how to loop over array of objects in c#

Question

I have this following json. I want to iterate over it and get the values of a and b so that i could set it at other place. Can anyone please tell me how to do this in c#? json is --

{
    "_id": "12345",
    "r": [
        "my-user",
        "college-student"
    ],
    "list": [
        {
            "a": "CSE",
            "b": "DataBase"
        },
        {
            "a": "IT",
            "b": "ComputerNetwork"
        }
    ]
}

Deserialize this JSON first into some readable object and then you can iterate over its length. — Dhrumil
– Dhrumil, Commented May 11, 2015 at 8:59
Check this: http://stackoverflow.com/questions/12676746/parse-json-string-in-c-sharp — Fabio
– Fabio, Commented May 11, 2015 at 9:00
@anonyms is a and b always "only" in the list part? And additionally HOW d you want the objects back as a list of strings,....? — Thomas
– Thomas, Commented May 11, 2015 at 9:00
Note that you don't need a custom class for this - JSON.Net's LINQ to JSON is fine for this sort of thing. Of course, if you want to represent the objects for anything else, it could definitely be useful to create a class... — Jon Skeet
– Jon Skeet, Commented May 11, 2015 at 9:01
I get this data using dictionary. internal static Dictionary<string, object> userData = null; i make some http call and userdata is the required json. i am using Newtonsoft for json conversion but no luck till now.. — anonyms
– anonyms, Commented May 11, 2015 at 9:22

Coder1409 · Accepted Answer · 2015-05-11 09:33:36Z

3

Install json.net from nuget and use this code to get a and b

        dynamic res = JObject.Parse(json);
        List<dynamic> ls =JsonConvert.DeserializeObject<List<dynamic>>( res.list.ToString());
        ls.ForEach(item=> Console.WriteLine(item.a+" "+item.b));

and since we love one liners just do the following

List<dynamic> res = JsonConvert.DeserializeObject<List<dynamic>>(((dynamic)(JObject.Parse(json))).list.ToString());

if you'd like to generate the class for the json just use this website http://json2csharp.com/

the class you would get is

public class List
{
    public string a { get; set; }
    public string b { get; set; }
}

public class RootObject
{
    public string _id { get; set; }
    public List<string> r { get; set; }
    public List<List> list { get; set; }
}

and deserialize by using :

var res = JsonConvert.DeserializeObject<RootObject>(json);

edited May 11, 2015 at 9:33

answered May 11, 2015 at 9:10

Coder1409

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5 Comments

JJJCoder Over a year ago

If you know the structure of the data coming in, you can make a corresponding C# class and deserialise to that to save using dynamic. i.e. JsonConvert.DeserializeObject<MyClass>. If you didn't want to use Json.Net, there is also a JavaScriptSerializer in System.Web.Extensions (msdn.microsoft.com/en-us/library/…). Have upvoted this answer as @Coder1409 is correct.

Coder1409 Over a year ago

He is just looking for the values of a and b to be saved somewhere else i don't see the importance of using a class here , either way i will add the class solution

anonyms Over a year ago

foreach (KeyValuePair<string, object> entry in App.userData) { if (entry.Key == "mnu") { //this.MenuItems.Add({branchtext = Value of a }) } }

anonyms Over a year ago

foreach (KeyValuePair<string, object> entry in App.userData) { if (entry.Key == "list") { //this.MenuItems.Add({branchtext = Value of a }) } }

Coder1409 Over a year ago

what are you trying to do here ??

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