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    copied!<p>Web .Config</p> <pre><code>&lt;applicationSettings&gt; &lt;HostProcess.Properties.Settings&gt; &lt;setting name="KnowTypes" serializeAs="Xml"&gt; &lt;value&gt; &lt;ArrayOfString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; &lt;string&gt;a.AOrder,a&lt;/string&gt; &lt;string&gt;b.BOrder,b&lt;/string&gt; &lt;string&gt;c.COrder,c&lt;/string&gt; &lt;/ArrayOfString&gt; &lt;/value&gt; &lt;/setting&gt; &lt;/HostProcess.Properties.Settings&gt; </code></pre> <p></p> <pre><code>static class Helper { public static IEnumerable&lt;Type&gt; GetKnownTypes(ICustomAttributeProvider provider) { System.Collections.Generic.List&lt;System.Type&gt; knownTypes = new System.Collections.Generic.List&lt;System.Type&gt;(); // Add any types to include here. Properties.Settings.Default.KnowTypes.Cast&lt;string&gt;().ToList().ForEach(type =&gt; { knownTypes.Add(Type.GetType(type)); }); return knownTypes; } } [ServiceContract] [ServiceKnownType("GetKnownTypes", typeof(Helper))] public interface IOrderProcessor { [OperationContract] string ProcessOrder(Order order); } </code></pre> <hr> <p>The Order is the abstract base class </p> <hr> <pre><code>[DataContract] public abstract class Order { public Order() { OrderDate = DateTime.Now; } [DataMember] public string OrderID { get; set; } [DataMember] public DateTime OrderDate { get; set; } [DataMember] public string FirstName { get; set; } [DataMember] public string LastName { get; set; } } </code></pre>
 

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