implements a read only data access,

data that is not intent to be changed

BookAStar/BookAStar/Helpers/RemoteEntityRO.cs

@@ -0,0 +1,24 @@
+using BookAStar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BookAStar.Helpers
+{
+    class RemoteEntityRO<V,K>: RemoteEntity<V,K> where K: IEquatable<K>
+    {
+        public RemoteEntityRO (string controllerName,
+            Func<V,K> getKey) : base(controllerName,getKey)
+        {
+        }
+
+        protected override void UpdateOrAdd(V item)
+        {
+            var key = GetKey(item);
+            if (this.Any(x => GetKey(x).Equals(key))) { return; }
+            Add(item);
+        }
+    }
+}