C#-解析值{时遇到意外字符.路径'[0].统计 [英] C# - Unexpected character encountered while parsing value: {. Path '[0].Statistics

问题描述

我正在尝试使用以下代码根据我的模型反序列化JSON对象:

I am trying to deserialize a JSON object according to my model using the code below:

LoadData<MyModel>(Data.Stats, null);

public void LoadData<TModel>(string data, JsonSerializerSettings jsonSettings) where TModel : class
{
    var mockData = JsonConvert.DeserializeObject<Collection<TModel>>(data, jsonSettings); // ERROR HERE
    Context.SaveChanges();
}

但是我收到一条错误消息

However I am getting an error that reads

Newtonsoft.Json.JsonReaderException:'解析值时遇到意外字符:{.路径'[0] .Statistics'，第7行，位置19.'

Newtonsoft.Json.JsonReaderException: 'Unexpected character encountered while parsing value: {. Path '[0].Statistics', line 7, position 19.'

我的JSON对象是:

[
  {
    "Id": 3033,
    "Grade": 3,
    "Statistics": { //ERROR OCCURS ON THIS PROPERTY
      "Avatar.Add": 1,
      "TotalPlays": 36,
      "Game.TotalPlays.Spell_Mem_Words": 27,
      "Book.TotalReads.Count": 23,
      "Game.TotalPlays.Count": 39,
      "Character.TotalPlays.L": 23,
      "Character.TotalPlays.E": 3,
      "TotalPlays.Pick_Vocab": 16,
      "Character.TotalPlays.R": 22
    }
  }
]

对象模型是:

public class MyModel
{
    public int Id { get; set; }
    public int Grade { get; set; }
    public string Statistics { get; set; } 
}

我尝试过的事情

(1)使用json皮棉我已经确保json字符串有效.

(1) Using json lint I have ensured that the json string is valid.

(2)在javascript中使用环绕对象的序列号对对象进行序列化.反引号在C#中不起作用 JS小提琴

(2) In javascript serializing the object with back ticks surrounding it works. Backticks don't work in C# JS Fiddle

(3)试图使对象模型中的Statistics属性使用名为stats的类，而不是像这样的字符串

(3) Tried making the Statistics property in object model to use class called stats instead of string like

public class Stats 
{
    public string Label { get; set;}
    public int Value { get; set; }
}

(4)尝试了几乎所有此SO帖子中的答案

(4) Tried nearly all the answers on this SO post

很遗憾，我仍然没有解决此问题.有什么想法吗?

Unfortunately I still have not solved this issue. Any ideas?

推荐答案

我能够重现此MCVE的问题:

I was able to reproduce the problem with this MCVE:

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DeserializeJson
{
    /**
     * REFERENCE:
     * https://stackoverflow.com/questions/53562566/
     *
     * ORIGINAL ERROR:
     * "Unexpected character encountered while parsing value: {. Path '[0].Statistics', line 5, position 19."
     */
     public class Stats
     {
         public string Label { get; set; }
         public int Value { get; set; }
     }

     public class MyModel
     {
         public int Id { get; set; }
         public int Grade { get; set; }
         public string Statistics { get; set; }
     }

    class Program
    {
        static Collection<MyModel> LoadData(string data)
        {
            var retval = JsonConvert.DeserializeObject<Collection<MyModel>>(data);
            return retval;
        }

        static void Main(string[] args)
        {
            try
            {
                string s = File.ReadAllText(@"test-data.json");
                JsonConvert.DefaultSettings = () => new JsonSerializerSettings
                {
                    Formatting = Newtonsoft.Json.Formatting.Indented
                };
                Collection <MyModel> mockData = Program.LoadData(s);
                System.Console.WriteLine("#/items= " + mockData.Count);
                foreach (MyModel item in mockData)
                {
                    System.Console.WriteLine("  id= {0}, Grade={1}, Statistics={2}", item.Id, item.Grade, item.Statistics.ToString());
                }
            }
            catch (Exception ex)
            {
                System.Console.WriteLine("ERROR:", ex);
            }
        }
    }
}

我能够通过以下方式修复它:

I was able to fix it by:

1. 详细说明class Stats，然后

2. 在class MyModel的定义中使用统计信息:

1. Elaborating your definition of class Stats, then

2. Using Stats in the definition of class MyModel:

public class Stats
{
    public int AvatarAdd { get; set; }
    public int TotalPlays { get; set; }
    public int GameTotalPlaysSpellMemWords { get; set; }
    public int BookTotalReadsCount { get; set; }
    public int GameTotalPlaysCount { get; set; }
    public int CharacterTotalPlaysL { get; set; }
    public int CharacterTotalPlaysE { get; set; }
    public int TotalPlaysPick_Vocab { get; set; }
    public int CharacterTotalPlaysR { get; set; }
}

public class MyModel
{
    public int Id { get; set; }
    public int Grade { get; set; }
    public Stats Statistics { get; set; }
}

您有多种选择(包括逐字使用上述示例).我的建议是将统计"细分为较小的模型类.

You have several choices (including use the above example verbatim). My suggestion would be to break "Statistics" down into smaller model classes.

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