Hi David
Check out the PredicateBuilder from J. Albahiri ("Nesting Predicates")
Source here
http://www.albahari.com/nutshell/predicatebuilder.aspx
<http://www.albahari.com/nutshell/predicatebuilder.aspx>.peter.gfader.
http://blog.gfader.com/
http://twitter.com/peitor
On Mon, Sep 6, 2010 at 4:15 PM, David Burela <david.bur...@gmail.com> wrote:
> This seems like a simple problem but I am stumped.
>
> I have a screen with a number of filters. In one instance I have checkboxes
> of countries (Australia, China, Japan, etc).
> I want to filter to only show products that are located in the checked
> countries. So products listed in Australia OR in China OR in Japan.
>
> My issue is that the RIA servies query object, only lets you chain up ANDs
>
> var query = ProductDomainContext.ProductSelectQuery();
> if(AustraliaIsSelected)
> query = query.Where(p => p.Country == "Australia");
> if(ChinaIsSelected)
> query = query.Where(p => p.Country == "China");
>
> Doing it this way will end up with a query where the country is Australia
> AND China.
> I was hoping I could go
>
>
> var checkedCountries = new []{"Australia", "China"};
> query = query.Where(p => checkedCountries.Contains(p.Country)
>
> But RIA complains that it does not support the contains operation.
> Any ideas?
>
> -David Burela
>
>
>
> P.S.
> I can't do it on one line like this
>
> query.Where(p => p.Country=="Australia" || p.Country == "China");
>
> Because at runtime I don't know how many are there. The above is just a
> simplified example
>
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>
--
.peter.gfader.
http://blog.gfader.com/
http://twitter.com/peitor
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