WCF + Json = wrong serialization

Question

Why this WCF 3.5 method

[ServiceContract]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class Json
{
    [OperationContract]
    [WebGet(ResponseFormat = WebMessageFormat.Json)]
    public string Upper(string text)
    {
        return text.ToUpper();
    }
}

returns {"d":"TEXT"} ?

It should returns {"TEXT"}

I'm calling using jQuery.

    $("#upper").click(function() {
        $.ajax({
            type: "GET",
            url: "/Json.svc/Upper?text="+$("#input1").val(),
            success: function(data) {
                $("#input1").val(data.d);
            }
        });
    });

Answer 1

Have you tried changing the BodyStyle property of your [WebGet] Attribute so that responses aren't wrapped?

Answer 2

This is a security feature that has been added to the JSON serialization in .NET 3.5. It's a container object, so instead of, say, results[0], you would just say results.d[0]. Read this article for more information.