1 files changed, 34 insertions, 0 deletions
diff --git a/dsa/FireBase/Query/OrderQuery.cs b/dsa/FireBase/Query/OrderQuery.cs
new file mode 100644
index 0000000..302d1a3
--- /dev/null
+++ b/dsa/FireBase/Query/OrderQuery.cs
@@ -0,0 +1,34 @@
+using System;
+
+namespace Firebase.Database.Query
+{
+    /// <summary>
+    ///     Represents a firebase ordering query, e.g. "?OrderBy=Foo".
+    /// </summary>
+    public class OrderQuery : ParameterQuery
+    {
+        private readonly Func<string> propertyNameFactory;
+
+        /// <summary>
+        ///     Initializes a new instance of the <see cref="OrderQuery" /> class.
+        /// </summary>
+        /// <param name="parent"> The query parent. </param>
+        /// <param name="propertyNameFactory"> The property name. </param>
+        /// <param name="client"> The owning client. </param>
+        public OrderQuery(ChildQuery parent, Func<string> propertyNameFactory, FirebaseClient client)
+            : base(parent, () => "orderBy", client)
+        {
+            this.propertyNameFactory = propertyNameFactory;
+        }
+
+        /// <summary>
+        ///     The build url parameter.
+        /// </summary>
+        /// <param name="child"> The child. </param>
+        /// <returns> The <see cref="string" />. </returns>
+        protected override string BuildUrlParameter(FirebaseQuery child)
+        {
+            return $"\"{propertyNameFactory()}\"";
+        }
+    }
+}
+\ No newline at end of file