add-Content -Path "$FilePath" -Value "}"
Add-Content -Path "$FilePath" -Value "else {"
Add-Content -Path "$FilePath" -Value "Exit 1"
Add-Content -Path "$FilePath" -Value "}"
Invoke-Item $FilePath
  • Click Run Script (F5)
  • A text file will open with the .NET Core Runtime 3.1 x86 Detection Method script required to detect the current version of .NET Core Runtime 3.1 x86 that is installed on the device you are running the script from.

Example: 

If([Version](Get-ItemPropertyValue -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{9d5027e4-b04b-4aa9-92fb-1246f97f9cd7}','HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{9d5027e4-b04b-4aa9-92fb-1246f97f9cd7}' -Name DisplayVersion -ea SilentlyContinue) -ge '3.1.32.31915') {
Write-Host "Installed"
Exit 0
}
else {
Exit 1
}

.NET Core Runtime 3.1 x64 (Registry Detection Method)

## Check for .NET Core Runtime 3.1 x64 (Registry Detection Method)
$Runtime31x64 = Get-ChildItem -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall","HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall" | Get-ItemProperty | Where-Object {$_.DisplayName -like 'Microsoft .NET Core Runtime*3.1*(x64)' -and $_.UninstallString -notlike 'MsiExec.exe*' } | Select-Object -Property DisplayName, DisplayVersion, PSChildName
$Runtime31x64.DisplayVersion
$Runtime31x64.PSChildName

## Create Text File with .NET Core Runtime 3.1 x64 Registry Detection Method
$FilePath = "C:\Windows\Temp\NET_Runtime_31_x64_Detection_Method.txt"
New-Item -Path "$FilePath" -Force
Set-Content -Path "$FilePath" -Value "If([Version](Get-ItemPropertyValue -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$($Runtime31x64.PSChildName)','HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\$($Runtime31x64.PSChildName)' -Name DisplayVersion -ea SilentlyContinue) -ge '$($Runtime31x64.DisplayVersion)') {"
Add-Content -Path "$FilePath" -Value "Write-Host `"Installed`""
Add-Content -Path "$FilePath" -Value "Exit 0"
Add-Content -Path "$FilePath" -Value "}"
Add-Content -Path "$FilePath" -Value "else {"
Add-Content -Path "$FilePath" -Value "Exit 1"
Add-Content -Path "$FilePath" -Value "}"
Invoke-Item $FilePath
  • Click Run Script (F5)
  • A text file will open with the .NET Core Runtime 3.1 x64 Detection Method script required to detect the current version of .NET Core Runtime 3.1 x64 that is installed on the device you are running the script from.

Example: 

If([Version](Get-ItemPropertyValue -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{784973c8-d618-4ac8-97ed-1fd52c5bdf2f}','HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{784973c8-d618-4ac8-97ed-1fd52c5bdf2f}' -Name DisplayVersion -ea SilentlyContinue) -ge '3.1.32.31915') {
Write-Host "Installed"
Exit 0
}
else {
Exit 1
}

Always make sure to test everything in a development environment prior to implementing anything into production. The information in this article is provided “As Is” without warranty of any kind.