patch by matt...@amigarulez.se, Some grids active/Telerik and other edge...

patch by  matt...@amigarulez.se, Some grids active/Telerik and other edge cases use reflection and other methods to cache members.

Current implementation results in inconsistent between the wrapper object and the underlying dictionary because the DynamicObject members are returned and not the underlying dictionary.

Simple fix basically add an override to FastExpando class and reflection acts consistently.

Dapper/SqlMapper.cs

@@ -831,6 +831,11 @@ public override bool TryGetMember(System.Dynamic.GetMemberBinder binder, out obj
                 return data.TryGetValue(binder.Name, out result);
             }
 
+            public override IEnumerable<string> GetDynamicMemberNames()
+            {
+	            return data.Keys;
+            }
+
             #region IDictionary<string,object> Members
 
             void IDictionary<string, object>.Add(string key, object value)
@@ -870,9 +875,13 @@ public override bool TryGetMember(System.Dynamic.GetMemberBinder binder, out obj
                     return data[key];
                 }
                 set
+                {
+                    if (!data.ContainsKey(key)) 
                     {
 	                    throw new NotImplementedException();
                     }
+                    data[key] = value;
+                }
             }
 
             #endregion