How to deserialize JSON array of objects to c# structure

Question

I have a json string that was created from serializing an array of objects :

[
    {
        "html": "foo"
    },
    {
        "html": "bar"
    }
]

How can I deserialize it to some iterable C# structure ? I've tried this code, but I'm getting No parameterless constructor defined for type of 'System.String'. error :

string[] htmlArr = new JavaScriptSerializer().Deserialize<String[]>(html);

What I want to receive is an iterable structure to get each 'html' object.

Checkout this previous stackoverflow post, stackoverflow.com/questions/3142495/… or stackoverflow.com/questions/7895105/json-deserialize-c-sharp — MethodMan
– MethodMan, Commented Dec 30, 2012 at 23:09
thanks for the links, I was first trying to do this without creating an additional class but I can leave with it I guess :) — mike_hornbeck
– mike_hornbeck, Commented Dec 30, 2012 at 23:23

nekman · Accepted Answer · 2012-12-30 23:14:50Z

11

Use a class for each JSON object. Example:

public class HtmlItem
{
   [DataMember(Name = "html")]
   public string Html { get; set; }
}

JavaScriptSerializer ser = new JavaScriptSerializer();          

// Serialize
string html = ser.Serialize(new List<HtmlItem> {
   new HtmlItem {  Html = "foo" },
   new HtmlItem {  Html = "bar" }
});

// Deserialize and print the html items.        
List<HtmlItem> htmlList = ser.Deserialize<List<HtmlItem>>(html);
htmlList.ForEach((item) => Console.WriteLine(item.Html)); // foo bar

answered Dec 30, 2012 at 23:14

nekman

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2 Comments

mike_hornbeck Over a year ago

I accept your answer as I've finally used something similar from the link in the question comments. What is this DataMember decorator added for ?

nekman Over a year ago

Thanks! I think that the name in the DataMember attribute is used to mapp your JSON-property to your instance property. Read more about the DataMemberhere

Sergey Berezovskiy · Accepted Answer · 2012-12-30 23:13:19Z

4

You can use Newtonsoft Json.NET (available from NuGet)

string json = @"[{""html"": ""foo""},{""html"": ""bar""}]";
var items = JsonConvert.DeserializeObject<List<Item>>(json);

Where

public class Item
{
    public string Html { get; set; }
}

answered Dec 30, 2012 at 23:13

Sergey Berezovskiy

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Comments

evanmcdonnal · Accepted Answer · 2012-12-30 23:25:03Z

2

The docs site apparently isn't working right now... But I would try using JSON.NET ( http://james.newtonking.com/projects/json/help/ )

There are a couple of ways you can do it. You can deserialize in a very dynamic not type strict way or you can define an object that matches the json object exactly and deserialize into that. If there are many formats of JSON you'll have to serialize I would recommend using schemas.

edited Dec 30, 2012 at 23:25

answered Dec 30, 2012 at 23:15

evanmcdonnal

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Comments

L01NL · Accepted Answer · 2013-06-28 09:43:53Z

Answer of nekman is not completely correct, the attribute should be JsonPropery instead of DataMember. (in this case you can remove the attribute since the deserializer doesn't care about the capital H)

public class HtmlItem
{
   [JsonProperty("html")]
   public string Html { get; set; }
}

JavaScriptSerializer ser = new JavaScriptSerializer();          

// Serialize
string html = ser.Serialize(new List<HtmlItem> {
   new HtmlItem {  Html = "foo" },
   new HtmlItem {  Html = "bar" }
});

// Deserialize and print the html items.        
List<HtmlItem> htmlList = ser.Deserialize<List<HtmlItem>>(html);
htmlList.ForEach((item) => Console.WriteLine(item.Html)); // foo bar

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