自动完成显示对象而不是显示值？

Question

我尝试在自动完成时显示数据库中的数据，并在用户使用 jquery，web service 选择时自动完成自动完成。但它没有显示，它显示所有数据，如对象也不会转到指定的URL。 请帮帮我。

这是我的jquery：

function SearchText() {
          debugger;
          $(".searchtextbxclass").autocomplete({
              source: function (request, response) {
                  debugger;
                  $.ajax({
                      url: "/Services/SearchService.asmx/SearchCategory",
                      data: "{ 'searchtxt': '" + request.term + "' }",
                      dataType: "json",
                      type: "POST",
                      /*contentType: "application/json; charset=utf-8",*/
                      contentType: "application/json;",
                      dataFilter: function (data) { return data; },
                      success: function (data) {

                          response($.map(data.d, function (item) {

                              return {
                                  value: item
                              }
                          }))
                      },
                      error: function (XMLHttpRequest, textStatus, errorThrown) {
                          alert(textStatus);
                      }
                  });
              },
              minLength:2,
              select: function (event, ui) {
                  debugger;
                  $(this).val(ui.item.value);

                  doSearch(ui.item.value);
                  //$(this).closest('form').submit();
              }
          });
      };

      function doSearch(srchVal) {
          debugger;
          window.location.href = 'Default.aspx?searchtxt=' + searchtxt;
      }

这是我的网络服务：

  public class SearchService : System.Web.Services.WebService
    {
  [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public List<CategoryLevelModel>  SearchCategory(string searchtxt)
        {
 List<CategoryLevelModel> categories = new List<CategoryLevelModel>();
              CustSite_INDIAEntities ctx = new CustSite_INDIAEntities();
              var cat1 = from b in ctx.tbl_CategoryLevel1 where b.Cat1_Name.Contains(searchtxt) select new { b.PID, b.Cat1_Name };
              var cat2 = from b in ctx.tbl_CategoryLevel2 where b.Cat2_Name.Contains(searchtxt) select new { b.PID, b.Cat2_Name };
              var cat3 = from b in ctx.tbl_CategoryLevel3 where b.Cat3_Name.Contains(searchtxt) select new { b.PID, b.Cat3_Name };
              var cat4 = from b in ctx.tbl_CategoryLevel4 where b.Cat4_Name.Contains(searchtxt) select new { b.PID, b.Cat4_Name };
              var cat5 = from b in ctx.tbl_CategoryLevel5 where b.Cat5_Name.Contains(searchtxt) select new { b.PID, b.Cat5_Name };
 foreach (var item in cat1)
            {
               CategoryLevelModel cat = new CategoryLevelModel();
               cat.level_id = 1;
               cat.pid = item.PID;
               cat.cat_name = item.Cat1_Name;
               categories.Add(cat);

            }
            //Level 2
            foreach (var item in cat2)
            {
                CategoryLevelModel cat = new CategoryLevelModel();
                cat.level_id = 1;
                cat.pid = item.PID;
                cat.cat_name = item.Cat2_Name;
                categories.Add(cat);

            }
            //Level 3
            foreach (var item in cat3)
            {
                CategoryLevelModel cat = new CategoryLevelModel();
                cat.level_id = 1;
                cat.pid = item.PID;
                cat.cat_name = item.Cat3_Name;
                categories.Add(cat);

            }
            //Level 4
            foreach (var item in cat4)
            {
                CategoryLevelModel cat = new CategoryLevelModel();
                cat.level_id = 1;
                cat.pid = item.PID;
                cat.cat_name = item.Cat4_Name;
                categories.Add(cat);

            }
            return categories;
        }
    }
}

这是我的模型：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace SearchModule.Model
{
    public class CategoryLevelModel
    {
        public double pid { get; set; }
        public double level_id { get; set; }
        public string cat_name { get; set; }
    }
}