Add Cast to UntypedApi

Author: mythz

src/ServiceStack.OrmLite/IUntypedApi.cs

@@ -22,5 +22,6 @@ public interface IUntypedApi
         int DeleteNonDefaults(object obj, object filter);
         int DeleteById(object id);
         int DeleteByIds(IEnumerable idValues);
+        IEnumerable Cast(IEnumerable results);
     }
 }

src/ServiceStack.OrmLite/UntypedApi.cs

@@ -3,6 +3,7 @@
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Data;
+using System.Linq;
 
 namespace ServiceStack.OrmLite
 {
@@ -100,5 +101,10 @@ public int DeleteByIds(IEnumerable idValues)
         {
             return Exec(dbCmd => dbCmd.DeleteByIds<T>(idValues));
         }
+
+        public IEnumerable Cast(IEnumerable results)
+        {
+            return (from object result in results select (T)result).ToList();
+        }
     }
 }