C# 新手卡關

asp.net c#

不明 2022-09-30 20:03:58 ‧ 1473 瀏覽

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最近剛接觸.net不到一個月
最近在做一個小題目
鄉鎮市的下拉選單選完後
會呈現口罩地圖的資料(就是全台縣市藥局口罩剩餘數)
以上兩個都是用政府的開放API(是不同的)
但我之前寫出來的是用區去過濾出我要的資料
(controller)

 public class GetareaController : Controller
    {

        public async Task<ActionResult> Index()
        {
            var b = new GetCollection();
            var areasource = await b.GetInserchdata();
            ViewBag.AllCity = areasource.Select(s => s.City).Distinct().Select(item => new SelectListItem()
            {
                Text = item,
                Value = item
            });
            var masksource = await b.GetMaskmapdata();

            
            return View();



        }

        
        [HttpPost]
        public async Task<JsonResult> GetSecondDDL(string cityName)
        {


            var CitySlectList = this.GetSelectList(await GetCity(), cityName);


            if (string.IsNullOrEmpty(cityName))
            {
                return Json(new EmptyResult());
            }
            var AreaSlectList = await this.GetArea(cityName);

            return Json(AreaSlectList);



        }

        [HttpPost]
        public async Task<JsonResult> GetMaskmap(string cityName, string areaName)
        {
            var b = new GetCollection();
            var source = GetCollection.maskdata;
            //var SelectList = await this.GetArea(cityName);
            var aa = source.FindAll(x => x.醫事機構地址.Contains("基隆市"));
            var Maskdata = aa.FindAll(x => x.醫事機構地址.Contains(areaName)).AsEnumerable();
            if (string.IsNullOrEmpty(areaName))
            {
                return Json(new EmptyResult());
            }
            return Json(Maskdata);

        }
       



        public IEnumerable<SelectListItem> GetSelectList(IEnumerable<string> source,

           string selectedItem)
        {

            var selectList = source.Select(item => new SelectListItem()
            {
                Text = item,
                Value = item.ToString(),
                Selected = !string.IsNullOrWhiteSpace(selectedItem)
                            && item.Equals(selectedItem, StringComparison.OrdinalIgnoreCase)

            });
            return selectList;

        }


        public async Task<List<string>> GetCity()
        {
            var b = new GetCollection();
            var citysource = await b.GetInserchdata();
            if (citysource != null)
            {
                var country = citysource.Select(x => x.City)
                                        .Distinct();

                return country.ToList();
            }
            return new List<string>();


        }


        public async Task<List<string>> GetArea(string cityName)
        {
            var b = new GetCollection();
            var areasource = await b.GetInserchdata();
            if (areasource != null)
            {
                var district = areasource.Where(x => x.City == cityName).Select(x => x.Area)
                                 .Distinct();

                return district.ToList();
            }
            return new List<string>();

        }

後來才發現不同的縣市會有重複的區名
我想知道我大概要怎麼改比較好呢
我目前 public JsonResult GetMaskmap(string cityName, string areaName)
{
var b = new GetCollection();
var source = GetCollection.maskdata;
//var SelectList = await this.GetArea(cityName);
var aa = source.FindAll(match: x => x.醫事機構地址.Contains(cityName)); (((這裡會是null
但areaName是可以抓到值的
(除非在裡面直接contain縣市的名稱如內容裡"基隆市")

我想說是否可以直接在ajax裡面多加CITY 的value參數
但好像也沒辦法
希望各位前輩不吝嗇指教

(model 兩個api都在這裡抓)

  public class Inserch
    {
        [Display(Name = "縣市")]
        public string City { get; set; }
        [Display(Name = "鄉鎮")]
        public string Area { get; set; }




        public string 醫事機構代碼 { get; set; }
        public string 醫事機構名稱 { get; set; }
        public string 醫事機構地址 { get; set; }
        public string 醫事機構電話 { get; set; }
        public string 成人口罩剩餘數 { get; set; }
        public string 兒童口罩剩餘數 { get; set; }

