如何在asp.net webform中的jquery ajax中使用c＃datatable？

Question

伙计们我想从c＃向jquery Ajax发送数据表。 如果我发送字符串它正常工作，如果我发送数据，它给出输出错误下面我已发布！

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

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

jQuery的

  < 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>

这是输出！

失败{“消息”：“在序列化类型为\\ u0027System.Reflection.RuntimeModule \\ u0027的对象时检测到循环引用。”，“StackTrace”：“在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal（Object o， StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember） \\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.Serialize.VavaScript.Serialization.VavaScript.SerializeVerialueInternal（Object）中的System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat）\\ r \\ n o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n在System.Web.Script.Seria上 lization.JavaScriptSerializer.SerializeValue（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeEnumerable（IEnumerable enumerable，StringBuilder sb，Int32 depth，哈希表objectsInUse，serializationFormat serializationFormat个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，serializationFormat serializationFormat，的MemberInfo currentMember个）\\ r \\ n在System.Web程序。 Script.Serialization.JavaScriptSerializer.SerializeValue（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，SerializationFormat serializationFormat，的MemberInfo currentMember个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject（对象O，StringBuilder的SB，的Int32在系统中，深度，Hashtable objectsInUse，SerializationFormat serializationFormat）\\ r \\ n .Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，SerializationFormat serializationFormat，的MemberInfo currentMember个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，SerializationFormat serializationFormat，的MemberInfo currentMember个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，SerializationFormat serializationFormat个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，serializationFormat serializationFormat，的MemberInfo currentMember个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue（对象O ，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberI nfo currentMember）\\ r \\ n在System.Web.Script.Serialization.Iv.P.对于System.Web.Script.Serial化处理过程中的System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat）\\ r \\ n。 SerializeValueInternal（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat）在System.Web.Script.Serialization的System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat）\\ r \\ n中的serializationFormat，MemberInfo currentMember）\\ r \\ n。 JavaScriptSerializer.SerializeValueInternal（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFo 在System.Web.Script.Script上的System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n中的rmat，MemberInfo currentMember）\\ r \\ n .Serialization.JavaScriptSerializer.SerializeEnumerable（IEnumerable enumerable，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse） ，System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n在System.Web上的，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n .Script.Serialization.JavaScriptSerializer.SerializeCustomObject（Object o，StringBuilder sb，Int32 depth，Hashtable object sInUse，SerializationFormat serializationFormat个）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal（对象O，StringBuilder的SB，深度Int，哈希表objectsInUse，SerializationFormat serializationFormat，的MemberInfo currentMember个）\\ r \\ n在System.Web.Script .Serialization.JavaScriptSerializer.SerializeValue（Object o，StringBuilder sb，Int32 depth，Hashtable objectsInUse，SerializationFormat serializationFormat，MemberInfo currentMember）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.Serialize（Object obj，StringBuilder输出，SerializationFormat serializationFormat） ）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.Serialize（Object obj，SerializationFormat serializationFormat）\\ r \\ n在System.Web.Script.Serialization.JavaScriptSerializer.Serialize（Object obj）\\ r \\ n at System System.Web.Script.Services.RestHan中的.Web.Script.Services.RestHandler.InvokeMethod（HttpContext context，WebServiceMethodData methodData，IDictionary`2 rawParams）\\ r \\ n dler.ExecuteWebServiceCall（HttpContext context，WebServiceMethodData methodData）“，”ExceptionType“：”System.InvalidOperationException“}

无论如何在jquery ajax中使用c＃datatable !!

Answer 1

c＃代码

  [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;
        }

javascript代码成功：

 success: function (serverdata) {

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

Answer 2

你需要做这样的事情

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

   return JsonConvert.SerializeObject(dt621);
}

然后成功调用ajax

 success: function (data) {

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

Answer 3

错误说有循环引用。 如果你知道它们实际上不存在，那么使用Json.NET序列化对象作为对AJAX调用的响应或创建更简单的DTO。 我有.net框架中的默认序列化程序的类似问题 - 它无法序列化一个对象，因为CR实际上不存在！ 转移到Json.NET为我解决了这个问题。