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I have a struct in C# that wraps a guid. I'm using DataContractJsonSerializer to serialize an object containing an instance of that class. When I was using a guid directly, it was serialized as a plain string, but now it's serialized as a name/value pair. Here's an NUnit test and supporting code that demonstrates the problem: private static string ToJson<T>(T data) { DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof (T)); using (MemoryStream ms = new MemoryStream()) { serializer.WriteObject(ms, data); return Encoding.Default.GetString(ms.ToArray()); } } [Serializable] private class ID { private Guid _value; public static explicit operator ID(Guid id) { return new ID { _value = id }; } public static explicit operator Guid(ID id) { return id._value; } } [Test] public void IDShouldSerializeLikeGuid() { Guid guid = Guid.NewGuid(); ID id = (ID) guid; Assert.That(ToJson(id), Is.EqualTo(ToJson(guid))); } And the test runner output: NUnit.Framework.AssertionException: Expected string length 38 but was 49. Strings differ at index 0. Expected: ""7511fb9f-3515-4e95-9a04-06580753527d"" But was: "{"_value":"7511fb9f-3515-4e95-9a04-06580753527d"}" -----------^ How do I serialize my struct as a plain string and make my test pass?

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