This sounded like the perfect solution.
But unfortunately RIA crashes
*"Nested query expressions are not supported"*
-David Burela
On 6 September 2010 16:41, Peter Gfader <pe...@gfader.com> wrote:
> 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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