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src/Sdk/DTExpressions/Expressions/CollectionAccessors/JObjectAccessor.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json.Linq;
+
+namespace GitHub.DistributedTask.Expressions.CollectionAccessors
+{
+    internal sealed class JObjectAccessor : IReadOnlyObject
+    {
+        public JObjectAccessor(JObject jobject)
+        {
+            m_jobject = jobject;
+        }
+
+        public Int32 Count => m_jobject.Count;
+
+        public IEnumerable<String> Keys => (m_jobject as IDictionary<String, JToken>).Keys;
+
+        // This uses Select. Calling .Values directly throws an exception.
+        public IEnumerable<Object> Values => (m_jobject as IDictionary<String, JToken>).Select(x => x.Value);
+
+        public Object this[String key] => m_jobject[key];
+
+        public Boolean ContainsKey(String key)
+        {
+            return (m_jobject as IDictionary<String, JToken>).ContainsKey(key);
+        }
+
+        public IEnumerator<KeyValuePair<String, Object>> GetEnumerator()
+        {
+            return (m_jobject as IDictionary<String, JToken>).Select(x => new KeyValuePair<String, Object>(x.Key, x.Value)).GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return (m_jobject as IDictionary<String, JToken>).Select(x => new KeyValuePair<String, Object>(x.Key, x.Value)).GetEnumerator();
+        }
+
+        public Boolean TryGetValue(
+            String key,
+            out Object value)
+        {
+            if ((m_jobject as IDictionary<String, JToken>).TryGetValue(key, out JToken val))
+            {
+                value = val;
+                return true;
+            }
+
+            value = null;
+            return false;
+        }
+
+        private readonly JObject m_jobject;
+    }
+}