C# reflection problem - please help

Hi, please help me understand what's going on in here and whether it should work like that ? I have a generic list of objects from a CMS:

For example List<MyCMS.Articles.Article> myArticles = articles.All;

Later I output the contents of the list in a JSON format (for CMS UI - table list).

Now a single record would include:

        MyCms.Content.Games games = new MyCms.Content.Games();
        List<MyCms.Content.Games.Game> allGames = games.All;

        MyCms.Content.Games games2 = new MyCms.Content.Games();
        List<MyCms.Content.Games.Game> allGamesOther = games2.All;

        Response.Write("Total games: " + allGames.Count + "<br />");

        //This is our fields stripper - with result assigned to a new list
        List<MyCms.Content.Games.Game> completelyUnrelatedOtherIsolated_but_notSureList = RemoveUnusedFields(allGamesOther);

        List<MyCms.Content.Games.Game> gamesFiltered = allGames.Where(g=>g.GamingProperties.Software=="89070ef9-e115-4907-9996-6421e6013993").ToList();

        Response.Write("Filtered games: " + gamesFiltered.Count + "<br /><br />");

    }

    private List<MyCms.Content.Games.Game> RemoveUnusedFields(List<MyCms.Content.Games.Game> games)
    {
        List<MyCms.Content.Games.Game> result = new List<MyCms.Content.Games.Game>();

        if (games != null && games.Count > 0)
        {
            //Retrieve a list of current object properties
            List<string> myContentProperties = MyCms.Utils.GetContentProperties(games[0]);

            //      Response.Write("<br /><span style=color:green>" + string.Join("<br />", myContentProperties.ToArray()) + "</span><br />");

            MyCms.PropertyReflector pF = new MyCms.PropertyReflector();

            foreach (MyCms.Content.Games.Game contentItem in games)
            {
                MyCms.Content.Games.Game myNewGame = (MyCms.Content.Games.Game)contentItem.Clone();
                myNewGame.Images = "wtf!";

                pF.SetValue(myNewGame, "GamingProperties.Software", "");

                result.Add(myNewGame);
             
            }
        }

        return result;
    }

Code (markup):

etc...

as you can see an Article object has an additional class property - with common properties (used on other object types in the CMS)

I also use a filter class that does some filter operations with LINQ on the collection to return me only articles within a certain channel, for example...

So the problem is that when I serialize the collection as JSON - there are only a few "columns" that I really need to display in my table list, while I have no need in other fields - especially, possibly long fields such as "description" (lazy loaded from file system), etc... - I serialize with DataContractJsonSerializer...

I need a way to control what fields will be included in the JSON result... What I do is I use reflection to set property values to null if I don't need the property and decorate class properties with [DataMember(IsRequired = false, EmitDefaultValue = false)] attributes... - it should work well - but - as soon as I go over (even cloned!!) collection of final objects to strip off the fields = set value to "null" - property value becomes null - application wide - in all collections of such objects... eh ?

 

problem solved,
i needed to deep clone the classes.