Question

我有一个支持WCF AJAX的Web服务，我试图通过JSON将ASP.NET页面中的字段值传递给它，但我总是得不到任何东西。我想做的事情就像我们在ASP.NET Web服务中所做的那样：

的request.form（＆＃34; SBID＆＃34）的toString（）;

我的Web服务正在获取一个NULL参数，我认为这是因为我在表单中传递的内容。 Web服务是：

[OperationContract]
        [WebGet]
        public ResultData GetContactsDataAndCountbyGUID(string requestGUID)
        {
            ResultData result = new ResultData();
            common c = new common();

            string request = String.Empty;
            try
            {
                request = OperationContext.Current.RequestContext.RequestMessage.ToString();

            }
            catch (Exception ex)
            {

            }

            try
            {
                List<CONTACT> listContacts = new List<CONTACT>();

                DataSet ds = new DataSet();
                ds = c.GetDataSet(requestGUID);
                DataTable dt = new DataTable();
                dt = ds.Tables[0];

                // listContacts = CollectionHelper.ConvertTo<CONTACT>(dt);

                listContacts = c.ConvertTo<CONTACT>(dt);

                result.Data = listContacts;
                result.Count = listContacts.Count;

           }

这是JavaScript / jQuery：

  <script type="text/javascript">
            //function DoUpdate(sbiId) {
            //    var input = '{"SbiId":"' + sbiId + '"}';
            //    var dataSource;
        $(document).ready(function() {
            **var input ='{"SbiId":"<%=guid %>"}';**
            $.ajax({
                url: "http://www.blah.com/services/testsService.svc/GetContactsDataAndCountbyGUID",
                type: "GET",
                contentType: "application/json; charset=utf-8",
                data: input,
                dataType: "json",
                success: function(data) {
                    var mtv = $find("<%= RadGrid1.ClientID %>").get_masterTableView();
                    console.log(data);
                    mtv.set_dataSource(data.d.Data);
                    mtv.dataBind();
                }
            });
            // }

        });
        </script>

我正在尝试传递GUID的值，其形式为：

public string guid = null;
        common c = new common();
        protected void Page_Load(object sender, EventArgs e)
        {
             try
            {

                IHubContext hubContext = GlobalHost.ConnectionManager.GetHubContext<AlphaHub>();
                // common c = new common();
                var userManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
                ApplicationUser user = userManager.FindByNameAsync(User.Identity.Name).Result;
                string connectionId =  c.GetCurrentConnection(user.RegistrationCode);       

                string request = "Contact" + " - " + connectionId + " - " + user.RegistrationCode;
                string guid = c.recordDataRequest(user.RegistrationCode, request, connectionId, "out", "");
                request = request + " - " + guid;
                hubContext.Clients.Client(connectionId).CallForReport(request);  
           //   hub
                Thread.Sleep(1000);
            }

如何传入并检索此值？

Answer 1

ASP.Net是无状态的，您无法从后面的代码中访问变量。将它存储在一个隐藏变量中，您可以从jQuery访问它。

<input type="hidden" id="hdnGuid" runat="server">

在你的代码中设置它：

string guid = c.recordDataRequest(user.RegistrationCode, request, connectionId, "out", "");
hdnGuid.Value = guid;

在你的jQuery中访问它：

var hdnGuid = $("#<%= hdnGuid.ClientID %>").val();
var input ='{"SbiId":"' + hdnGuid + '"}';

如何访问ASP.NET变量以作为JSON字符串传递给WCF Ajax Enabled Service

1 个答案: