How do you add a JToken to an JObject?
c#, json.net
Solution
I think you're getting confused about what can hold what in JSON.Net.
- 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.
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.
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""}"));
Problem
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" } } } } ``` 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); ``` But this gives the error: `"Newtonsoft.Json.Linq.JProperty cannot have multiple values."` 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.