問題描述

我仔細閱讀了文檔、StackOverflow 等，似乎找不到這個...

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

我想做的是將一個簡單的值類型的對象序列化/反序列化為一個值，而不是一個對象，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);

我想要的是讓 json 像這樣序列化:

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 成為嵌套對象的地方，例如:

Not where the ip becomes a nested object, ex:

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

有人知道怎么做嗎?謝謝！(P.S. 我在一個龐大的遺留 .NET 代碼庫上使用 Json 序列化，所以我無法真正更改任何現有類型，但我可以擴充/分解/裝飾它們以促進 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.)

推薦答案

您可以使用 IPAddress 類的自定義 JsonConverter 來處理這個問題.這是您需要的代碼:

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，將 [JsonConverter] 屬性添加到您的 IPAddress 類中，您就可以開始了:

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()); 
    }
}

這是一個工作演示:

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; }
}

輸出:

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

這篇關于Json.net 如何將對象序列化為值的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！