JSON.net - Write into JSON / JObject using path string

Question

I have a little utility where we extract values from JSON using JObject.SelectToken(path). We need to determine the paths at run-time. Works perfectly.

What I now need to do is to write back into the JSON (JObject or other) using the same path string. I've hunted and searched and I can't quite find if there is anything that does this quite as cleanly as SelectToken does for reading.

(I'm also stuck in 3.5 CF)

For example, something like:

... JObject read in already ...

var theJToken = theJObject.SelectToken("animals.cat[3].name");
theTJoken.SetValue("Bob"); // Of course this doesn't exist

... serialize it ...

As my first "minuses", can you share why?

hvolmer
– hvolmer

2015-08-10 21:31:35 +00:00
Commented Aug 10, 2015 at 21:31 — hvolmer
– hvolmer, Commented Aug 10, 2015 at 21:31

poke · Accepted Answer · 2015-08-10 21:36:06Z

8

JToken.SelectToken actually returns a JToken which can be modified using JToken.Replace. You can use that to replace the node within your JSON object, mutating the original object.

JObject o = JObject.Parse(@"{ 'cats': [
                { 'name': 'cat 1' },
                { 'name': 'cat 2' },
                { 'name': 'cat 3' } ] }");

// get the token
JToken secondCatName = o.SelectToken("cats[1].name");

// replace the name
secondCatName.Replace("meow");

// and the original object has changed
Console.WriteLine(o.ToString());
// { "cats": [ { "name": "cat 1" }, { "name": "meow" }, { "name": "cat 3" } ] }

answered Aug 10, 2015 at 21:36

poke

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1 Comment

hvolmer Over a year ago

Thank you very much. That seems to have done the trick. I didn't see Replace() and might not have thought to use it because I didn't realize that the JToken would implicitly take a string or whatever I sent in. Always learning!

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