Question

我是C＃和Visualstudio2017的新手，并且已经坚持了几周。搜索网但没有找到与此相关的结果，我可以正确理解。我想要做的是从中获取json数据 https://zkillboard.com/api/stats/characterID/224802743/ 然后将其转换为可以获取的可用数据，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。

MainForm.cs

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);
        }   
    }
}

的 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,
        };
    }
}

以下是我从VS2017收到的错误消息。

JsonSerializationException：无法将当前JSON对象（例如{＆＃34; name＆＃34;：＆＃34; value＆＃34;}）反序列化为类型＆＃39; ZKILLBOARDDATA.GettingStarted []＆＃39;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，不是像整数这样的基本类型，而不是可以从JSON对象反序列化的集合类型，如数组或List）。 JsonObjectAttribute也可以添加到类型中以强制它从JSON对象反序列化。

路径＆＃39; allTimeSum＆＃39;，第1行，第14位。

Answer 1

试试这个

     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,
        };
    }

Answer 2

我遇到了同样的问题；我通过使用新的默认 where (@departmentID is null) or (@divisionID is null and DepartmentID = @departmentID) or (DepartmentID = @departmentID and DivisionID = @divisionID) 而不是 System.Text.Json.JsonSerializer.Deserialize's

解决了这个问题

Newtonsoft

附言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using System.Text.Json; var obj = JsonSerializer.Deserialize<YourMODEL>(jsonStr); 而不是 MyObj。有时可以通过先选择 T[] 然后从网站的生成菜单选项 List<MyObj> 中列出来“修复”它。

JsonSerializationException：无法反序列化当前的JSON对象

2 个答案: