Question

With the following code how do I get a return that includes any of zip list but only records that have a purpose of street address? This currently returns matches for either the zip or the street address.

var zipPredicate = PredicateBuilder.False<NameAddress>();
        List<string> zips = new List<string>();
        zips.Add("90210");
        zips.Add("90211");
        foreach (var item in zips)
        {
            zipPredicate = zipPredicate.Or(n=> n.ZIP.Contains(item));        
        }
            zipPredicate = zipPredicate.And(n=> n.Purpose=="Street Address");        
        var zipResult = from s in NameAddresses 
        .AsExpandable()
        .Where(zipPredicate)
        select new{s.ID, s.ZIP, s.Purpose};

zipResult.Dump();

Answer 1

I think what you are looking for is:

var zipPredicate = PredicateBuilder.False<NameAddress>();
    List<string> zips = new List<string>();
    zips.Add("90210");
    zips.Add("90211");
    foreach (var item in zips)
    {
        zipPredicate = zipPredicate.Or(n=> n.ZIP.Contains(item) && n.Purpose=="Street Address");        
    }        
    var zipResult = from s in NameAddresses 
    .AsExpandable()
    .Where(zipPredicate)
    select new{s.ID, s.ZIP, s.Purpose};

zipResult.Dump();

EDIT

One more thing as well, if you want to drop building up the predicate, you should be able to do something like: .Where(n=>zips.Contains(n.ZIP) && n.Purpose=="Street Address") The important piece is that your entity property component comes inside the .Contains(). This would shorten your code to:

    List<string> zips = new List<string>();
    zips.Add("90210");
    zips.Add("90211");

    var zipResult = from s in NameAddresses 
    .AsExpandable()
    .Where(n=>zips.Contains(n.ZIP) && n.Purpose=="Street Address")
    select new{s.ID, s.ZIP, s.Purpose};

zipResult.Dump();

Which I like better for readability. I would expect the query that ends up getting executed is the same either way.