如何將一組JSON對象轉換為C＃列表

Question

我有一個看起來像這樣的JSON文件：

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

我想將此反序列化為C＃類：

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; }
}

使用這樣的代碼進行轉換無法正常工作，因為pets內部有多個對象，並且不是JSON數組。

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

這是例外：

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.

有沒有一種方法可以將pets對象內部的對象轉換為對象數組？ （除了將JSON本身傳遞給DeserializeObject方法之前，還需要對其進行編輯）

Answer 1

這是構造錯誤的json。 但是，您可以使用JsonProperty屬性對其進行反序列化，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 2

您的JSON文件包含寵物字典，而不是數組。 因此，更改FooObject類：

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();
}

Answer 3

您的json 沒有說“對象數組” 。 它說，它有一個pets與對象dog和cat的特性。 所以像這樣：

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);   

    }
}

嗯...