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POHow can I use CompiledQuery
 

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  1. POHow can I use CompiledQuery
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    <p>I used the linq to fetch the data from database before, but it looks like using CompiledQuery with Linq should be than using Linq by itself.</p> <p>I've try to use CompiledQuery, but it's throwing an exception.</p> <p>Following is my code:</p> <pre><code>static readonly Func&lt;myEntity, int?, List&lt;myDataModel&gt;&gt; s_compiledQuery2 = CompiledQuery.Compile&lt;myEntity, int?, List&lt;myDataModel&gt;&gt; ( (ctx, NULLUserId) =&gt; ( from jlr in ctx.C_InternetCafe where jlr.USER_ID != NULLUserId select new myDataModel { pid = jlr.PC_ID ?? 0, uid= jlr.USER_ID ?? 0 } ).ToList() ); static List&lt;myDataModel&gt; CompiledQuery2() { using (myEntity context = new myEntity()) { int? UserId = null; List&lt;myDataModel&gt; orders = s_compiledQuery2.Invoke(context, UserId); return orders; } } public List&lt;myDataModel&gt; getCustomerInf() { return CompiledQuery2(); } </code></pre> <p>I just want to fetch the values "PC_ID" and "USER_ID" from table <code>C_InternetCafe</code>, and add them to myDataModel whose datamember has <code>pid</code> and <code>uid</code>.</p> <p>//----------------------------------------------------------------------------</p> <p>Forgive my negligence, the following are the exception I got.</p> <pre><code>NotSupportedException { "LINQ to Entities does not recognize the method 'System.Collections.Generic.List`1 [InternetCafeManager.Web.DataModel.myDataModel] ToList[myDataModel] (System.Collections.Generic.IEnumerable`1 [InternetCafeManager.Web.DataModel.myDataModel])' method, and this method cannot be translated into a store expression" } </code></pre>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser1531714
    1. USuser1531714
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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    1. VO
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      1. POHow can I use CompiledQuery
      1. This table or related slice is empty.
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    1. COWhat's the error? The first thing I'd suggest is to remove **ToList** from the compiled query body.
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      1. POHow can I use CompiledQuery
      1. USMcGarnagle
 

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