如何在asp.NETWebForm的jQueryAjax中使用c#datatable？

伙计们，我想把一个数据表从c#发送到jQueryAjax。如果我发送字符串，它工作正常，如果我发送数据表，它会给出下面我发布的输出错误

[WebMethod]
            public static DataTable getGuestByGuestIDFront(string guest_id)
            {

                DataTable dt621 = BAL.getGuestByGuestID(guest_id);
                return dt621;
            }

Jquery

  < script type = "text/javascript" >

 function guest_search() {
     //      debugger;
     var guest_id = $('#guest_id').val();
     jQuery.ajax({
         url: 'Walkin6.aspx/getGuestByGuestIDFront',
         type: "POST",
         data: "{'guest_id':" + guest_id + "}",
         contentType: "application/json; charset=utf-8",
         dataType: "json",
         success: function (data) {
             debugger;
             // TabItem2_click();
             console.log(data.d);
             //   alert("Booking ID " + data.d);
             // $("#message").html((data.d));

             //   $(this).prop("disabled", true);

         },
         error: function (result) {
             console.log('Failed' + result.responseText);
         }

     });
 } < /script>

这就是输出

失败{“Message”：“序列化类型为\u0027System.Reflection.RuntimeModule\u0027的对象时检测到循环引用。”，“StackTrace”：“at System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal”（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationCustomObject（对象o、StringBuilder sb、Int32深度、哈希表Object正弦、SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationEnumerable（IEnumerable enumerable，StringBuilder sb，Int32 depth，Hashtable ObjectsUse，SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationCustomObject（对象o、StringBuilder sb、Int32深度、哈希表Object正弦、SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationCustomObject（对象o、StringBuilder sb、Int32深度、哈希表Object正弦、SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationCustomObject（对象o、StringBuilder sb、Int32深度、哈希表Object正弦、SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationCustomObject（对象o、StringBuilder sb、Int32深度、哈希表Object正弦、SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationEnumerable（IEnumerable enumerable，StringBuilder sb，Int32 depth，Hashtable ObjectsUse，SerializationFormat SerializationFormat）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValueInternal（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.Script.Serialization.JavaScriptSerializer.SerializationValue（对象o、StringBuilder sb、Int32深度、哈希表对象正弦、SerializationFormat SerializationFormat、MemberInfo currentMember）\r\n位于System.Web.S

[WebMethod]
public static string doSomething(int id)
{
   DataTable dt621 = BAL.getGuestByGuestID(guest_id);

   return JsonConvert.SerializeObject(dt621);
}

 success: function (data) {

    var tableData = $.parseJSON(data.d);//if you want your data in json
  }

  [WebMethod]
        public static string getGuestByGuestIDFront(string guest_id)
        {
            DataTable dt = BAL.getGuestByGuestID(guest_id);

            List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
            Dictionary<string, object> row = null;

            foreach (DataRow dr in dt.Rows)
            {
                row = new Dictionary<string, object>();
                foreach (DataColumn col in dt.Columns)
                {
                    row.Add(col.ColumnName, dr[col]);
                }
                rows.Add(row);
            }

            string json = js.Serialize(rows);
            return json;
        }

 success: function (serverdata) {

    var tableData = $.parseJSON(serverdata.d);
  }