无法让jQuery Ajax解析JSON webservice结果

我尝试使用simple jQuery$.ajax解析结果,但是不管出于什么原因,我都无法获得正确激发和解析结果的方法,而且似乎也无法获得激发结果的函数。它们对可以返回的JSON对象的大小没有任何限制。

我还从“Site.Master”页面中删除了这段代码,因为当我点击简单的按钮时,它总是会刷新。标记与jQuery元素(如我从DOM中获取的按钮输入)是否正常工作?

function ajax() {
//var myData = { qtype: "ProductName", query: "xbox" };
var myData = { "request": { qtype: "ProductName", query: "xbox"} };
$.ajax({
    type: "POST",
    url: "/webservice/WebService.asmx/updateProductsList",
    data: {InputData:$.toJSON(myData)},
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (msg) {
        // var msg = {__type: "Testportal.outputData", id: "li1234", message: "it's work!", myInt:101}
        alert("message=" + msg.d.ProductName + ", id=" + msg.d.Brand);
    },
    error: function (res, status) {
        if (status === "error") {
            // errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
            var errorMessage = $.parseJSON(res.responseText);
            alert(errorMessage.Message);
        }
    }
});

 <asp:Button ID="Button1" runat="server" OnClientClick="ajax();"  Text="Button" /> 

以及服务器端Webmethod:

 public class WebService : System.Web.Services.WebService
{
    [WebMethod]
    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
    public OutputData updateProductsList(InputData request)
    {
        OutputData result = new OutputData();
        var db = new App_Data.eCostDataContext();
        var q = from c in db.eCosts
                select c;

        if (!string.IsNullOrEmpty(request.qtype) && !string.IsNullOrEmpty(request.query))
        {
            q = q.Like(request.qtype, request.query);
        }

        //q = q.Skip((page - 1) * rp).Take(rp);
        result.products = q.ToList();

        searchObject search = new searchObject();

        foreach (App_Data.eCost product in result.products)
        {
            /* create new item list */
            searchResult elements = new searchResult()
            {
                id = product.ProductID,
                elements = GetPropertyList(product)
            };
            search.items.Add(elements);
        }
        return result;

    }

和助手类:

    public class OutputData
{
    public string id { get; set; }
    public List<App_Data.eCost> products { get; set; }

}
public class InputData
{
    public string qtype { get; set; }
    public string query { get; set; }
}