Json反序列化问题c#

本文关键字：问题 反序列化 Json | 更新日期: 2023-09-27 18:26:50

我想尝试反序列化以下Facebook帖子响应：

"data": [
    {
      "id": "...", 
      "from": {
        "category": "Local business", 
        "name": "...", 
        "id": "..."
      }, 
      "message": "...", 
      "picture": "...", 
      "likes": {
        "data": [
          {
            "id": "...", 
            "name": "..."
          }, 
          {
            "id": "...", 
            "name": "..."
        ]
      }
    }
]

后模型类为：

public class Post
{
  public string Id { get; set; }
  public From From { get; set; }
  public string Message { get; set; }
  public string Picture { get; set; }
  [JsonProperty("likes.data")]      <===== why this is not working??
  public List<Like> Likes { get; set; }
}

类似型号类

public class Like
{
    public string Id { get; set; }
    public string Name { get; set; }
}

在反序列化json时，我想将likes.data条目映射到likes列表。我该怎么做？？

Json反序列化问题c#

您可以使用Newtonsoft.Json来反序列化Json。

Newtonsoft.Json.JsonConvert.DeserializeObject("{'"data'": [...]")

您可以使用DataContractJsonSerializer（System.Runtime.Serialization）来反序列化这个：

使用以下内容反序列化：

using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
var jsonString = "{'"data'":[{'"id'":'"...'",'"from'":{'"category'":'"Local business'",'"name'":'"...'",'"id'":'"...'"},'"message'":'"...'",'"picture'":'"...'",'"likes'":{'"data'":[{'"id'":'"...'",'"name'":'"...'"},{'"id'":'"...'",'"name'":'"...'"}]}}]}";
var jsonSerializer = new DataContractJsonSerializer(typeof(JsonRoot));
JsonRoot json = null;
using(var stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
{
    stream.Position = 0;
    json = (JsonRoot)jsonSerializer.ReadObject(stream);
}

使用以下类型：

[DataContract]
public class JsonRoot
{
    [DataMember(Name="data")]
    public List<Post> Data { get; set; }
}
[DataContract]
public class Post
{
    [DataMember(Name="id")]
    public string Id { get; set; }
    [DataMember(Name="from")]
    public From From { get; set; }
    [DataMember(Name="message")]
    public string Message { get; set; }
    [DataMember(Name="picture")]
    public string Picture { get; set; }
    [DataMember(Name="likes")]
    public DataContainer Likes { get; set; }
}
[DataContract]
public class DataContainer
{
    [DataMember(Name="data")]
    public List<Like> Data { get; set; }
}
[DataContract]
public class From
{
    [DataMember(Name="category")]
    public string Category { get; set; }
    [DataMember(Name="name")]
    public string Name { get; set; }
    [DataMember(Name="id")]
    public string Id { get; set; }
}
[DataContract]
public class Like
{
    [DataMember(Name="id")]
    public string Id { get; set; }
    [DataMember(Name="name")]
    public string Name { get; set; }
}

同样的基本结构也应该适用于NewtonsoftJson库，但您需要切换出具有相应Newtonsoft替代项的属性。

或者，感谢：

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Text.Json; // Repo: https://github.com/ysharplanguage/FastJsonParser

你也可以写：

    public class From
    {
        public string id { get; set; }
        public string name { get; set; }
        public string category { get; set; }
    }
    public class Post
    {
      public string id { get; set; }
      public From from { get; set; }
      public string message { get; set; }
      public string picture { get; set; }
      public Dictionary<string, Like[]> likes { get; set; }
    } 
    public class Like
    {
        public string id { get; set; }
        public string name { get; set; }
    }

和：

        var SO_26426594_input = @"{ ""data"": [
{
  ""id"": ""post 1"", 
  ""from"": {
    ""category"": ""Local business"", 
    ""name"": ""..."", 
    ""id"": ""...""
  }, 
  ""message"": ""..."", 
  ""picture"": ""..."", 
  ""likes"": {
    ""data"": [
      {
        ""id"": ""like 1"", 
        ""name"": ""text 1...""
      }, 
      {
        ""id"": ""like 2"", 
        ""name"": ""text 2...""
      }
    ]
  }
} ] }";
        var posts = new JsonParser().Parse<Dictionary<string, Post[]>>(SO_26426594_input);

测试/验证：

        System.Diagnostics.Debug.Assert(posts != null && posts["data"][0].id == "post 1");
        System.Diagnostics.Debug.Assert(posts != null && posts["data"][0].from.category == "Local business");
        System.Diagnostics.Debug.Assert(posts != null && posts["data"][0].likes["data"][0].id == "like 1");
        System.Diagnostics.Debug.Assert(posts != null && posts["data"][0].likes["data"][1].id == "like 2");

使用：

System.Text.Json(https://www.nuget.org/packages/System.Text.Json)

'HTH，

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