如何解决Add-PSSnapin Microsoft.TeamFoundation.PowerShell和Get-TfsChildItem错误？

Question

Below is the PowerShell Script that I am using to download the folder from TFS 2013 Update 4 to my local machine but i am getting some exception which I have copied below the code.

$AutoDeployDir = "$/Intel/Installscript/Utility Scripts"
$deployDirectory = "C:\powershell scripts\New folder\Demo TFS Code"

# Add TFS 2013 dlls so we can download some files
[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.TeamFoundation.Client")
[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.TeamFoundation.VersionControl.Client")
$tfsCollectionUrl = "http://stptfs2013dbsvr:8080/tfs/intelcollection"
$tfsCollection = New-Object -TypeName Microsoft.TeamFoundation.Client.TfsTeamProjectCollection -ArgumentList $tfsCollectionUrl
$tfsVersionControl = $tfsCollection.GetService([Microsoft.TeamFoundation.VersionControl.Client.VersionControlServer])

# Register PowerShell commands
Add-PSSnapin Microsoft.TeamFoundation.PowerShell

# Get all directories and files in the AutoDeploy directory
$items = Get-TfsChildItem $AutoDeployDir -Recurse -Server $tfsCollection

# Download each item to a specific destination
foreach ($item in $items) {
    # Serverpath of the item
    Write-Host "TFS item to download:" $($item.ServerItem) -ForegroundColor Blue

    $destinationPath = $item.ServerItem.Replace($AutoDeployDir, $deployDirectory)
    Write-Host "Download to" $([IO.Path]::GetFullPath($destinationPath)) -ForegroundColor Blue

    if ($item.ItemType -eq "Folder") {
        New-Item $([IO.Path]::GetFullPath($destinationPath)) -ItemType Directory -Force
    }
    else {
        # Download the file (not folder) to destination directory
        $tfsVersionControl.DownloadFile($item.ServerItem, $([IO.Path]::GetFullPath($destinationPath)))
    }
}

Exception that occurs is:

Add-PSSnapin : The Windows PowerShell snap-in 'Microsoft.TeamFoundation.PowerShell' is not installed on this computer.
At C:\powershell scripts\demo1.ps1:12 char:1
+ Add-PSSnapin Microsoft.TeamFoundation.PowerShell
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (Microsoft.TeamFoundation.PowerShell:String) [Add-PSSnapin], PSArgumentException
    + FullyQualifiedErrorId : AddPSSnapInRead,Microsoft.PowerShell.Commands.AddPSSnapinCommand

Get-TfsChildItem : The term 'Get-TfsChildItem' is not recognized as the name of a cmdlet, function, script file, or operable program. Check 
the spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\powershell scripts\demo1.ps1:15 char:10
+ $items = Get-TfsChildItem $AutoDeployDir -Recurse -Server $tfsCollection
+          ~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-TfsChildItem:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Answer 1

Please make sure you have fully installed the TFS Powertools .

By default it doesn't install the PowerShell CmdLets . If it is, just install it and then the issue will be gone.

Another possibility is that the PowerShell Snap-in is stored in the inconsistent registry with the OS version (32bit/64bit).

PowerTools installer is 32bit, on 64bit machine, it will write to HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\PowerShell\\1\\PowerShellSnapIns , but not to HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\PowerShell\\1\\PowerShellSnapIns.

Reference this similar thread for details: TFS Power Tools 2008 Powershell Snapin won't run in on 64-bit in Windows 2008 R2?