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POGeneralizing the column name in linq.Where or .OrderBy
 

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    <p>I have a "manager" class with a number of sub-classes. I find one particular method being duplicated in all or almost all of the sub-classes, so I want to generalize it. In one case, it looks like this:</p> <pre><code> var Results = from j in Job.All( ) where guids.Contains( j.JobID ) orderby j.JobNumber select j; </code></pre> <p>I am using SubSonic, so Job.All( ) is a static method that returns an <code>IQueryable&lt;Job&gt;</code>. guids is an <code>IEnumerable&lt;Guid&gt;</code> which holds a list of keys into the Job table. My final result is a SQL query with WHERE Job.JobID IN (x, y, z).</p> <p>What I'm looking for is a way to call a method like this where I pass in guids, "Job", "JobID" and "JobNumber" so that I can plug them into the appropriate places.</p> <p>There is a limit to the number of parameters a SQL IN clause can handle, so my general method would also check guids.Count and code a little bit different query when it exceeded a certain number (say, 2000). This code is also in all the sub-classes.</p> <p>Note: I have no objection to using the lambda-style notation. This is my first cut, which has problems with "T.All( )", and item.???:</p> <pre><code> const int MAX_ITEMS = 2000; public List&lt;T&gt; GetFromList&lt;T&gt;( List&lt;Guid&gt; _IDs ) where T : class, IActiveRecord { List&lt;T&gt; rc; if ( MAX_ITEMS &gt; _IDs.Count ) { var Results = from item in T.All( ) where _IDs.Contains( item.??? ) orderby item.??? select item; rc = Results.ToList&lt;T&gt;( ); } else // too many for IN clause { var Results = from id in _IDs join item in T.All( ) on id equals item.??? orderby item.??? select item; rc = Results.ToList&lt;T&gt;( ); } return rc; } </code></pre>
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