[Automation]Fix the issue of processing PSCustomObject (Azure#14045)

* Fix the issue of processing PSCustomObject.

* Add changelog

* Update ChangeLog.md

Co-authored-by: wyunchi-ms <yunwang@microsoft.com>

src/Automation/Automation/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed the issue of processing `PSCustomObject` and `Array`.
 
 ## Version 1.4.2
 * Fixed issue where description was not populated for update management schedules

src/Automation/Automation/Common/PowershellJsonConverter.cs

@@ -20,6 +20,9 @@
 using System.Management.Automation;
 using System.Text;
 using Newtonsoft.Json;
+using Microsoft.WindowsAzure.Commands.Utilities.Common;
+using System.Linq;
+using System.Collections.Generic;
 
 namespace Microsoft.Azure.Commands.Automation.Common
 {
@@ -31,20 +34,41 @@ public static string Serialize(object inputObject)
             {
                 return null;
             }
-            while(inputObject is PSObject && ((PSObject)inputObject).BaseObject != null)
+            if (inputObject is string @str)
             {
-                inputObject = ((PSObject)inputObject).BaseObject;
+                return str.Trim();
             }
-            if(inputObject is string)
+            else if (inputObject is object[] @objectArray)
             {
-                inputObject = ((string)inputObject).Trim();
+                return SerializeArray(objectArray);
+            }
+            else if (inputObject is PSObject @psObject)
+            {
+                return SerializePsObject(psObject);
             }
             return JsonConvert.SerializeObject(inputObject);
         }
 
+        private static string SerializePsObject(PSObject @psObject)
+        {
+            Dictionary<string, string> hashTable = new Dictionary<string, string>();
+            foreach (var item in @psObject.Properties)
+            {
+                hashTable.Add(item.Name, Serialize(item.Value));
+            }
+
+            return JsonConvert.SerializeObject(hashTable);
+        }
+
+        private static string SerializeArray(object[] objectArray)
+        {
+            List<object> objectList = objectArray.ToList();
+            return string.Format("[{0}]", string.Join(",", objectList.Select(Serialize).ToList()));
+        }
+
         public static PSObject Deserialize(string json)
         {
-            if (String.IsNullOrEmpty(json))
+            if (string.IsNullOrEmpty(json))
             {
                 return null;
             }