CODEWITHSUNDEEP
c#jsonfirebasexamarinfirebase-realtime-database
CodeName
CodeName

Reputation: 579

Deserialize JSON into readable format

I am now working on a Xamarin project and I am using Firebase as my database.

I have a set of data as following:

sample data

I have managed to retrieve the data via RESTful service. However, when I tried to JsonConvert.Deserialize them, I am faced with an error telling me that I cannot convert to .NET Collection.

Is there a way I can do it?

My Model

public class TodoItem
{
    public string ID { get; set; }

    public string Name { get; set; }

    public string Notes { get; set; }

    public bool Done { get; set; }

}

Retrieving from RESTful service

public async Task<List<TodoItem>> RefreshDataAsync()
{
    Items = new List<TodoItem>();

    //RestUrl = refer to constants.cs
    var uri = new Uri(string.Format(Constants.RestUrl, string.Empty));

    try
    {
        var response = await client.GetAsync(uri);
        if (response.IsSuccessStatusCode)
        {
            var content = await response.Content.ReadAsStringAsync();
            Items = JsonConvert.DeserializeObject<List<TodoItem>>(content);
        }
    }
    catch (Exception ex)
    {
        Debug.WriteLine(@"              ERROR{0}", ex.Message);
    }

    return Items;
}

UI

listView.ItemsSource = await App.TodoManager.GetTasksAsync();

Update

What's in the content of variable content

{\"-L9K-8AF9fxZfe6bwTjk\":{\"Done\":false,\"ID\":\"323642ac-89e2-4f14-b9b0-e9b7306aee81\",\"Name\":\"ufhd\",\"Notes\":\"nvnv\"},\"-L9K07oNjtvPQYbdyItU\":{\"Done\":false,\"ID\":\"c7a53ad2-533f-454c-9ac0-5b21c3d2669c\",\"Name\":\"abc\",\"Notes\":\"cde\"},\"-L9K1n1r7Q7ZIgA3KFaD\":{\"Done\":false,\"ID\":\"938bd62f-f117-4733-a1e4-a4ed22233ca3\",\"Name\":\"ffef\",\"Notes\":\"dfg\"}}

Upvotes: 1

Views: 759

Answers (2)

Romeo Sierra
Romeo Sierra

Reputation: 1756

This is more of a complement to Evk's answer.

I have taken the liberty of minifying your example dataset for the sake of brevity. This little example I have verified for the functionality.

class Program
{
    static void Main(string[] args)
    {
        var JSONStr = "{\"user\":{\"L9k0\":{\"ID\":\"001\", \"name\":\"somename\"},\"L9k1\":{\"ID\":\"002\", \"name\":\"someothername\"}}}";
        var res = JsonConvert.DeserializeObject<JsonResult>(JSONStr);
        Console.ReadLine();
    }
}
class JsonResult {
    public Dictionary<string, ToDoItem> user { get; set; }
}

class ToDoItem {
    public string ID { get; set; }
    public string name { get; set; }
}

Upvotes: 1

Evk
Evk

Reputation: 101563

As you can see from both first screenshot and from your json string - json you receive does not actually represent a collection. It's an object with cryptic properties, each property represents one todo item.

So you need to deserialize it as dictionary:

JsonConvert.DeserializeObject<Dictionary<string, TodoItem>>(content);

If you don't care about those cryptic property names, you can do:

Items = JsonConvert.DeserializeObject<Dictionary<string, TodoItem>>(content).Values.ToList()

Upvotes: 6

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