Loading an array of one item into a WPF ListBox - wpf

Question

I am experiencing an issue with this code where if item(s) in the array returns less than two strings, the string is display as a list.
For example if I have two clusters. The listbox would give me the option to select let's say Test-Cluster and Dev-Cluster; however, if only Test-Cluster is the only available cluster, the listbox would display each letter of the string as a different option in the list box. I can't seem to figure out why. See picture:
#event: when Environment is selected
$wpFBoxEnvironment.Add_DropDownClosed({
Disconnect-VIServer * -Confirm:$false
#empty VCenters inside form
$wpFBoxSrcVCenter.Items.Clear()
$wpFListTgtVCenters.Items.Clear()
#empty Source VMs inside form
$wpFListSrcVMs.Items.Clear()
#validate VI servers connetion and connect if session doesn't exist
$VServers = $vdiEnvironments |
Where-Object Env -like $wpFBoxEnvironment.Text
#notify use to wait for vCenter server login
Write-Host "Logging in to all $($wpFBoxEnvironment.Text) servers. Please wait..."
foreach ($VServer in $VServers) {
$sessionID = ($global:DefaultVIServers | Where-Object -FilterScript {$_.Name -like $VServer.Name}).sessionId
if ($sessionID) {
Connect-VIServer -Server $VServer.Name -Session $sessionID
} elseif ($credential) {
Connect-VIServer -Server $VServer.Name -Credential $credential
} else {
throw 'Connection Error'
}
}
$clusters = Get-Cluster | Select-Object Name, Uid
$clusters | ForEach-Object {
$_ | Add-Member -MemberType NoteProperty -Name VCName -Value $_.Uid.Split('#')[1].Split(':')[0]
}
$datastores = Get-Datastore | Select-Object -Property Name, DatastoreBrowserPath, FreeSpaceMB, CapacityMB
$datastores | ForEach-Object {
$_ | Add-Member -MemberType NoteProperty -Name VCName -Value $_.DatastoreBrowserPath.Split('\')[1].replace('#443','')
$_.FreeSpaceMB = [int]$_.FreeSpaceMB
$_.CapacityMB = [int]$_.CapacityMB
}
$portgroups = Get-VDPortgroup | Select-Object VlanConfiguration, Name, NumPorts, Uid | ? VlanConfiguration -notlike "*0-4094*"
$portgroups | ForEach-Object {
$_ | Add-Member -MemberType NoteProperty -Name VCName -Value $_.Uid.Split('#')[1].Split(':')[0]
$_.NumPorts = [int]$_.NumPorts
}
$vCenters = #()
foreach ($vCenter in $VDIEnvironments) {
#Find single clusters and padd array
if (($clusters | ? VCName -like $vCenter.Name).Count -eq 1) {
$clusters += ("-----")
}
$vCenter |
Add-Member -MemberType NoteProperty -Name TargetCluster -Value (
$clusters | ? VCName -like $vCenter.Name
)[0].Name -Force
$vCenter |
Add-Member -MemberType NoteProperty -Name Clusters -Value $(
$clusters | ? VCName -like $vCenter.Name
).Name -Force
$vCenter |
Add-Member -MemberType NoteProperty -Name TargetDatastore -Value $(
$datastores | ? VCName -like $vCenter.Name | Sort-Object -Descending FreeSpaceMB
)[0].Name -Force
$vCenter |
Add-Member -MemberType NoteProperty -Name Datastores -Value $(
$datastores | ? VCName -like $vCenter.Name
).Name -Force
$vCenter |
Add-Member -MemberType NoteProperty -Name TargetPortgroup -Value (
$portgroups | ? VCName -like $vCenter.Name | Sort-Object -Descending NumPorts
)[0].Name -Force
$vCenter |
Add-Member -MemberType NoteProperty -Name Portgroups -Value $(
$portgroups | ? VCName -like $vCenter.Name
).Name -Force
$vCenters += $vCenter
}
#fill VCenters inside form from selected Environment
$selectedVCenters = $vCenters |
Where-Object Env -like $wpFBoxEnvironment.Text |
Where-Object Datastores -ne $Null
$selectedVCenters | ForEach-Object {
$wpFBoxSrcVCenter.Items.Add($_.Name)
$wpFListTgtVCenters.Items.Add($_)
$wpFListTgtVCenters.SelectedItems.Add($_)
}
})
<GridViewColumn Header="Target Cluster"
Width="160" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding 'Clusters'}"
SelectedItem="{Binding Path='TargetCluster', Mode=TwoWay}"
Width="145"
/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>

Answer 1

I think it's because you are iterating over either an array, or in the case of a single item, a string. Try predefining your array then add (+=) to it. That way in the case of a single string it will still be an array:
Edit:
Looking at the data, it looks like you may have to explicitly convert the single string to an array by wrapping $_ in #(..) to get: #($_)
This will either convert the string into a single value array, or keep the existing array. More info: about_arrays
...
#fill VCenters inside form from selected Environment
$selectedVCenters = #()
$selectedVCenters += $vCenters |
Where-Object Env -like $wpFBoxEnvironment.Text |
Where-Object Datastores -ne $Null
$selectedVCenters | ForEach-object {
$wpFBoxSrcVCenter.Items.Add($_.Name)
$wpFListTgtVCenters.Items.Add(#($_))
$wpFListTgtVCenters.SelectedItems.Add($_)
}