I am doing some complex linq querying and a lot of the queries rely on MNTP2.

After reading about Umbraco performance, I am concerned that I am doing a lot of comparisons using IPublishedContent vs just string ids for example. The idea being that every time an IPublishedContent is created, there is memory allocation to this. Instead of returning a list of IPublishedContent for MNTP2 is there a way to just get a comma delimited string back instead of a bunch of IPublishedContents?

For example, instead of this:

var blacklist = Model.Content.GetPropertyValue<IEnumerable<IPublishedContent>>("exclusionList")

I want something like:

var blacklist = Model.Content.GetPropertyValue<string>("exclusionList")

When I just use <string> I get:

System.Collections.Generic.List`1[Umbraco.Core.Models.IPublishedContent] returned....

I have tried doing something like this:

 var blacklist = Model.Content.GetPropertyValue<IEnumerable<IPublishedContent>>("exclusionList").Select(x => x.Id).ToList<int>();

But it defeats the purpose as the IPublishedContent is still created and persisted to memory.

Any thoughts appreciated.

Jamie