A helper command to quickly switch current Azure Contexts

Switch-AZContext.ps1

using namespace System.Management.Automation.Host
function Switch-AzContext {
    param (
        [Parameter(ValueFromPipeline)]
        [Microsoft.Azure.Commands.Profile.Models.Core.PSAzureContext[]]
        [ValidateNotNullOrEmpty()]
        $Contexts = (Get-AzContext -ListAvailable | Sort-Object Name),
        [Switch]$GUI
    )

    $currentContext = Get-AzContext

    if (-not $Contexts) {throw 'No Contexts available, run Connect-AzAccount first!'}
    if ($Contexts.count -eq 1) {write-warning "Context $($Contexts.Name) the only context available"; return}

    $defaultIndex = 0
    $i = 1

    $ContextToSet = if ($GUI -and (Get-Command 'Out-Gridview' -ErrorAction SilentlyContinue)) {
        $Contexts | Out-Gridview -OutputMode Single -Title "Select a new Default Azure Context"
    } elseif ($psedition -ne 'Desktop' -and -not $IsWindows -and (Get-Command 'Out-ConsoleGridview' -ErrorAction SilentlyContinue)) {
        $Contexts | Out-ConsoleGridview -OutputMode Single -Title "Select a new Default Azure Context"
    } else {
        [ChoiceDescription[]]$contextPrompts = $Contexts.foreach{
            [ChoiceDescription]::New("&$i $($PSItem.Name)")
            if ($PSItem.Name -eq $currentContext.Name) {
                $defaultIndex = $i - 1
            }
            $i++
        }
        $result = $Host.UI.PromptForChoice(
            $null, #caption
            'Select a new Default Azure Context' + [Environment]::NewLine + '==================================', #message
            $ContextPrompts, #choices
            $defaultIndex #defaultChoice
        )
        $Contexts[$result]
    }

    Set-AzContext -Context $ContextToSet > $null
}