Parse a Json String to create a new custom object c#

Question

I am returning a json string to a WebMethod in WebForms and I want to take the json string and parse it into custom Order objects.

I have a class:

public class Order
{
    public string Item { get; set; }
    public string Color { get; set; }
    public string Qty { get; set; }
    public string Size { get; set; }
}

And a WebMethod:

[WebMethod]
public static string SendOrder(string json)
{
    List<Order> orders = new List<Order>();

    return json;
}

I am passing this string:

{
    json: [
        {
            "Item":"Nike Polo #286772 - Women's Dri-FIT Micro Pique Short Sleeved Polo",
            "Size":"XL",
            "Color":"Light Blue",
            "Quantity":"3"
        },
        {
            "Item":"Port Authority Women's Jacket #L790 - Black",
            "Size":"Medium",
            "Color":"Black",
            "Quantity":"3"
        }
    ]
}

I want to loop through this string and creating new Orders.

What is the best way to do this?

Okay, I have added that reference and I am working on parsing the string into the objects. — user3788671
– user3788671, Commented May 11, 2015 at 18:04
This is how i would parse the json right: var orders = JsonConvert.DeserializeObject<List<Order>>(json); — user3788671
– user3788671, Commented May 11, 2015 at 18:08

Craig W. · Accepted Answer · 2015-05-11 17:57:37Z

2

That JSON is a little oddly formatted as it maps to the following classes (using http://json2csharp.com):

public class Json
{
    public string Item { get; set; }
    public string Size { get; set; }
    public string Color { get; set; }
    public string Quantity { get; set; }
}

public class RootObject
{
    public List<Json> json { get; set; }
}

I'm not sure why you have a top-level variable named json, but whatever.

At this point just use JSON.NET to deserialize into the structure.

JsonConvert.DeserializeObject<RootObject>(yourJsonString);

If you want to rename the object from Json to Order you'll need to use an attribute for that. I don't recall the name off the top of my head but it should be easy to find in the JSON.NET documentation.

answered May 11, 2015 at 17:57

Craig W.

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Comments

jeffkempf · Accepted Answer · 2015-05-11 19:28:43Z

I recently completed a Windows Phone app that retrieved info from a Web API-based server as Json strings. I ended up using the JsonConvert class to convert my lists of objects from Json strings to my custom objects. Here's an example of one of my client-side methods that receives and converts the Json strings:

public async void GetGames()
    {
        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("base url");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = await client.GetAsync("specific url extention (like api/Order)");

            if (response.IsSuccessStatusCode)
            {
                string s = await response.Content.ReadAsStringAsync();
                var deserializedResponse = JsonConvert.DeserializeObject<List<Order>>(s);
//rest of code


            }
        }
    }

Also, make sure that your web method is actually doing something. The example web method you posted creates creates a new list then just returns the parameter you passed in. Using Web API, you could return a list of all Order objects in your database via a method similar to the following:

public IQueryable<Order> GetOrders()
    {
        return db.Orders; //db is an instance of your DbContext class
    }

I hope this is helpful. Let me know if you have any questions.

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