如何将一组 JSON 个对象转换为 C# 列表

Question

我有一个 JSON 文件，看起来像这样：

{
    "foo": "bar",
    "pets": {
        "dog": {
            "name": "spot",
            "age": "3"
        },
        "cat": {
            "name": "wendy",
            "age": "2"
        }
    }
}

我想将其反序列化为 C# class:

public class PetObject
{
    [JsonProperty("name")]
    public string Name { get; set; }

    [JsonProperty("age")]
    public string Age { get; set; }
}

public class FooObject
{
    [JsonProperty("foo")]
    public string Foo { get; set; }

    [JsonProperty("pets")]
    public List<PetObject> Pets { get; set; }
}

使用这样的代码进行转换是行不通的，因为 pets 内部有多个对象，并且不是 JSON 数组。

//does not work
FooObject content = JsonConvert.DeserializeObject<FooObject>(json);

这是例外情况：

Newtonsoft.Json.JsonSerializationException
  HResult=0x80131500
  Message=Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Test.PetObject]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path 'pets.dog', line 4, position 10.

有没有办法把pets对象里面的对象转换成对象数组？（除了在将 JSON 传递给 DeserializeObject 方法之前编辑它本身）

Answer 1

你的 json 而不是 说 "array of objects"。它说它有一个具有 dog 和 cat 属性的 pets 对象。所以像这样：

public class PetObject
{
    public string name { get; set; }
    public string age { get; set; }
}

public class Foo
{
    public string foo { get; set; }
    public Pets pets {get;set;}

}

public class Pets
{
    public PetObject dog { get; set; }
    public PetObject cat { get; set;}
}

public class Program
{
    public static void Main()
    {
        var json = "{\"foo\": \"bar\",\"pets\": {\"dog\": {\"name\": \"spot\",\"age\": \"3\"},\"cat\": {\"name\": \"wendy\",\"age\": \"2\"}}}"; 

        var content = JsonConvert.DeserializeObject<Foo>(json);

        Console.WriteLine(content.pets.dog.name);   

    }
}

第...

Answer 2

这里的结构很糟糕 json。但是，您可以使用 JsonProperty 属性反序列化它，如下所示：

class Program
{
    static void Main(string[] args)
    {
        string json = "{\"foo\": \"bar\",\"pets\": {\"dog\": {\"name\": \"spot\",\"age\": \"3\"},\"cat\": {\"name\": \"wendy\",\"age\": \"2\"}}}";
        Foo content = JsonConvert.DeserializeObject<Foo>(json);

        Console.Read();
    }
}

public class PetObject
{
   [JsonProperty("name")]
    public string Name { get; set; }

    [JsonProperty("age")]
    public string Age { get; set; }
}

public class Foo
{
    [JsonProperty("foo")]
    public string FooStr { get; set; }

    [JsonProperty("pets")]
    public Dictionary<string, PetObject> Pets { get; set; }
}

Answer 3

您的 JSON 文件包含宠物字典，而不是数组。所以，改变 FooObject class:

public class FooObject
{
    [JsonProperty("foo")]
    public string Foo { get; set; }

    [JsonProperty("pets")]
    public Dictionary<string, PetObject> Pets { get; set; }

    // if you still need a list of pets, use this
    public List<PetObject> PetsList => Pets.Values.ToList();
}

如何将一组 JSON 个对象转换为 C# 列表

How to Convert a Set of JSON Objects to C# List

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