質問編集履歴
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コードをすべて記述、補足
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@@ -1,5 +1,6 @@
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Newtonsoft.Jsonを使ってJSONをデシアライズしようとしてますが、上手くできません。
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ビルドはうまくいきますが、以下の例外エラーが出てしまいます。
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JSONの読み込みは上手くできています。
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```
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**Newtonsoft.Json.JsonSerializationException:** 'Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[BEStatus.ShopItem]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
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To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
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@@ -7,37 +8,153 @@
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```
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JSONに変換する部分はこのように書きました。
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```C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Text;
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using System.Net.Http;
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using Newtonsoft.Json;
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using System.Threading.Tasks;
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using System.Runtime.Serialization.Json;
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namespace BEStatus
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{
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class GetApiData
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{
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//API情報
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public string Token = "(Token key)";
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public string Store_URL = "https://--";
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//アイテムショップの処理
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-
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public List<ShopItem> ShopList;
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public async Task<List<ShopItem>> ShopItemAsync()
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{
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//List作成
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ShopList = new List<ShopItem>();
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HttpClient httpClient = new HttpClient();
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httpClient.DefaultRequestHeaders.Add("Authorization", Token);
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//非同期でAPI取得
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Task<string> stringAsync = httpClient.GetStringAsync(Store_URL);
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string result = await stringAsync;
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Debug.WriteLine(result);
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//Jsonに変換
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ShopList = JsonConvert.DeserializeObject<List<ShopItem>>(result);
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//Listでreturn
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return ShopList;
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}
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}
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public class ShopImages
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{
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public string icon { get; set; }
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public string background { get; set; }
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public string featured { get; set; }
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public string fbackground { get; set; }
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}
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public class ShopItem
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{
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public string name { get; set; }
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public string rarity { get; set; }
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public string type { get; set; }
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public ShopImages images { get; set; }
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}
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public class ShopStore
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{
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public int cost { get; set; }
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public int regularCost { get; set; }
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public bool isFeatured { get; set; }
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public bool isNew { get; set; }
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public bool isCommunityVote { get; set; }
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}
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public class ShopDatum
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{
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public string itemId { get; set; }
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public ShopItem item { get; set; }
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public ShopStore store { get; set; }
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}
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public class ShopRootObject
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{
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public List<ShopDatum> data { get; set; }
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public int updateAt { get; set; }
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}
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}
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```
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下のコードはリストを表示させるためのコードです(Xamarin)
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```C#
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using System;
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using System.Collections.Generic;
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using System.Net.Http;
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using Newtonsoft.Json;
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using System.Threading.Tasks;
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using System.Runtime.Serialization.Json;
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using System.Text;
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using Xamarin.Forms;
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using Xamarin.Forms.Xaml;
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namespace BEStatus
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{
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[XamlCompilation(XamlCompilationOptions.Compile)]
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public partial class TodayItemShop : ContentPage
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{
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public ListView listView;
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public List<ShopItem> ShopList;
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public TodayItemShop()
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{
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//リストのデザイン系
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InitializeComponent();
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listView = new ListView
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{
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RowHeight = 60
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};
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Content = new StackLayout
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{
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VerticalOptions = LayoutOptions.FillAndExpand,
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Children = { listView }
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};
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fetchArticles(new GetApiData());
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}
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//非同期でデータ取得
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async void fetchArticles(GetApiData Api)
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{
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ShopList = await Api.ShopItemAsync();
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var items = new List<String>();
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foreach (ShopItem value in ShopList)
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{
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items.Add(value.name);
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}
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listView.ItemsSource = items;
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}
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}
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}
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```
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読み込むJSONの文字列はこんな感じです。
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143
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読み込むJSONの文字列はこんな感じです。
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```JSON
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{
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"data": [
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{
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"itemId": "
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"itemId": "ID",
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"item": {
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"name": "Sunrise",
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"rarity": "rare",
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"type": "glider",
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"images": {
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"icon": "
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"icon": "URL",
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"background": "
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"background": "URL",
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"featured": "
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"featured": "URL",
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"fbackground": "
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"fbackground": "URL"
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}
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},
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"store": {
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@@ -46,6 +163,96 @@
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"isFeatured": true,
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"isNew": false,
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"isCommunityVote": false
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}
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},
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{
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"itemId": "ID",
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"item": {
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"name": "Sky Stripe",
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"rarity": "uncommon",
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"type": "glider",
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"images": {
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"icon": "URL",
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"background": "URL",
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"featured": "URL",
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"fbackground": "URL"
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}
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},
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"store": {
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"cost": 500,
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"regularCost": 500,
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"isFeatured": true,
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"isNew": false,
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"isCommunityVote": false
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}
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},
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{
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"itemId": "ID",
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"item": {
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"name": "Axetec",
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"rarity": "rare",
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"type": "pickaxe",
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"images": {
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"icon": "URL",
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"background": "URL",
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"featured": "URL",
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"fbackground": "URL"
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}
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},
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"store": {
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"cost": 800,
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"regularCost": 800,
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"isFeatured": true,
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"isNew": false,
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"isCommunityVote": false
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}
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},
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{
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"itemId": "ID",
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"item": {
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"name": "Stripe Slicer",
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"rarity": "uncommon",
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"type": "pickaxe",
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"images": {
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"icon": "URL",
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"background": "URL",
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"featured": "URL",
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"fbackground": "URL"
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}
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},
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"store": {
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"cost": 500,
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"regularCost": 500,
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"isFeatured": true,
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"isNew": false,
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"isCommunityVote": false
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}
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},
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{
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"itemId": "ID",
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"item": {
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"name": "Iron Beak",
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"rarity": "rare",
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"type": "pickaxe",
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"images": {
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"icon": "URL",
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"background": "URL",
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"featured": "URL",
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"fbackground": "URL"
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}
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},
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"store": {
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"cost": 800,
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"regularCost": 800,
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"isFeatured": true,
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248
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"isNew": false,
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249
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"isCommunityVote": false
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}
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}
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],
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"updateAt": 1570406481
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}
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```
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51
258
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JSONはあまり触ったことがないので初歩的な質問かもしれませんが、回答よろしくお願いします。
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