将 JSON 反序列化为一个对象，然后运行一个 foreach 循环添加到一个列表视图中

Question

我一直在努力反序列化来自我用于我的应用程序的 IGDB API 的 JSON 请求 return。我已经成功地在我的项目的另一部分反序列化，但是这个 JSON 有多个值，我不确定如何正确地转换成对象成员。我经常收到 System.Text.Json 个异常。

我的 GameListObject class 设置为：

 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; }
    }

Try 语句 API 请求和 return:

//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 语句中收到错误：在 'gamelistobject' 下声明“foreach 语句无法对类型 'GameHubs.GameListObject' 的变量进行操作，因为它不包含 public 的实例或扩展定义'GetEnumerator'

来自 API 的 return JSON 语句示例：

{
    "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"
      }
    ]
  }

Answer 1

尝试使用 List 而不是 GameListObject，在这种情况下你不需要 foreach 循环

//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);

一行也行

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

测试


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}");
        }
    }

产出

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

并尝试这门课

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; }
}

将 JSON 反序列化为一个对象，然后运行一个 foreach 循环添加到一个列表视图中

Deserialize JSON into an object, and then run a foreach loop to add into a listview

c#

json

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json-deserialization

system.text.json

将 JSON 反序列化为一个对象，然后 运行 一个 foreach 循环添加到一个列表视图中

Deserialize JSON into an object, and then run a foreach loop to add into a listview

c#

json

deserialization

json-deserialization

system.text.json

将 JSON 反序列化为一个对象，然后运行一个 foreach 循环添加到一个列表视图中