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POWCF Client having problems recognizing ServiceKnownTypes?
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  1. POWCF Client having problems recognizing ServiceKnownTypes?
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    copied!<p>How would I tell the WCF service what KnownTypes to use when passing data back to the client?</p> <p>I know I can use the <code>[ServiceKnownType]</code> attribute, which makes the service call run fine from a WCF Test Server, however it still fails from the client. Am I missing something here?</p> <pre><code>[OperationContract] [ServiceKnownType(typeof(SubClassA))] [ServiceKnownType(typeof(SubClassB))] BaseClassZ GetObject(); </code></pre> <p>Error message from client is:</p> <blockquote> <p>{"Element 'http://schemas.datacontract.org/2004/07/BaseClassZ' contains data from a type that maps to the name 'http://schemas.datacontract.org/2004/07/SubClassA'. The deserializer has no knowledge of any type that maps to this name. Consider using a DataContractResolver or add the type corresponding to 'SubClassA' to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding it to the list of known types passed to DataContractSerializer."}</p> </blockquote> <p>Serializing/Deserializing the object on the WCF server using a DataContractSerializer and a list of KnownTypes works fine.</p> <p><strong>UPDATE:</strong> It appears I can get the client to read the object correctly if I add KnownType attributes to the base class, but I am still looking for a way around this if possible since the base class is used for a lot of items and I don't want to have to modify the KnownType attributes on the base class anytime I add a new item.</p> <pre><code>[DataContract] [KnownType(typeof(SubClassA))] [KnownType(typeof(SubClassB))] public class BaseClassZ { ... } </code></pre>
 

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