C# json object with empty json array

Question

I have a returned json object that contains an empty json array

{[]}

EDIT:

How do I check this in an if statement?

        string arrayData = string.Empty;

        if (response.Contains("\"data\":"))
        {
            JToken root = JObject.Parse(response);
            JToken data = root["data"];
            if (data != null)
            {
                arrayData = data.ToString();
            }
        }
        else
        {
            arrayData = response;
        }

        var responseDatas = JsonConvert.DeserializeObject<dynamic>(arrayData);

Here, responseDatas is now

{[]}

I don't think it's a valid json string.

Cheng Chen
– Cheng Chen

2016-06-28 08:19:07 +00:00
Commented Jun 28, 2016 at 8:19 — Cheng Chen
– Cheng Chen, Commented Jun 28, 2016 at 8:19
I am sure it is not ;) @DannyChen

Patrick Hofman
– Patrick Hofman

2016-06-28 08:20:28 +00:00
Commented Jun 28, 2016 at 8:20 — Patrick Hofman
– Patrick Hofman, Commented Jun 28, 2016 at 8:20

Patrick Hofman · Accepted Answer · 2016-06-28 08:20:12Z

9

First, that is invalid JSON. The array should have a name, like this:

{ list: [] }

Second, you can deserialize the JSON using JSON.NET and then test the result:

public class ClassWithList
{
    public List<object> list { get; set; }
}

var o = JsonConvert.DeserializeObject<ClassWithList>(json);

if (o.list != null && o.list.Count > 0)
{ }

answered Jun 28, 2016 at 8:20

Patrick Hofman

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1 Comment

user3663854 Over a year ago

thanks! exactly what I needed, checking o.list.Count is the solution. I love stackoverflow... :)

Mike · Accepted Answer · 2019-06-05 15:00:18Z

1

The json is invalid (in the original question and in the accepted answer). You should include double quotes ...

{
    "list": []
}

answered Jun 5, 2019 at 15:00

Mike

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