如何使用json.net将额外的属性添加到序列化的JSON字符串中? [英] How to add an extra property into a serialized JSON string using json.net?

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问题描述

我正在MVC 4程序中使用Json.net.

I am using Json.net in my MVC 4 program.

我有一个类Item的对象item.

我做到了: string j = JsonConvert.SerializeObject(item);

现在,我想在j中添加一个额外的属性,例如"feeClass" : "A".

Now I want to add an extra property, like "feeClass" : "A" into j.

我如何使用Json.net来实现这一目标?

How can I use Json.net to achieve this?

推荐答案

您有一些选择.

@Manvik建议,最简单的方法就是在类中添加另一个属性,并在序列化之前设置其值.

The easiest way, as @Manvik suggested, is simply to add another property to your class and set its value prior to serializing.

如果您不想这样做,下一个最简单的方法是将您的对象加载到JObject中,附加新的属性值,然后从那里写出JSON.这是一个简单的示例:

If you don't want to do that, the next easiest way is to load your object into a JObject, append the new property value, then write out the JSON from there. Here is a simple example:

class Item
{
    public int ID { get; set; }
    public string Name { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        Item item = new Item { ID = 1234, Name = "FooBar" };
        JObject jo = JObject.FromObject(item);
        jo.Add("feeClass", "A");
        string json = jo.ToString();
        Console.WriteLine(json);
    }
}

以下是上面的输出:

{
  "ID": 1234,
  "Name": "FooBar",
  "feeClass": "A"
}

另一种可能性是创建自定义 JsonConverter 作为您的Item类,并在序列化过程中使用它. JsonConverter允许您完全控制特定类在序列化过程中写入的内容.您可以根据需要添加属性,抑制属性,甚至写出不同的结构.对于这种特殊情况,我认为这可能是矫kill过正,但这是另一种选择.

Another possibility is to create a custom JsonConverter for your Item class and use that during serialization. A JsonConverter allows you to have complete control over what gets written during the serialization process for a particular class. You can add properties, suppress properties, or even write out a different structure if you want. For this particular situation, I think it is probably overkill, but it is another option.

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