Filtering lists using LINQ

Question

I\'ve got a list of People that are returned from an external app and I\'m creating an exclusion list in my local app to give me the option of manually removing people from the

Answer 1

This LINQ below will generate the SQL for a left outer join and then take all of the results that don't find a match in your exclusion list.

List filteredResults =from p in people
        join e in exclusions on p.compositeKey equals e.compositeKey into temp
        from t in temp.DefaultIfEmpty()
        where t.compositeKey == null
        select p

let me know if it works!