    }
    public class GetCollection
    {
        public static List<Inserch> collection;
        public static List<Inserch> maskdata;
        public async Task<IEnumerable<Inserch>> GetInserchdata()
        {
            string cacheName = "Area_Inserches";

            ObjectCache cache = MemoryCache.Default;
            CacheItem cacheContents = cache.GetCacheItem(cacheName);

            if (cacheContents == null)
            {
                return await RetriveInserchdata(cacheName);
            }
            else
            {
                return cacheContents.Value as IEnumerable<Inserch>;
            }

        }


        public async Task<IEnumerable<Inserch>> RetriveInserchdata(string cacheName)
        {

            string targetURI = "https://quality.data.gov.tw/dq_download_json.php?nid=5948&md5_url=b7ce2082883f6b680810828799d4c32e";

            HttpClient client = new HttpClient();
          var response = await client.GetStringAsync(targetURI);
            collection = JsonConvert.DeserializeObject<List<Inserch>>(response);

            
            CacheItemPolicy policy = new CacheItemPolicy();
            policy.AbsoluteExpiration = DateTime.Now.AddMinutes(30);

            ObjectCache cacheItem = MemoryCache.Default;
            cacheItem.Add(cacheName, collection, policy);

            return collection;

        }
        public async Task<IEnumerable<Inserch>> GetMaskmapdata()
        {
            string targetURI = "https://quality.data.gov.tw/dq_download_json.php?nid=116285&md5_url=53a72b2dcfdd9ecae43afda4b86089be";

            HttpClient client = new HttpClient();
            client.MaxResponseContentBufferSize = Int32.MaxValue;
            var response = await client.GetStringAsync(targetURI);
            //ViewBag.Result = Regex.Unescape(response);
            maskdata = JsonConvert.DeserializeObject<List<Inserch>>(response);
            return maskdata;
        }
    }

}

(view)

@using Test.Models

@model IEnumerable<Test.Models.Inserch>


@{
    ViewBag.Title = "Index";
    var data = ViewBag.allData;

}

@section scripts {



    <script type="text/javascript">
        $(document).ready(function () {
        $("#CITY").change(function () { ChangeCity(); });
        $("#AREA").change(function () { ChangeArea(); });
              $(document).on('submit', '#ButtonSubmit', function () {
                return false;
            });
           
    });
        function SetareaEmpty() {
            $('#CITY').empty();
            $('#CITY').append($('<option></option>').val('').text('請選擇'));
        }
        function ChangeCity() {
            var selectedCity = $.trim($('#CITY option:selected').val());
            if ($.trim(selectedCity.length) > 0) {
                ChangeArea(selectedCity);
            }
            else {
                SetareaEmpty()
            }
        }
        function ChangeArea(selectedCity) {
            $.ajax({
                type: "POST",
                url: '@Url.Action("GetSecondDDL", "Getarea")',
                dataType: "json",
                data: { cityName: selectedCity },
                success: function (mems) {
                    if (mems.length > 0) {
                        $('#AREA').empty();
                        $('#AREA').append($('<option></option>').val('').text('請選擇'));
                    }
                    $.each(mems, function (i, member) {
                        $("#AREA").append($('<option></option>').val(member).text(member));

                    });
                }
            });

        }
        function SerchallData(selectedCity) {
            var selectedValue = $('#AREA option:selected').val();
            if ($.trim(selectedValue).length > 0) {
                $.ajax({
                    url: '@Url.Action("GetMaskmap", "Getarea")',
                    data: { cityName: selectedCity, areaName: selectedValue },
                    type: 'POST',
                    dataType: 'json',
                    success: function (data) {
                    $('#MASK').empty;
                       for (var i = 0; i < data.length; i++) {
                            var row = $('<tr><td>' + data[i].醫事機構代碼 + '</td><td>' + data[i].醫事機構名稱 + '</td><td>' + data[i].醫事機構地址 + '</td></tr>' + '<tr><td>' + data[i].醫事機構電話 + '</td><td>' + '<tr><td>' + data[i].成人口罩剩餘數 + '</td><td>' + '<tr><td>' + data[i].兒童口罩剩餘數 + '</td><td>');
                           $('#MASK').append(row);
                           
