Question

我正在编写客户端应用程序，它应该处理服务器响应。回复是JSON。我决定使用Json.NET来反序列化它们。我无法简化或修改这些响应（在服务器端）。这种特定JSON响应的特殊困难是不同的对象类型在同一个数组中：散列和文件数组。所以，我想直接将这个数组反序列化为强类型对象，而不是对象数组。我认为应该可以用CustomCreationConverter来实现，但我无法想象如何。

JSON：

{
    "files":
    [
        "hash string",
        [
            ["first file name", 12],
            ["second file name", 34]
        ]
    ]
}

我想要实现的对象结构：

public class RootObject
{
    [JsonProperty("files")]
    public FilesContainer Container
    {
        get;
        set;
    }
}

public class FilesContainer
{
    public string Hash
    {
        get;
        set;
    }

    public File[] Files
    {
        get;
        set;
    }
}

[JsonConverter(typeof(FileJsonConverter))]
public class File
{
    public string Name
    {
        get;
        set;
    }

    public int Size
    {
        get;
        set;
    }
}

class FileJsonConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        throw new NotImplementedException();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        File obj = new File
        {
            Name = reader.ReadAsString(),
            Size = reader.ReadAsInt32().GetValueOrDefault()
        };

        reader.Read();

        return obj;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

Answer 1

我终于想出了如何做到这一点。我需要在serializer.Deserialize内使用JsonConverter。所以，这是一个有效的例子。

class Program
{
    static string json = @"{
                                ""files"":
                                [
                                    ""hash string"",
                                    [
                                        [""first file name"", 12],
                                        [""second file name"", 34]
                                    ]
                                ]
                            }";

    static void Main(string[] args)
    {
        RootObject container = JsonConvert.DeserializeObject<RootObject>(json);
    }
}

public class RootObject
{
    [JsonProperty("files")]
    public FilesContainer Container
    {
        get;
        set;
    }
}

[JsonConverter(typeof(FilesContainerJsonConverter))]
public class FilesContainer
{
    public string Hash
    {
        get;
        set;
    }

    public File[] Files
    {
        get;
        set;
    }
}

public class FilesContainerJsonConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        throw new NotImplementedException();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        FilesContainer obj = new FilesContainer();
        obj.Hash = reader.ReadAsString();
        reader.Read(); // to StartArray
        obj.Files = serializer.Deserialize<File[]>(reader);
        reader.Read(); // to EndArray

        return obj;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

[JsonConverter(typeof(FileJsonConverter))]
public class File
{
    public string Name
    {
        get;
        set;
    }

    public int Size
    {
        get;
        set;
    }
}

class FileJsonConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        throw new NotImplementedException();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        File obj = new File
        {
            Name = reader.ReadAsString(),
            Size = reader.ReadAsInt32().GetValueOrDefault()
        };

        reader.Read(); // to EndArray

        return obj;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

Json.NET：将嵌套数组反序列化为强类型对象

1 个答案: