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以下是 IService1 中的 OperationContract ：

 [OperationContract]
 [WebGet(UriTemplate = "/GetStates",ResponseFormat = WebMessageFormat.Json)]
  List<string> GetStates();

Implementation of method GetStates in Service1 class :

public List<string> GetStates()
        {
            DB_MVCEntities db = new DB_MVCEntities();
           // string temp = CountryName.Country;

            string temp = "india";

            var CountryId = (from n in db.tblCountries
                             where n.Country == temp
                             select new { n.Cid }).Single();


            int ii = CountryId.Cid;

            // int ii =  (ObjectQuery<Int32>)CountryId;

            // object oo = CountryId;

            //int countryId = Convert.ToInt32(CountryId);

            var StateResult = (from n in db.tblStates
                               where n.Cid == CountryId.Cid
                               select n.StateName).ToList();

            List<string> aaa = new List<string>();

            foreach (object o in StateResult)
            {
                string t = o.ToString();
                aaa.Add(o.ToString());

            }

            return aaa;
        }

在上述方法中，我使用实体框架从数据库中获取状态列表。当我在浏览器上执行 wcf 服务时，它工作正常。意味着我得到以下输出

上述服务的输出如下：

["MH","AP"]


Code for consuming it in MVC3, Register.csheml file:

 $(document).ready(function () {

        $("#Country").change(function () {

            $.ajax({
                url: 'http://localhost:1264/Service1.svc/GetStates',
                type: 'GET',

                contentType: 'application/json; charset=utf-8',
                success: function (data) {
                    $('#State option').remove();
                    $.each(data, function (index, val) {
                        var optionTag = $('<option></option>');
                        $(optionTag).text(val.toString());

                        $('#State').append(optionTag);
                    });
                },
                error: function () {
                    alert("bye..countryes.");
                }
            });
        });
    });

当 Country 发生 Change 事件时，我得到以下输出： control is not going in Success 方法。

成功后，我将状态列表绑定到状态下拉列表。

但我无法在 mvc3 中获取 json 数据。

bye..countryes.

What was the error?
Thanks in advance.
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