                        }
                    },
                    error: function (jqXHR, textStatus, errorThrown) {
                        alert('Error: ' + textStatus + ' - ' + errorThrown);
                    }
                });

            }
        }

                       
         

    </script>
}


<div class="row well">
    <form>
        <div class="col-lg-3">
            <div class="input-group">
                <span class="input-group-addon">縣市</span>
                <p>
                    @Html.DropDownList("City", (IEnumerable<SelectListItem>)ViewBag.Allcity, "請選擇", new { id = "CITY" })
                </p>
            </div>
        </div>
        <div class="col-lg-3">
            <div class="input-group">
                <span class="input-group-addon">鄉鎮</span>
                <p> <select id="AREA" name="AREA"><option>請選擇</option></select></p>

            </div>
        </div>

    </form>
        <div class="col-lg-2">
            <button type="submit" onclick="SerchallData()" id="ButtonSubmit" class="btn btn-primary">
                <span class="glyphicon glyphicon-search"></span>查詢
            </button>

        </div>
    

</div>


<table id="MASK">

    <tr>
        <th>醫事機構代碼</th>
        <th>醫事機構名稱</th>
        <th>醫事機構地址</th>
        <th>醫事機構電話</th>
        <th>成人口罩剩餘數</th>
        <th>兒童口罩剩餘數</th>
    </tr>


   
</table>

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Coding小僧 iT邦新手 3 級 ‧ 2022-09-30 22:12:04 檢舉

哇新手就可以自己寫這麼厲害的東西了呀!
我比較納悶 var aa = source.FindAll(match: x => x.醫事機構地址.Contains(cityName));
如果source沒問題篩出來怎麼會是null勒？

不明檢舉

感謝小僧大大的誇獎，我也是看了很多大神的code自己改的
這邊說明一下
我的GetInserchdata的來源是鄉鎮市的api拿來做下拉選單
而這也是GetCity和GetArea的source
我先用GetCity做出第一層下拉選單再用GetArea取出低一層所選的縣市找出他所包含的區
但是您所說的那個source,也就是maskdata
那個是另外一隻api(口罩地圖的)
我在ajax裡那時候就是綁訂了選擇區之後過濾出資料
所以變成現在只有areaName抓的到
所以我現在不知道要從controller改還是
從ajax裡多加參數嗎

科科 iT邦研究生 1 級 ‧ 2022-09-30 23:43:20 檢舉

function SerchallData(selectedCity) => selectedCity 傳進來的是空的嗎?

那你要想辦法抓到City(縣市)、Area(區域)的值，丟進API裡查詢，
才會同時用到City(縣市)、Area(區域)去篩選資料。

然後程式碼貼圖片不是很方便複製你的程式碼，
而且好像也不完整，看不到頁面呼叫的方式，
也不好看出前端哪裡有問題。

阿盲 iT邦新手 2 級 ‧ 2022-09-30 23:54:14 檢舉

截圖不太清楚從哪邊的資料開始出現問題，確認一下你資料傳輸的狀況
1.到最後一步呼叫api - GetMaskmap時cityName跟areaName都有正常的傳送內容進去嗎?
2.javascript中的function SerchallData(selectedCity)這個selectedCity有成功餵進去?

不明檢舉

補上我的完整的code
再麻煩各位大大了
selectedCity是有抓到值
但就是area的

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1 個回答

阿盲

iT邦新手 2 級 ‧ 2022-10-01 00:33:50

最佳解答

因為你button呼叫時沒餵縣市參數給function SerchallData(selectedCity)，selectedCity為undefined，改成以下就正常了

function SerchallData() {
    var selectedCity = $('#CITY option:selected').val();//新增讀取縣市
    var selectedValue = $('#AREA option:selected').val();
    if ($.trim(selectedValue).length > 0) {
        ...
        });
    }
}