How to check whether json object has some property

Question

In Java there is a nice method has that makes it possible to check whether a json object contains a key or not. I use it like so:

JSONObject obj = ....; // <- got by some procedure
if(obj.has("some_key")){
    // do something
}

I could not find the same cool functionality in newtonsoft.json library for C#. So, I wonder what are the alternatives. Thanks!

Maraboc · Accepted Answer · 2015-11-04 09:10:34Z

31

Just use obj["proprty_name"]. If the property doesn't exist, it returns null

if(obj["proprty_name"] != null){
    // do something
}

answered Nov 4, 2015 at 9:10

Maraboc

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Comments

Rahul Tripathi · Accepted Answer · 2015-11-04 09:12:40Z

8

You can try like this:

IDictionary<string, JToken> dict = x;
if (dict.ContainsKey("some_key"))

since JSONObject implements IDictionary<string, JToken>. You can refer MSDN for details

answered Nov 4, 2015 at 9:12

Rahul Tripathi

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He's using Newtonsoft.Json not System.Json

karthik loganathan · Accepted Answer · 2019-06-13 00:25:02Z

-3

Use this JToken.ContainsKey() This should work.

answered Jun 13, 2019 at 0:25

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