I'm attempting to use the following code to serialize an anonymous type to JSON:

```
var serializer = new DataContractJsonSerializer(thing.GetType());
var ms = new MemoryStream();
serializer.WriteObject(ms, thing);
var json = Encoding.Default.GetString(ms.ToArray()); 

```

However, I get the following exception when this is executed:

> 
> Type
>  '<>f\_\_AnonymousType1`3[System.Int32,System.Int32,System.Object[]]'
>  cannot be serialized. Consider marking
>  it with the DataContractAttribute
>  attribute, and marking all of its
>  members you want serialized with the
>  DataMemberAttribute attribute. See
>  the Microsoft .NET Framework
>  documentation for other supported
>  types.
> 
> 
> 

I can't apply attributes to an anonymous type (as far as I know). Is there another way to do this serialization or am I missing something?