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POWhy can't I use WCF DataContract and ISerializable on the same class?
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  1. POWhy can't I use WCF DataContract and ISerializable on the same class?
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    copied!<p>I have a class that I need to be able to serialize to a SQLServer session variable and be available over a WCF Service. I have declared it as follows</p> <pre><code>namespace MyNM { [Serializable] [DataContract(Name = "Foo", Namespace = "http://www.mydomain.co.uk")] public class Foo : IEntity, ISafeCopy&lt;Foo&gt; { [DataMember(Order = 0)] public virtual Guid Id { get; set; } [DataMember(Order = 1)] public virtual string a { get; set; } DataMember(Order = 2)] public virtual Bar c { get; set; } /* ISafeCopy implementation */ } [Serializable] [DataContract(Name = "Bar ", Namespace = "http://www.mydomain.co.uk")] public class Bar : IEntity, ISafeCopy&lt;Bar&gt; { #region Implementation of IEntity DataMember(Order = 0)] public virtual Guid Id { get; set; } [DataMember(Order = 1)] public virtual Baz y { get; set; } #endregion /* ISafeCopy implementation*/ } [Serializable] [DataContract] public enum Baz { [EnumMember(Value = "one")] one, [EnumMember(Value = "two")] two, [EnumMember(Value = "three")] three } </code></pre> <p>But when I try and call this service, I get the following error in the trace log.</p> <blockquote> <p>"System.Runtime.Serialization.InvalidDataContractException: Type 'BarProxybcb100e8617f40ceaa832fe4bb94533c' cannot be ISerializable and have DataContractAttribute attribute."</p> </blockquote> <p>If I take out the Serializable attribute, the WCF service works, but when the object can't be serialized to session. If I remove the DataContract attribute from class Bar, the WCF service fails saying </p> <blockquote> <p>Type 'BarProxy3bb05a31167f4ba492909ec941a54533' with data contract name 'BarProxy3bb05a31167f4ba492909ec941a54533:<a href="http://schemas.datacontract.org/2004/07/" rel="noreferrer">http://schemas.datacontract.org/2004/07/</a>' is not expected. Add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer</p> </blockquote> <p>I've tried adding a KnownType attribute to the foo class </p> <pre><code>[KnownType(typeof(Bar))] </code></pre> <p>But I still get the same error.</p> <p>Can anyone help me out with this? </p> <p>Many thanks </p> <p>Dave </p>
 

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