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POExpression generated based on interface
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  1. POExpression generated based on interface
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    copied!<p>I'm geting the exception <strong>Unable to cast the type 'MySomeTypeThatImplementsISomeInterfaceAndIsPassedAs[T]ToTheClass' to type 'ISomeInterface'. LINQ to Entities only supports casting Entity Data Model primitive types.</strong></p> <p>my repository looks like</p> <pre><code>public interface IRepository&lt;T&gt; { IQueryable&lt;T&gt; Get(System.Linq.Expressions.Expression&lt;System.Func&lt;T, bool&gt;&gt; Query); } </code></pre> <p>Also, I have the service class</p> <pre><code>public abstract class FinanceServiceBase&lt;TAccount, TParcel, TPayment&gt; where TAccount : IAccount where TParcel : IParcel where TPayment : IPayment { //... IRepository&lt;TPayment&gt; ParcelRepository {get; private set;} public bool MakePayment(TPayment payment) { //... ParcelRepository.Get(p =&gt; p.ParcelId == 2); // here my exception is thrown // **p.ParcelId is in IParcel** //... } } //... </code></pre> <p>With this class I can control many things about finances without rewrite code for other programs. I've did the class with 3 generic parameters because I couldn't use IRepository because my repository can't be <code>&lt;out T&gt;</code></p> <p><strong>ParcelId is Int32</strong><br/> TParcel is typeof(<em>ParcelToReceive</em>) that is an entity who implement <em>IParcel</em>, and was generated with codeonly</p> <p>The problem occurs when I call Get and the resultant lambda looks like</p> <pre><code>(**(ISomeInterface)**$p).SomeInterfaceMember == </code></pre> <p>instead of</p> <pre><code>($p.SomeInterfaceMember) </code></pre> <p>so, entity framework try do the cast and throws the exception. What I want to know is: is there anyway to tell linq that the lambda field p.ParcelId is from <strong>TParcel</strong> and not from <strong>IParcel</strong>. </p> <p>Already tried (with no luck):</p> <pre><code>p =&gt; ((TParcel)p).ParcelId </code></pre> <p>Thanks</p>
 

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