Parsing JSON object containing an array with Windows Phone 7

Question

Ok, I'm having some difficult with this.

My JSON is like

{ "names" : [ {"name":"bla"} , {"name":"bla2"} ] }

I was trying to do this tutorial but, due to the different JSON, it didn't worked.

What do I have to put inside this method? I don't know if it's better to create a "wrap" class that contain my list or using directly a JsonObject. Could you provide me a snippet? I'm kinda new in C#.

void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {
        DataContractJsonSerializer ser = null;
        try
        {
           ???
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Thanks in advance!

json2csharp.com will be your friend. It creates classes and members according to a JSON String. It saves a lot time! — Gero
– Gero, Commented May 1, 2012 at 20:23

L.B · Accepted Answer · 2012-05-01 19:47:05Z

6

Using Json.Net (which supports Windows Phone)

string json = @"{ ""names"" : [ {""name"":""bla""} , {""name"":""bla2""} ] }";

var dict = (JObject)JsonConvert.DeserializeObject(json);
foreach (var obj in dict["names"])
{
    Console.WriteLine(obj["name"]);
}

Or if you want to use it in a type-safe way

var dict = JsonConvert.DeserializeObject<RootClass>(json);
foreach (var obj in dict.names)
{
    Console.WriteLine(obj.name);
}


public class RootClass
{
    public MyName[] names { get; set; }
}

public class MyName
{
    public string name { get; set; }
}

edited May 1, 2012 at 19:47

answered May 1, 2012 at 19:33

L.B

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2 Comments

L.B Over a year ago

@Mike_G OP doesn't use DataContractJsonSerializer either. I see only DataContractJsonSerializer ser = null; Is this the only explanation of your downvote for a working code ?

Enrichman Over a year ago

Yes, it works! Thanks a lot! If anybody need a string (like me) just put obj["name"].ToString(). Maybe it's something noob but, as I said, I'm new in C#!

Sascha · Accepted Answer · 2012-05-01 19:42:01Z

1

I'm using JSON.NET ( http://james.newtonking.com/projects/json-net.aspx ) normally, so my code might vary a bit.

For the list content I would go for a class with a name property like that:

public class NameClass {
    public string name { get;set; }
}

Then you should be able to deserialize with JSON.NET a List<NameClass>:

List<NameClass> result = JsonConvert.Deserialize<List<NameClass>>(jsonString);

This is written out of my head, so maybe, it doesn't compile with copy and paste, but it should work as a sample.

edited May 1, 2012 at 19:42

answered May 1, 2012 at 19:29

Sascha

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2 Comments

L.B Over a year ago

-1 Doesn't work since OP's json string is not an array or a List. Easy to test

Sascha Over a year ago

Have overseen the need for a root class. @L.B: Thanks for pointing this out

Mike_G · Accepted Answer · 2012-05-01 21:17:55Z

1

Using the .NET DataContractJsonSerializer you will need to define a class that maps the json objects. Something like this (if i remember correctly):

/// <summary>
/// 
/// </summary>
[DataContract]
public class Result
{
    /// <summary>
    /// 
    /// </summary>
    [DataMember(Name = "name")]
    public string Name
    { get; set; }
}

 /// <summary>
/// 
/// </summary>
[DataContract]
public class Results
{
    /// <summary>
    /// 
    /// </summary>
    [DataMember(Name = "names")]
    public List<Result> Names
    { get; set; }
}

then in your event handler:

DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Results));
var results = (Results)serializer.ReadObject(SOME OBJECT HOLDING JSON, USUALLY A STREAM);

edited May 1, 2012 at 21:17

answered May 1, 2012 at 19:43

Mike_G

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3 Comments

L.B Over a year ago

-1 Doesn't work since OP's json string is not an array or a List. Easy to test.

Mike_G Over a year ago

of course it doesnt work, its not a program lol. he wasnt wanting it done for him, he asked what to do next. As you can see, i demonstrated to two major components for completely his task. Lol, some people....

L.B Over a year ago

Your answer was trying to deserialize OP's json string to a List not to a root object and you say now of course it doesnt work. Good policy to answer. Just write anything random, since you don't expect it to run. LOL

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