Update SandboxTest.ps1 to use HttpClient instead of WebClient (#240691)

Author: Trenly

Tools/SandboxTest.ps1

@@ -89,7 +89,7 @@ $script:HostGeoID = (Get-WinHomeLocation).GeoID
 
 # Misc
 [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
-$script:WebClient = New-Object System.Net.WebClient
+$script:HttpClient = New-Object System.Net.Http.HttpClient
 $script:CleanupPaths = @()
 
 # The experimental features get updated later based on a switch that is set
@@ -114,7 +114,7 @@ function Invoke-CleanExit {
         [int] $ExitCode
     )
     Invoke-FileCleanup -FilePaths $script:CleanupPaths
-    $script:WebClient.Dispose()
+    $script:HttpClient.Dispose()
     Write-Debug "Exiting ($ExitCode)"
     exit $ExitCode
 }
@@ -186,7 +186,8 @@ function Get-RemoteContent {
     Write-Debug "Remote content will be stored at $($localFile.FullName)"
     $script:CleanupPaths += $Raw ? @($localFile.FullName) : @() # Mark the file for cleanup when the script ends if the raw data was requested
     try {
-        $script:WebClient.DownloadFile($URL, $localFile.FullName)
+        $downloadTask = $script:HttpClient.GetByteArrayAsync($URL)
+        [System.IO.File]::WriteAllBytes($localfile.FullName, $downloadTask.Result)
     }
     catch {
         # If the download fails, write a zero-byte file anyways
@@ -295,7 +296,7 @@ if (!$SkipManifestValidation -and ![String]::IsNullOrWhiteSpace($Manifest)) {
         Invoke-CleanExit -ExitCode 3
     }
     Write-Information "--> Validating Manifest"
-    $validateCommandOutput = 
+    $validateCommandOutput =
         & {
             # Store current output encoding setting
             $prevOutEnc = [Console]::OutputEncoding
@@ -306,7 +307,7 @@ if (!$SkipManifestValidation -and ![String]::IsNullOrWhiteSpace($Manifest)) {
 
             # Reset the encoding to the previous values
             [Console]::OutputEncoding = $prevOutEnc
-        }    
+        }
         switch ($LASTEXITCODE) {
         '-1978335191' {
             ($validateCommandOutput | Select-Object -Skip 1 -SkipLast 1) | Write-Information # Skip the first line and the empty last line