How to set Json.NET ContractSerializer for a certain specific type instead of globally?

I want to set a contract serializer just for certain types in my ASP.NET Web API application. I can set the settings globally in the App_Start/FormatterConfig.cs like this:

public static void RegisterGlobalFormatters(MediaTypeFormatterCollection formatters)
{
    jsonSerializerSettings.ContractResolver = new CriteriaContractResolver(new List<string>(new string[]{"mdData", "name", "label"})); 

...

but how can I just apply this to one or more specific class types?

The reason I want to do this is because I need to be able to set what fields should be serialized at runtime based on configuration or parameters to the web service similar to these examples:

Using JSON.net, how do I prevent serializing properties of a derived class, when used in a base class context?

http://json.codeplex.com/discussions/347610