#Windows10 – Cleaning some disk space, Windows SDK and #dotnetcore installs

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I’m very careful with my disk space, however my C: drive in Windows 10 started to claim about low space. I got 3 disks on my machine, 2 SSDs and a regular one; and I always check to install all my software on my D: drive. So, that’s why running low space on C: was shocking.

So, I did a small check on the apps and contents using a lot of disk and I found 2 main sources

  • Windows 10 SDKs
  • DotNet Core SDKs and Runtimes

Every time a new version of Windows 10 is released, and I build a Windows 10 App, I get a new Windows SDK. Each one is around 2GBs, I got almost 20, so make your numbers.

Windows 10 Settings App and Features Apps sizes

Note: There is a cool feature to find usage space of installed apps by this, out of the box in Windows Settings.

The second one was related to .Net Core. I had a lot of versions installed, and every time I get a new update on Visual Studio 2019, it seems that I’m updating also my .Net Core SDKs. Right now, I only care about .Net Core 3, so it was time to uninstall all the others.

The official documentation ” How to remove the .NET Core Runtime and SDK” (see references) wasn’t very helpful. However, it was a good source to learn more about dotnet command, specially this one:

C:\> dotnet --list-sdks

This command list all the installed SDKs, and with a little of PowerShell scripting I manage to uninstall almost everything. Once I started this path, I also realize that the


command was not working, so a little search pointed me into an old article from Scott Hanselman, where he did a similar script to remove old .Net Core versions (see references).

The final script is

# get installed dotNet SDKs
$dnSDKs = dotnet listsdks
Write-Host "—————————"
Write-Host "Installed SDKs:"
foreach ($dnSDK in $dnSDKs) {
Write-Host $dnSDK
Write-Host "—————————"
foreach ($dnSDK in $dnSDKs) {
# get sdk information
$dnSDKSplit = $dnSDK.Split('[', [System.StringSplitOptions]::RemoveEmptyEntries)
$dnSDKVersion = $dnSDKSplit[0]
$dnSDKPath = $dnSDKSplit[1].replace(']', '')
Write-Host " >> Version = " $dnSDKVersion
Write-Host " >> Path = " $dnSDKPath
# uninstall sdk, all but 3.0
if($dnSDKVersion.StartsWith("3.")) {
Write-Host " Keep Version = " $dnSDKVersion
else {
Write-Host " Uninstalling Version = " $dnSDKVersion
$dnAppName = "Microsoft .NET Core SDK – " + $dnSDKVersion
$app = Get-WmiObject Class Win32_Product | Where-Object {
$_.Name -match $dnSDKVersion
Write-Host $app.Name
Write-Host $app.IdentifyingNumber
# official not working
# $app.Uninstall()
# test with Hanselman mode
pushd $env:SYSTEMROOT\System32
$app.identifyingnumber |% { Start-Process msiexec wait ArgumentList "/x $_" }

You can also get the ps1 file directly from GitHub here https://github.com/elbruno/Blog/tree/master/20191016%20Uninstall%20NetCore%20Versions

And a warning, the script will list all the installed dotnet sdks

And then, when the uninstall process start, we will require to confirm each uninstall action. Not very user friendly, but it get the work done!

Final advice is to repair the .Net Core 3 version, just in case something is missing.

Happy coding!

Greetings @ Burlington

El Bruno


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