使用Linq 查询数据 构建对象 select new{}

linq 查询数据

        /// <summary>
        /// 汽车品牌及车型
        /// </summary>
        /// <returns></returns>
        public string GetCarBrandSeries()
        {
            var result = from a in db.CR_BC_BRAND
                         join c in db.CR_BC_BRAND_SERIES on a.CR_BC_BRAND_ID equals c.CR_BC_BRAND_ID
                         select new
                         {
                             id = c.CR_BC_BRAND_SERIES_ID,
                             name = a.BRAND_NAME + c.SERIES_NAME
                         };
            var JsonData = jsz.Serialize(result);
            return JsonData;
        }

        /// <summary>
        /// 城市信息
        /// </summary>
        /// <returns></returns>
        public string CarInfo()
        {
			//linq联合查询。
            var fromCityList = from a in db.CR_BC_CITY
                       join b in db.CR_BC_STORE on a.CR_BC_CITY_ID equals b.CR_BC_CITY_ID
                       join c in db.CR_BE_CAR_RENTAL on b.CR_BC_STORE_ID equals c.CR_BC_STORE_ID
                       join d in db.CR_BE_TAILWIND_CAR_RENTAL on c.CR_BE_CAR_RENTAL_ID equals d.CR_BE_CAR_RENTAL_ID
                       select a;

			//linq联合查询。
            var toCityList = from a in db.CR_BC_CITY
                             join b in db.CR_BE_TAILWIND_CAR_RENTAL on a.CR_BC_CITY_ID equals b.CR_BC_CITY_ID
                             select a;

            var humpPinyinsList = from a in fromCityList join b in toCityList on a.CR_BC_CITY_ID equals b.CR_BC_CITY_ID select new { a.HUMP_PINYINS };
            foreach (var v in humpPinyinsList)
            {
				//这里用到了用split切割字符串。

humpPinyins = v.HUMP_PINYINS.Split(',').ToList();
            }

			//将fromCityList(表) 与toCityList(表) 用Concat方法连接起来  然后用Distinct方法去除反复数据
            var allCity = from a in fromCityList.Concat(toCityList).Distinct()
                          select new
                          {
                              capitalcity = a.CAPITAL_CITY,//是否为省会城市
                              code = a.CR_BC_CITY_ID,//城市ID
                              enName = a.EN_NAME,
                              flag = 1,
                              home = false,
                              humpPinyins, //城市名称缩写序列
                              municipality = a.MUNICIPALITY,
                              name = a.CITY_NAME,
                              newflag = false,
                              szm =  db.CR_BC_STORE.Where(r=>r.CR_BC_CITY_ID==a.CR_BC_CITY_ID).Count()+"家门店",
                              top = a.ISTOP,
                              tour = a.ISTOUR,
                          };

            var fromCity = from a in fromCityList.Distinct()

                           select new
                           {
                               capitalcity = a.CAPITAL_CITY,
                               code = a.CR_BC_CITY_ID,
                               enName = a.EN_NAME,
                               flag = 1,
                               home = false,
                               humpPinyins,
                               municipality = a.MUNICIPALITY,
                               name = a.CITY_NAME,
                               newflag = false,
                               opening_time = "",
                               szm = db.CR_BC_STORE.Where(r => r.CR_BC_CITY_ID == a.CR_BC_CITY_ID).Count() + "家门店",
                               top = a.ISTOP,
                               tour = a.ISTOUR,
                           };

            var toCity = from a in toCityList.Distinct()
                         select new
                         {
                             citys = new
                            {
                                capitalcity = a.CAPITAL_CITY,
                                code = a.CR_BC_CITY_ID,
                                enName = a.EN_NAME,
                                flag = 1,
                                home = false,
                                humpPinyins ,
                                municipality = a.MUNICIPALITY,
                                name = a.CITY_NAME,
                                newflag = false,
                                opening_time = "",
                                szm = db.CR_BC_STORE.Where(r => r.CR_BC_CITY_ID == a.CR_BC_CITY_ID).Count() + "家门店",
                                top = a.ISTOP,
                                tour = a.ISTOUR,
                            },
                             fromCityId = a.CR_BC_CITY_ID,
                         };

            var x = new { allCity, fromCity, toCity };

            var jsonData = jsz.Serialize(x);
            return jsonData;
        }

构造出来的对象 转成js格式

{
  "allCity": [
    {
      "capitalcity": true,
      "code": 2,
      "enName": "guagnzhou",
      "flag": 1,
      "home": false,
      "humpPinyins": [
        "GZ"
      ],
      "municipality": false,
      "name": "广州",
      "newflag": false,
      "szm": "2家门店",
      "top": true,
      "tour": true
    },
    {
      "capitalcity": true,
      "code": 3,
      "enName": "shenzhen",
      "flag": 1,
      "home": false,
      "humpPinyins": [
        "GZ"
      ],
      "municipality": false,
      "name": "深圳",
      "newflag": false,
      "szm": "0家门店",
      "top": true,
      "tour": true
    }
  ],
  "fromCity": [
    {
      "capitalcity": true,
      "code": 2,
      "enName": "guagnzhou",
      "flag": 1,
      "home": false,
      "humpPinyins": [
        "GZ"
      ],
      "municipality": false,
      "name": "广州",
      "newflag": false,
      "opening_time": "",
      "szm": "2家门店",
      "top": true,
      "tour": true
    }
  ],
  "toCity": [
    {
      "citys": {
        "capitalcity": true,
        "code": 2,
        "enName": "guagnzhou",
        "flag": 1,
        "home": false,
        "humpPinyins": [
          "GZ"
        ],
        "municipality": false,
        "name": "广州",
        "newflag": false,
        "opening_time": "",
        "szm": "2家门店",
        "top": true,
        "tour": true
      },
      "fromCityId": 2
    },
    {
      "citys": {
        "capitalcity": true,
        "code": 3,
        "enName": "shenzhen",
        "flag": 1,
        "home": false,
        "humpPinyins": [
          "GZ"
        ],
        "municipality": false,
        "name": "深圳",
        "newflag": false,
        "opening_time": "",
        "szm": "0家门店",
        "top": true,
        "tour": true
      },
      "fromCityId": 3
    }
  ]
}