[英]Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON object
[英]JsonSerializationException: Cannot deserialize the current JSON object
我对 C# 和 Visualstudio2017 非常陌生,并且已经坚持了几个星期。 搜索网络,但没有找到与此相关的我可以正确理解的结果。 我想要做的是从https://zkillboard.com/api/stats/characterID/224802743/获取 json 数据,然后将其转换为可用数据,我可以获取并在某些文本框中显示某些数据。 我使用https://quicktype.io/将 json 转换为 C# 数组。
主窗体
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Net;
using ZKILLBOARDDATA;
namespace MainProgram
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.ResizeRedraw, true);
}
public async void Btn_submit_ClickAsync(object sender, EventArgs e)
{
var remoteUri = "https://zkillboard.com/api/stats/characterID/224802743/";
var myWebClient = new WebClient();
myWebClient.Headers.Add("user-agent", "C# App testing");
var jsonString = await myWebClient.DownloadStringTaskAsync(remoteUri);
var data = GettingStarted.FromJson(jsonString);
}
}
}
Zkill.cs
using Newtonsoft.Json;
// To parse this JSON data, add NuGet 'Newtonsoft.Json' then do:
//
// using ZKILLBOARDDATA;
//
// var data = GettingStarted.FromJson(jsonString);
//
namespace ZKILLBOARDDATA
{
public partial class GettingStarted
{
[JsonProperty("attackers")]
public Attacker[] Attackers { get; set; }
[JsonProperty("killmail_id")]
public long KillmailId { get; set; }
[JsonProperty("killmail_time")]
public string KillmailTime { get; set; }
[JsonProperty("moon_id")]
public long? MoonId { get; set; }
[JsonProperty("solar_system_id")]
public long SolarSystemId { get; set; }
[JsonProperty("victim")]
public Victim Victim { get; set; }
[JsonProperty("war_id")]
public long? WarId { get; set; }
[JsonProperty("zkb")]
public Zkb Zkb { get; set; }
}
public partial class Zkb
{
[JsonProperty("awox")]
public bool Awox { get; set; }
[JsonProperty("fittedValue")]
public double FittedValue { get; set; }
[JsonProperty("hash")]
public string Hash { get; set; }
[JsonProperty("locationID")]
public long LocationID { get; set; }
[JsonProperty("npc")]
public bool Npc { get; set; }
[JsonProperty("points")]
public long Points { get; set; }
[JsonProperty("solo")]
public bool Solo { get; set; }
[JsonProperty("totalValue")]
public double TotalValue { get; set; }
}
public partial class Victim
{
[JsonProperty("alliance_id")]
public long? AllianceId { get; set; }
[JsonProperty("character_id")]
public long? CharacterId { get; set; }
[JsonProperty("corporation_id")]
public long CorporationId { get; set; }
[JsonProperty("damage_taken")]
public long DamageTaken { get; set; }
[JsonProperty("items")]
public Item[] Items { get; set; }
[JsonProperty("position")]
public Position Position { get; set; }
[JsonProperty("ship_type_id")]
public long ShipTypeId { get; set; }
}
public partial class Position
{
[JsonProperty("x")]
public double X { get; set; }
[JsonProperty("y")]
public double Y { get; set; }
[JsonProperty("z")]
public double Z { get; set; }
}
public partial class Item
{
[JsonProperty("flag")]
public long Flag { get; set; }
[JsonProperty("item_type_id")]
public long ItemTypeId { get; set; }
[JsonProperty("items")]
public Item[] Items { get; set; }
[JsonProperty("quantity_destroyed")]
public long? QuantityDestroyed { get; set; }
[JsonProperty("quantity_dropped")]
public long? QuantityDropped { get; set; }
[JsonProperty("singleton")]
public long Singleton { get; set; }
}
public partial class Attacker
{
[JsonProperty("alliance_id")]
public long? AllianceId { get; set; }
[JsonProperty("character_id")]
public long? CharacterId { get; set; }
[JsonProperty("corporation_id")]
public long? CorporationId { get; set; }
[JsonProperty("damage_done")]
public long DamageDone { get; set; }
[JsonProperty("faction_id")]
public long? FactionId { get; set; }
[JsonProperty("final_blow")]
public bool FinalBlow { get; set; }
[JsonProperty("security_status")]
public double SecurityStatus { get; set; }
[JsonProperty("ship_type_id")]
public long? ShipTypeId { get; set; }
[JsonProperty("weapon_type_id")]
public long? WeaponTypeId { get; set; }
}
public partial class GettingStarted
{
public static GettingStarted[] FromJson(string json) => JsonConvert.DeserializeObject<GettingStarted[]>(json, Converter.Settings);
}
public static class Serialize
{
public static string ToJson(this GettingStarted[] self) => JsonConvert.SerializeObject(self, Converter.Settings);
}
public class Converter
{
public static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
{
MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
DateParseHandling = DateParseHandling.None,
};
}
}
这是我从 VS2017 收到的错误消息。
JsonSerializationException:无法将当前 JSON 对象(例如 {"name":"value"})反序列化为类型“ZKILLBOARDDATA.GettingStarted[]”,因为该类型需要 JSON 数组(例如 [1,2,3])才能正确反序列化。
要修复此错误,请将 JSON 更改为 JSON 数组(例如 [1,2,3])或更改反序列化类型,使其成为普通的 .NET 类型(例如,不是像整数这样的原始类型,而不是像这样的集合类型)可以从 JSON 对象反序列化的数组或列表)。 JsonObjectAttribute 也可以添加到类型中以强制它从 JSON 对象反序列化。
路径“allTimeSum”,第 1 行,位置 14。
尝试这个
var remoteUri = "https://zkillboard.com/api/stats/characterID/224802743/";
var myWebClient = new WebClient();
myWebClient.Headers.Add("user-agent", "C# App testing");
myWebClient.Headers.Add("content-type", "application/json");
var jsonString = myWebClient.DownloadStringTaskAsync(remoteUri).Result;
var obj = JsonConvert.DeserializeObject(jsonString);
//OR
var obj = JsonConvert.DeserializeObject<YourModel>(jsonString);
我认为你的模型中不需要这个
public partial class GettingStarted
{
public static GettingStarted[] FromJson(string json) => JsonConvert.DeserializeObject<GettingStarted[]>(json, Converter.Settings);
}
public static class Serialize
{
public static string ToJson(this GettingStarted[] self) => JsonConvert.SerializeObject(self, Converter.Settings);
}
public class Converter
{
public static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
{
MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
DateParseHandling = DateParseHandling.None,
};
}
我有同样的问题; 我通过使用新的默认System.Text.Json.JsonSerializer.Deserialize
而不是Newtonsoft
解决了它
using System.Text.Json;
var obj = JsonSerializer.Deserialize<YourMODEL>(jsonStr);
ps https://quicktype.io很棒(虽然对于 C# 来说似乎有些过时); 我也试过http://json2csharp.com但我的 json 文件很大而且它冻结了。
有时(特别是对于深度嵌套的复杂 json)quicktype 不添加列表/数组类型; 例如MyObj
而不是List<MyObj>
。 有时可以通过先选择 T[] 然后从网站的生成菜单选项Use T[] or List<T>
来“修复”它。
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