Json.net 如何将对象序列化为值

问题描述

我仔细阅读了文档、StackOverflow 等，似乎找不到这个...

I've pored through the docs, StackOverflow, etc., can't seem to find this...

我想做的是将一个简单的值类型的对象序列化/反序列化为一个值，而不是一个对象，如下所示:

What I want to do is serialize/deserialize a simple value-type of object as a value, not an object, as so:

public class IPAddress
{
    byte[] bytes;

    public override string ToString() {... etc.
}

public class SomeOuterObject
{
    string stringValue;
    IPAddress ipValue;
}

IPAddress ip = new IPAddress("192.168.1.2");
var obj = new SomeOuterObject() {stringValue = "Some String", ipValue = ip};
string json = JsonConverter.SerializeObject(obj);

我想要的是让 json 像这样序列化:

What I want is for the json to serialize like this:

// json = {"someString":"Some String","ipValue":"192.168.1.2"} <- value serialized as value, not subobject

不是 ip 成为嵌套对象的地方，例如:

Not where the ip becomes a nested object, ex:

// json = {"someString":"Some String","ipValue":{"value":"192.168.1.2"}}

有人知道怎么做吗?谢谢！(P.S. 我在一个庞大的遗留 .NET 代码库上使用 Json 序列化，所以我无法真正更改任何现有类型，但我可以扩充/分解/装饰它们以促进 Json 序列化.)

Does anyone know how to do this? Thanks! (P.S. I am bolting Json serialization on a large hairy legacy .NET codebase, so I can't really change any existing types, but I can augment/factor/decorate them to facilitate Json serialization.)

推荐答案

您可以使用 IPAddress 类的自定义 JsonConverter 来处理这个问题.这是您需要的代码:

You can handle this using a custom JsonConverter for the IPAddress class. Here is the code you would need:

public class IPAddressConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return (objectType == typeof(IPAddress));
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        return new IPAddress(JToken.Load(reader).ToString());
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        JToken.FromObject(value.ToString()).WriteTo(writer);
    }
}

然后，将 [JsonConverter] 属性添加到您的 IPAddress 类中，您就可以开始了:

Then, add a [JsonConverter] attribute to your IPAddress class and you're ready to go:

[JsonConverter(typeof(IPAddressConverter))]
public class IPAddress
{
    byte[] bytes;

    public IPAddress(string address)
    {
        bytes = address.Split('.').Select(s => byte.Parse(s)).ToArray();
    }

    public override string ToString() 
    { 
        return string.Join(".", bytes.Select(b => b.ToString()).ToArray()); 
    }
}

这是一个工作演示:

class Program
{
    static void Main(string[] args)
    {
        IPAddress ip = new IPAddress("192.168.1.2");
        var obj = new SomeOuterObject() { stringValue = "Some String", ipValue = ip };
        string json = JsonConvert.SerializeObject(obj);
        Console.WriteLine(json);
    }
}

public class SomeOuterObject
{
    public string stringValue { get; set; }
    public IPAddress ipValue { get; set; }
}

输出:

{"stringValue":"Some String","ipValue":"192.168.1.2"}

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