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POSelect Contains With CSV But Keep Sort Order
 

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  1. POSelect Contains With CSV But Keep Sort Order
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    <p>I have the scenario where I have a <code>IList&lt;Guid&gt;</code> in a variable called csv which are also in a specific order that I need to keep. I am then doing a select contains like so I can get back all my topics based in the list of guids I have.</p> <p>The guids are from a lucene search which are ordered by the original score from each LuceneResult. Which is why I need to keep them in this order.</p> <pre><code> var results = _context.Topic .Where(x =&gt; csv.Contains(x.Id)); </code></pre> <p>However. I lose the order the guids came in as soon as I do this. Any idea how I can do this but keep the same order I hand the list of guids to the context and get the topics back in the same order based on the topid.Id?</p> <p>I have tried the following as mentioned below, by doing a join but they still come out in the same order? Please note that I am paging these results too.</p> <pre><code> var results = _context.Topic .Join(csv, topic =&gt; topic.Id, guidFromCsv =&gt; guidFromCsv, (topic, guidFromCsv) =&gt; new { topic, guidFromCsv } ) .Where(x =&gt; x.guidFromCsv == x.topic.Id) .Skip((pageIndex - 1)*pageSize) .Take(pageSize) .Select(x=&gt; x.topic); </code></pre> <h2>** UPDATE **</h2> <p>So I have moved away from just using and guid and am attempting to pass in my lucene model which has the score property that I want to order by. Here is what I have</p> <pre><code> public PagedList&lt;Topic&gt; GetTopicsByLuceneResult(int pageIndex, int pageSize, int amountToTake, List&lt;LuceneSearchModel&gt; luceneResults) { var results = _context.Topic .Join(luceneResults, topic =&gt; topic.Id, luceneResult =&gt; luceneResult.Id, (topic, luceneResult) =&gt; new { topic, luceneResult } ) .Where(x =&gt; x.luceneResult.Id == x.topic.Id) .OrderByDescending(x =&gt; x.luceneResult.Score) .Skip((pageIndex - 1) * pageSize) .Take(pageSize) .Select(x =&gt; x.topic); var topicResults = results.ToList(); // Return a paged list return new PagedList&lt;Topic&gt;(topicResults, pageIndex, pageSize, topicResults.Count); } </code></pre> <p>However I am now getting the following error? Is what I am doing possible? </p> <p><strong>Unable to create a constant value of type 'LuceneSearchModel'. Only primitive types or enumeration types are supported in this context.</strong></p>
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    1. USleen3o
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    1. COmaybe this will help? http://stackoverflow.com/questions/8669985/linq-where-contains-keep-default-order
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    2. CO@leen3o _context.Topic.Where(x => csv.Contains(x.Id)).OrderBy(x => x.Id) - isn't it make the order you want?
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    3. COWhat is "specific order" in `IList<Guid>`? Could you set this ordering for LINQ expression?
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      1. USDennis
 

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