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POHow to Customize Deserialization of a JSON enum in .NET?
 

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  1. POHow to Customize Deserialization of a JSON enum in .NET?
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    <p>I have the following sample C# code that is auto-genereated from an xsd using the svcutils.exe application.</p> <pre><code> [DataContract] public enum Foo { [EnumMember(Value = "bar")] Bar = 1, [EnumMember(Value = "baz")] Baz = 2 } [DataContract] public class UNameIt { [DataMember(Name = "id")] public long Id { get; private set; } [DataMember(Name = "name")] public string Name { get; private set; } [DataMember(Name = "foo")] public Foo Foo { get; private set; } } </code></pre> <p>The following is a unit test that attempts to deserialise a sample JSON document to the UNameIt class. </p> <pre><code> [TestClass] public class JsonSerializer_Fixture { public const string JsonData = @"{ ""id"":123456, ""name"":""John Doe"", ""foo"":""Bar""}"; [TestMethod] public void DataObjectSimpleParseTest() { DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(UNameIt)); MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(JsonData)); UNameIt dataObject = serializer.ReadObject(ms) as UNameIt; Assert.IsNotNull(dataObject); Assert.AreEqual(123456, dataObject.Id); Assert.AreEqual(Foo.Baz, dataObject.Foo); } } </code></pre> <p>Unfortunately, the test fails giving the following reason:</p> <blockquote> <p>System.Runtime.Serialization.SerializationException: There was an error deserializing the object of type MyNamespace.Units.UNameIt. The value 'Bar' cannot be parsed as the type 'Int64'.</p> </blockquote> <p>The test will pass if I update my JSON string to replace the string specifier for the Enum to an integer e.g.</p> <pre><code>public const string JsonData = @"{ ""id"":123456, ""name"":""John Doe"", ""foo"":""1""}"; </code></pre> <p>I do not have the flexibility to the change the supplied JSON so I have to figure out how to convert the string Enum representation perhaps on serialisation. Ideally, I would like to facilitate this without having to change my autogenerate class because once I re-generate the class I would loose my changes. </p> <p>I am wondering if it would be possible to extend the DataContractJsonSerializer to custom handle Enumerations? Or perhaps there is better way to do this?</p>
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    1. USAjay
    1. USuser989046
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      1. POHow to Customize Deserialization of a JSON enum in .NET?
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      1. POHow to Customize Deserialization of a JSON enum in .NET?
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    1. COHave you tried to remove the 'private' modifier on the set method of class UNameIt? And try your test writing "bar" lowercase...
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      1. POHow to Customize Deserialization of a JSON enum in .NET?
      1. USMax Zerbini
    2. COit's recommended to avoid expose enums in wcf data contracts because they create subtle backwards compatible problems. See http://stackoverflow.com/a/788281/52277
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      1. USMichael Freidgeim
 

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