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POAlternative to Using an Entity as a Parameter to an Invoke Method in WCF RIA Services
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  1. POAlternative to Using an Entity as a Parameter to an Invoke Method in WCF RIA Services
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    copied!<p>Howdy, ya'll! First question on StackOverflow! :-)</p> <p>So here's the scenario: We're working on a web app with Silverlight 4 and using WCF RIA Services 1.0 SP1 Beta for the web service. I have my entities in the Entity Framework Designer, but I'm using a slightly-modified ADO.NET C# POCO Entity Generator template to generate the classes.</p> <p>What I'd like to do is have a method inside a Domain Service with the following signature:</p> <pre><code>[EnableClientAccess] public class ResultService : DomainService { [Invoke] public SerializableResult CalculateResult(EntityOne e1, EntityTwo e2); } </code></pre> <p>I am returning both EntityOne and EntityTwo to the client through queries in other services, like so:</p> <pre><code>[EnableClientAccess] public class EntityOneService : DomainService { public IQueryable&lt;EntityOne&gt; GetEntityOnes(); } [EnableClientAccess] public class EntityOneService : DomainService { public IQueryable&lt;EntityTwo&gt; GetEntityTwos(); } </code></pre> <p>Those classes <em>are</em> successfully being generated in the Silverlight project. The SerializableResult does <em>not</em> have a key.</p> <p>When I try to compile, I get the following error: "Operation named 'CalculateResult' does not conform to the required signature. Parameter types must be an entity or complex type, a collection of complex types, or one of the predefined serializable types."</p> <p>In my research, the most helpful information I found were in the comments of <a href="http://jeffhandley.com/archive/2010/10/27/RiaServicesV1SP1Beta.aspx" rel="noreferrer">this post by Jeff Handley</a>.</p> <p>Of note, Peter asked in a comment:</p> <blockquote> <p>I get an 'does not conform to the required signature ...' compile error if my complex object has an [Key] Attribute. When I remove this attribute I can use the object as parameter for an Invoke operation.</p> </blockquote> <p>Jeff's response:</p> <blockquote> <p>This is by design. Complex objects cannot have Key properties. If you have a Key the class gets treated as an Entity.</p> </blockquote> <p>So it sounds as if any further efforts to try to get my method to work will be futile. However, I was wondering if anyone else has come across this problem, and what they did to solve it.</p> <p>Thanks very much!</p>
 

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