Merge pull request microsoft#1491 from microsoft/api_prop_pipeline_update

Update apiProperties_validator.yml for Azure Pipelines

Author: taylor-hazlett

.pipelines/apiProperties_validator.yml

@@ -17,9 +17,12 @@ steps:
       foreach ($file in $apiPropertiesFiles) { 
         $newFileContent = Get-Content $file -Raw
 
+        $newFileContentAsList = New-Object Collections.Generic.List[Object]
+        $newFileContentAsList.add($newFileContent)
+
         # Validate apiProperties json
         $apiPropertiesValidatorUri = "$($env:apiPropertiesValidator)?api-version=2021-05-01&suppressWarnings=true"
-        $results = Invoke-RestMethod -Uri $apiPropertiesValidatorUri -Headers $Headers -Method Post -ContentType "application/json; charset=utf-8" -Body @($newFileContent)
+        $results = Invoke-RestMethod -Uri $apiPropertiesValidatorUri -Headers $Headers -Method Post -ContentType "application/json; charset=utf-8" -Body $newFileContentAsList
 
         $errors = $results | Where-Object { $_.level -EQ "Critical" -OR $_.Level -EQ "Error" }
         $warnings = $results | Where-Object { $_.level -EQ "Warning" }