Pass and get object with ASMX WebService

We have a web service like this:

[WebMethod(EnableSession = true)]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public object[] DoSmt(object[] inParams)
{
    List<object> rsl = new List<object>();
    rsl.Add(DateTime.Now);
    rsl.Add(new CallResult());
    return rsl.ToArray();
}

CallResult class is defined in web service. We call this method from WinForms (before that we add a web reference to this web service):

Service svc = new Service();
object[] arrRsl = svc.DoSmt(new object[] { "hi there", "hello" });

We get an exception says

App do not know how to deserialize CallResult

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But if we put a funny function like this into the web service:

[WebMethod(EnableSession = true)]
public void Fun(CallResult abc)
{
    // Do nothing
}

then everything is ok. It is because CallResult does not appear in WSDL file before adding of funny function because it does not appear in any WebMethod.

The question is: How to inform C# to generate CallResult in WSDL file even if it does not explicitly be used in any WebMethod. We use VS2005.

Thanks.

---

You can mark the class with the GenerateScriptTypeAttribute.

In some cases, even if the type corresponds to an input parameter or return value of a Web service method, the proxy will not be generated automatically. In that case, you must use the GenerateScriptTypeAttribute attribute to generate the proxy object for the type.

[GenerateScriptType(typeof(ColorObject), ScriptTypeId = "Color")]
[WebMethod]
public string[] GetDefaultColor()
{
    // Instantiate the default color object.
    ColorObject co = new ColorObject();

    return co.rgb;
}