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POJSON.Net: deserializing polymorphic types without specifying the assembly
 

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  1. POJSON.Net: deserializing polymorphic types without specifying the assembly
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    <p>I see that using JSON.Net, I can decode polymorphic objects if a <code>$type</code> attribute specifies the specific type of the JSON object. In all the examples I've seen, <code>$type</code> includes the namespace. Is it possible to make this work including just a simple type name without the assembly? I'd be happy to specify a default assembly to the JsonSerializer if that's possible.</p> <p>I am able to deserialize the JSON using:</p> <pre><code>public class SingleAssemblyJsonTypeBinder : SerializationBinder { private readonly Assembly _assembly; private Dictionary&lt;string, Type&gt; _typesBySimpleName = new Dictionary&lt;string, Type&gt;(StringComparer.OrdinalIgnoreCase); private Dictionary&lt;Type,string&gt; _simpleNameByType = new Dictionary&lt;Type, string&gt;(); public SingleAssemblyJsonTypeBinder(Assembly assembly) { _assembly = assembly; _typesBySimpleName = new Dictionary&lt;string, Type&gt;(); foreach (var type in _assembly.GetTypes().Where(t =&gt; t.IsPublic)) { if (_typesBySimpleName.ContainsKey(type.Name)) throw new InvalidOperationException("Cannot user PolymorphicBinder on a namespace where multiple public types have same name."); _typesBySimpleName[type.Name] = type; _simpleNameByType[type] = type.Name; } } public override Type BindToType(string assemblyName, string typeName) { Type result; if (_typesBySimpleName.TryGetValue(typeName.Trim(), out result)) return result; return null; } public override void BindToName(Type serializedType, out string assemblyName, out string typeName) { string name; if (_simpleNameByType.TryGetValue(serializedType, out name)) { typeName = name; assemblyName = null;// _assembly.FullName; } else { typeName = null; assemblyName = null; } } } </code></pre> <p>...</p> <pre><code>public static JsonSerializerSettings GetJsonSerializationSettings() { var settings = new JsonSerializerSettings(); settings.Binder = new SingleAssemblyJsonTypeBinder(typeof(MvcApplication).Assembly); settings.TypeNameHandling = TypeNameHandling.Objects; return settings; } </code></pre> <p>...</p> <pre><code>var serializer = JsonSerializer.Create(settings); </code></pre> <p>I haven't been able to make this work with MVC though. I'm configuring JSON deserialization per the code below in <code>Application_Start</code>, and the object is deserialized, but using the base type one.</p> <pre><code>GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.Binder = new SingleAssemblyJsonTypeBinder(this.GetType().Assembly); GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = TypeNameHandling.All; GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple; </code></pre>
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