StackOverflow2013

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10961740
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0
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2012-06-09T14:19:47.383
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2012-06-09T14:35:37.680
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2012-06-09T14:35:37.680
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470005
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10961339
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2
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3
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text
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I think this is a nice example for <a href="http://martinfowler.com/apsupp/spec.pdf" rel="nofollow">Specification</a> usage. Create object, which will represent <code>zajezd</code> specification: <pre><code>public interface ISpecification<T> { bool IsSatisfiedBy(T value); } public class ZajezdSpecification : ISpecification<Zajezd> { private string _zeme; private string _oblast; private string _stredisko; private string _doprava; private string _strava; private int _cenaOd; private int _cenaDo; public ZajezdSpecification(string zeme, string oblast, string stredisko, string doprava, string strava, int cenaOd, int cenaDo) { _zeme = zeme; _oblast = oblast; _stredisko = stredisko; _doprava = doprava; _strava = strava; _cenaOd = cenaOd; _cenaDo = cenaDo; } public bool IsSatisfiedBy(Zajezd zajezd) { if (!String.IsNullOrEmpty(_zeme) && zajezd.Zeme != _zeme) return false; if (!String.IsNullOrEmpty(_oblast) && zajezd.Oblast != _oblast) return false; // ... verify anything you want return _cenaOd < zajezd.CenaOd && zajezd.CenaOd < _cenaDo; } } </code></pre> and initialize it with values from UI: <pre><code>ZajezdSpecification spec = new ZajezdSpecification( (string)zemeCombo.SelectedValue, (string)oblastCombo.SelectedValue, (string)strediskoCombo.SelectedValue, ... Int32.Parse(cenaDoText.Text) ); </code></pre> Use this specification to filter your collection: <pre><code>var query = from zaj in zajezdy where spec.IsSatisfiedBy(zaj) select zaj; </code></pre> PS try to use English names in your code.
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1. This table or related slice is empty.
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1. POFiltering a c# collection by multiple parameters where some may be null
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1. PTAnswer
UserLastEditorUserId
1. USSergey Berezovskiy
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1. USSergey Berezovskiy
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1. POFiltering a c# collection by multiple parameters where some may be null
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1. VO
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1. COThis is very elegant and it appears to be working all right, thank you. Sorry for the variable naming.
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 USlukfi

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