你如何添加一个JToken到JObject？ [英] How do you add a JToken to an JObject?

问题描述

我试图从一些文本添加一个JSON对象使用JSON.Net现有的JSON文件。例如，如果我有如下的JSON数据：

I'm trying to add a JSON object from some text to an existing JSON file using JSON.Net. For example if I have the JSON data as below:

  {
  "food": {
    "fruit": {
      "apple": {
        "colour": "red",
        "size": "small"
      },
      "orange": {
        "colour": "orange",
        "size": "large"
      }
    }
  }
}

我一直在试图做到这一点是这样的：

I've been trying to do this like this:

var foodJsonObj = JObject.Parse(jsonText);
var bananaJson = JObject.Parse(@"{ ""banana"" : { ""colour"": ""yellow"", ""size"": ""medium""}}");
var bananaToken = bananaJson as JToken;
foodJsonObj["food"]["fruit"]["orange"].AddAfterSelf(bananaToken);

但是，这给出了错误：Newtonsoft.Json.Linq.JProperty不能有多个值。

其实我已经尝试了几种不同的方法，但似乎无法取得任何进展。在我的例子我真正想要做的就是添加新的项目为果。请让我知道是否有这样做的更好的方式或简单的使用图书馆。

I've actually tried a few different ways but can't seem to get anywhere. In my example what I really want to do is add the new item to "fruit". Please let me know if there is a better way of doing this or a simpler library to use.

推荐答案

我想你弄不清什么可以在JSON.Net持有什么。

I think you're getting confused about what can hold what in JSON.Net.

• A JToken 是任何形式的JSON值的通用表示。这可能是一个字符串，对象，数组，财产等。


• A JProperty 是一个 JToken使用一个名称配对值。它只能被添加到 JObject ，其价值不能是另一个 JProperty 。


• A JObject 是 JProperties 的集合。它不能持有任何其他类型的 JToken 直接

• A JToken is a generic representation of a JSON value of any kind. It could be a string, object, array, property, etc.
• A JProperty is a single JToken value paired with a name. It can only be added to a JObject, and its value cannot be another JProperty.
• A JObject is a collection of JProperties. It cannot hold any other kind of JToken directly.

在你的代码，您正在尝试一个 JObject （包含香蕉的数据一）添加到 JProperty （橙色 ）已经有一个值（ JObject 包含 {色：橙色，大小：大} ）。正如你看到的，这将导致一个错误。

In your code, you are attempting to add a JObject (the one containing the "banana" data) to a JProperty ("orange") which already has a value (a JObject containing {"colour":"orange","size":"large"}). As you saw, this will result in an error.

你真的想要做的就是添加一个 JProperty 称为香蕉到 JObject 含有其他水果 JProperties 。下面是修改后的代码：

What you really want to do is add a JProperty called "banana" to the JObject which contains the other fruit JProperties. Here is the revised code:

JObject foodJsonObj = JObject.Parse(jsonText);
JObject fruits = foodJsonObj["food"]["fruit"] as JObject;
fruits.Add("banana", JObject.Parse(@"{""colour"":""yellow"",""size"":""medium""}"));

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