Merge pull request #202 from sqlkata/when_not

add when not

Author: ahmad-moussawi

QueryBuilder/Query.cs

@@ -194,13 +194,19 @@ public Query Distinct()
         /// Apply the callback's query changes if the given "condition" is true.
         /// </summary>
         /// <param name="condition"></param>
-        /// <param name="callback"></param>
+        /// <param name="whenTrue">Invoked when the condition is true</param>
+        /// <param name="whenFalse">Optional, invoked when the condition is false</param>
         /// <returns></returns>
-        public Query When(bool condition, Func<Query, Query> callback)
+        public Query When(bool condition, Func<Query, Query> whenTrue, Func<Query, Query> whenFalse = null)
         {
-            if (condition)
+            if (condition && whenTrue != null)
             {
-                return callback.Invoke(this);
+                return whenTrue.Invoke(this);
+            }
+
+            if (!condition && whenFalse != null)
+            {
+                return whenFalse.Invoke(this);
             }
 
             return this;