Parse JSON to C# object

Question

static void Main(string[] args)
{
    var json = @"{ ""rows"": [
                [
                    {
                        ""colspan"": 4,
                        ""id"": ""ContentPanel1""
                    },
                    {
                        ""colspan"": 8,
                        ""id"": ""ContentPanel2""
                    }
                ],
                [
                    {
                        ""colspan"": 12,
                        ""id"": ""ContentPanel3""
                    }
                ]
            ]}";

    var json_serializer = new JavaScriptSerializer();
    var jsonData = json_serializer.Deserialize<Grid>(json);

    Console.ReadKey();
}

[Serializable]
public class Grid
{
    public List<Row> rows { get; set; }
}

[Serializable]
public class Row
{
    public int colspan { get; set; }
    public int id { get; set; }
    public List<Row> rows { get; set; }
}

I am trying to convert this JSON string to a C# object, but I am finding it hard because the error message is not very intuitive. Any JSON punters please help!

ERROR Type 'ConsoleApplication1.Program+Row' is not supported for deserialization of an array.

As unintuitive as the error message is, it's even less useful if you don't tell us what it is. — Rawling
– Rawling, Commented Oct 23, 2012 at 10:03
Do you have the web essentials for visual studio? madskristensen.net/post/Web-Essentials-2012-released.aspx it has a feature Paste JSON As Classes which makes it awesome to parse — JP Hellemons
– JP Hellemons, Commented Oct 23, 2012 at 10:06
I have parsed the JSON using an online JSON raeder and the JSOn seems fine.. — chugh97
– chugh97, Commented Oct 23, 2012 at 10:08
You might want to look at JSON.NET and the JObject/JValue features in it, that don't require that you create a fixed structure for your imported JSON, but rather uses dynamic structure values. It's much easier than mapping types exactly especially if you only need a few items out of the data. More info here: west-wind.com/weblog/posts/2012/Aug/30/… — Rick Strahl
– Rick Strahl, Commented Oct 23, 2012 at 10:10

Marc Gravell · Accepted Answer · 2012-10-23 10:04:45Z

4

First we get:

Type 'Row' is not supported for deserialization of an array.

The JSON with [ [ shows a nested array. So either change the JSON, or make rows a Row[][]:

public Row[][] rows { get; set; }

Now we get:

ContentPanel1 is not a valid value for Int32.

well...

public int id { get; set; }

vs

""id"": ""ContentPanel1""

Now: "ContentPanel1" is not an int. Make id a string:

public string id { get; set; }

answered Oct 23, 2012 at 10:04

Marc Gravell

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