predicatebuilder

I'm using PredicateBuilder to build a query against a List of Umbraco Nodes to filter search results. I have the searched ID value coming through as a String via the QueryString which I then compare to a string field on each of the Umbraco Nodes in the list to get matches. Currently, the code does the match against the target field in there is a value in the Query String which works fine. I need to add a conditional inside my .And() that tries to match the QS against the field String if the field has a value, but if the field has no value, then it should match that as well. if (!string

I am using predicate builder to write the following code: IEnumerable<int> ids= new List<int> { 47, 48 }; var predicate = PredicateBuilder.False<Customer>(); predicate = predicate.And(x => x.CreatedAt >= fromDate && x.CreatedAt <= toDate); foreach (var id in ids) { predicate = predicate.Or(x => x.Source.Id == id); } var result = Database.Set<Customer>().AsExpandable() .Where(predicate) .ToList(); The SQL generated looks like (just the WHERE clause): WHERE ([Filter6].[SourceId] IN (@p__linq__0,@p__linq__1)) AND ([Filter6].[CreatedAt] >= @p__linq__2) AND ([Filter6].[CreatedAt] <= @p__linq__3)',

I have sitecore pages / lucene documents with the following fields: Title Filename Content File Contents I'm creating a search for these and have the following requirements: Hits containing the whole phrase in the title field should be returned first. Hits containing the whole phrase in the filename field should be returned second. Hits containing the whole phrase in the content should be returned third Hits containing the whole phrase in the file contents should be returned fourth Hits containing all of the keywords (in any order) in the title field should be returned fifth Hits containing

Here's the scenario: Silverlight 4.0, DataGrid, PagedCollectionView itemssource. The objective is to apply a Filter to the PCV. The filter needs to be a Predicate<object>(Method) - where Method implements some logic against the object and returns true/false for inclusion. What I have is a need to optionally include 3 different criteria in the filter logic and explicit code quickly gets ugly. We don't want that, do we? So I see that there is a way to build an expression tree using PredicateBuilder and pass that into Linq.Where, a la: IQueryable<Product> SearchProducts (params string[] keywords)

A Party can have one or more Contact objects. I want to select all Parties who's streetname contains a specific keyword. If I just want to search in Party I can use the code below. But how do I extend it to also search in Contact ? public IQueryable<Party> SearchParties(List<string> keywords) { var predicate = PredicateBuilder.False<Party>(); foreach (string word in keywords) { var keyword = word; predicate = predicate.Or(p => p.surname.Contains(keyword)); predicate = predicate.Or(p => p.lastname.Contains(keyword)); predicate = predicate.Or(p => p.number.Contains(keyword)); } return db.Parties

Im using the PredicateBuilder as seen here http://www.albahari.com/nutshell/predicatebuilder.aspx , everything works great, and now i can genrate Dynamic LINQ to SQL expressions, but the thing that i dont understand is why when i am on a loop like this: var inner = PredicateBuilder.False<MyType>(); foreach (var f in Filtermodel.InstrumentsFilterList.Where(s => s.isActive)) { int temp = f.InstrumentID; inner = inner.Or(ud => ud.InstrumentId == temp); } Why must i use that temp variable?, i try to use the "f" iterator variable but it only get the last value on the list for each iteration, like