C#-將JSON反序列化為物件，然后運行??foreach回圈添加到串列視圖中

我一直在努力反序列化從我用于我的應用程式的 IGDB API 回傳的 JSON 請求。我已經成功地在我專案的另一部分成功反序列化，但是這個 JSON 有多個值，我不確定如何正確轉換為物件成員。我不斷收到 System.Text.Json 例外。

我的 GameListObject 類設定為：

 public class GameListObject
    {
        [JsonPropertyName("id")]
        public string GameID { get; set; }
        [JsonPropertyName("name")]
        public string GameName { get; set; }
        [JsonPropertyName("release_dates")]
        public string ReleaseDate { get; set; }
    }

API 請求和回傳的 Try 陳述句：

//On search box content change
    private async void gamehub_search_TextChanged(object sender, TextChangedEventArgs e)
    {
        ObservableCollection<GameListObject> dataList = new ObservableCollection<GameListObject>();
        gamehub_list.ItemsSource = dataList;
        dataList.Clear();

        var SearchQuery = gamehub_search.Text;

        try
        {
            // Construct the HttpClient and Uri
            HttpClient httpClient = new HttpClient();
            Uri uri = new Uri("https://api.igdb.com/v4/games");

            httpClient.DefaultRequestHeaders.Add("Client-ID", App.GlobalClientidIGDB);
            httpClient.DefaultRequestHeaders.Add("Authorization", "Bearer "   App.GlobalAccessIGDB);
            //Debug.WriteLine("Request Headers: ");

            // Construct the JSON to post
            HttpStringContent content = new HttpStringContent($"search \"{SearchQuery}\"; fields name,release_dates.human;");
            Debug.WriteLine("Request Contents: "   content);

            // Post the JSON and wait for a response
            HttpResponseMessage httpResponseMessage = await httpClient.PostAsync(
                uri,
                content);

            // Make sure the post succeeded, and write out the response
            httpResponseMessage.EnsureSuccessStatusCode();
            var httpResponseBody = await httpResponseMessage.Content.ReadAsStringAsync();
            Debug.WriteLine("Request Response: "   httpResponseBody);

            //Deserialise the return output into game id, game name and release date
            GameListObject gamelistobject = JsonSerializer.Deserialize<GameListObject>(httpResponseBody);


            foreach (GameListObject GameListObject in gamelistobject) //Receiving error under 'gamelistobject'
            {
                //Add new item to the ListView
                GameListObject newitem = new GameListObject() { GameID = gamelistobject.GameID, GameName = gamelistobject.GameName, ReleaseDate = gamelistobject.ReleaseDate };
                dataList.Add(newitem);
            }

            Debug.WriteLine($"id: {gamelistobject.GameID}");
            Debug.WriteLine($"name: {gamelistobject.GameName}");
            Debug.WriteLine($"release_dates: {gamelistobject.ReleaseDate}");
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex);
        }
    }

注意：在 Foreach 陳述句中接收錯誤：在“gamelistobject”下，說明“foreach 陳述句不能對“GameHubs.GameListObject”型別的變數進行操作，因為它不包含“GetEnumerator”的公共實體或擴展定義

從 API 回傳 JSON 陳述句的示例：

{
    "id": 277,
    "name": "Battlefield 2",
    "release_dates": [
      {
        "id": 52086,
        "human": "Jun 21, 2005"
      },
      {
        "id": 52087,
        "human": "Jun 22, 2005"
      },
      {
        "id": 52088,
        "human": "Jun 24, 2005"
      }
    ]
  },
  {
    "id": 89571,
    "name": "Battlefield V: Deluxe Edition",
    "release_dates": [
      {
        "id": 157810,
        "human": "Nov 16, 2018"
      },
      {
        "id": 157811,
        "human": "Nov 16, 2018"
      },
      {
        "id": 157812,
        "human": "Nov 16, 2018"
      }
    ]
  }

uj5u.com熱心網友回復：

嘗試使用 List 而不是 GameListObject，在這種情況下你不需要 foreach 回圈

//Deserialise the return output into game id, game name and release date
   List<GameListObject> gamelistobjects = JsonSerializer.Deserialize<List<GameListObject>>(httpResponseBody);


   ObservableCollection<GameListObject> dataList = 
new ObservableCollection<GameListObject>(gamelistobjects);

甚至一行都可以

 ObservableCollection<GameListObject> dataList = JsonConvert.DeserializeObject<ObservableCollection<GameListObject>>(json);

測驗

foreach (var item in dataList)
    {
        Debug.WriteLine($"id: {item.GameID}");
        Debug.WriteLine($"name: {item.GameName}");

         if(item.ReleaseDates!=null)
        foreach (var date in item.ReleaseDates)
        {
            Debug.WriteLine($"releaseDate: {date.Human}");
        }
    }

輸出

d: 277
name: Battlefield 2
releaseDate: Jun 21, 2005
releaseDate: Jun 22, 2005
releaseDate: Jun 24, 2005
id: 89571
name: Battlefield V: Deluxe Edition
releaseDate: Nov 16, 2018
releaseDate: Nov 16, 2018
releaseDate: Nov 16, 2018

并嘗試這門課

public partial class GameListObject
    {
    [JsonProperty("id")]
    public long GameID { get; set; }

    [JsonProperty("name")]
    public string GameName { get; set; }

    [JsonProperty("release_dates")]
    public ObservableCollection<ReleaseDate> ReleaseDates { get; set; }
}

public partial class ReleaseDate
{
    [JsonProperty("id")]
    public long Id { get; set; }

    [JsonProperty("human")]
    public string Human { get; set; }
}

public partial class ReleaseDate
{
    [JsonProperty("id")]
    public long Id { get; set; }

    [JsonProperty("human")]
    public string Human { get; set; }
}

標籤：C＃ json 反序列化 json-反序列化

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