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POHow to reuse part of Linq to Entity Select expression in EF4.1 code only scenario
 

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  1. POHow to reuse part of Linq to Entity Select expression in EF4.1 code only scenario
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    <p>Here is very simplified version of code that i have:</p> <pre><code>class PrintJob : IEntity { public string UserName { get; set; } public string Departmen { get; set; } public int PagesPrinted { get; set; } } class PrintJobReportItem { public int TotalPagesPrinted { get; set; } public int AveragePagesPrinted { get; set; } public int PercentOfSinglePagePrintJobs { get; set; } } class PrintJobByUserReportItem : PrintJobReportItem { public string UserName { get; set; } } class PrintJobByDepartmenReportItem : PrintJobReportItem { public string DepartmentName { get; set; } public int NumberOfUsers { get; set; } } </code></pre> <p>Then i have 2 queries:</p> <pre><code>var repo = new Repository(...); var q1 = repo.GetQuery&lt;PrintJob&gt;() .GroupBy(pj =&gt; pj.UserName) .Select(g =&gt; new PrintJobByUserReportItem { #region this is PrintJobReportItem properties TotalPagesPrinted = g.Sum(p =&gt; p.PagesPrinted), AveragePagesPrinted = g.Average(p =&gt; p.PagesPrinted), PercentOfSinglePagePrintJobs = g.Count(p =&gt; p.PagesPrinted == 1) / (g.Count(p =&gt; p.PagesPrinted) != 0 ? g.Count(p =&gt; p.PagesPrinted) : 1) * 100, #endregion UserName = g.Key }); var q2 = repo.GetQuery&lt;PrintJob&gt;() .GroupBy(pj =&gt; pj.Departmen) .Select(g =&gt; new PrintJobByDepartmenReportItem { #region this is PrintJobReportItem properties TotalPagesPrinted = g.Sum(p =&gt; p.PagesPrinted), AveragePagesPrinted = g.Average(p =&gt; p.PagesPrinted), PercentOfSinglePagePrintJobs = g.Count(p =&gt; p.PagesPrinted == 1) / (g.Count(p =&gt; p.PagesPrinted) != 0 ? g.Count(p =&gt; p.PagesPrinted) : 1) * 100, #endregion DepartmentName = g.Key, NumberOfUsers = g.Select(u =&gt; u.UserName).Distinct().Count() }); </code></pre> <p>What would be suggestions for extracting parts where i assign values to TotalPagesPrinted, AveragePagesPrinted and PercentOfSinglePagePrintJobs out from those 2 queries, so that it can be reused and would follow DRY principle.</p> <p>I'm using EF 4.1 code only approach and switching to another technology or approach is not an option. Also i cannot materialize that data, i need to keep it as query, because my grid component will add more things to query later, so i can't switch to Linq to Object.</p>
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