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linq lambda select save into custom class object

The simplest approach here is to fetch into an anonymous type and then do the rest in-process via AsEnumerable:

return (from p in _db.P
        join t in _db.TP on p.Id equals t.PId
        select new { t.PId, t.Id }).AsEnumerable()
       .Select(x => new TPE { PId = x.PId, TId = x.Id })
       .ToList();

Or all in extension method syntax:

return _db.P.Join(_db.TP, p => p.Id, t => t.PId,
                 (p, t) =>  new { t.PId, t.Id })
            .AsEnumerable()
            .Select(x => new TPE { PId = x.PId, TId = x.Id })
            .ToList();

Resources:https://stackoverflow.com/questions/7013189/linq-query-cant-select-data-into-a-custom-class-object