Filtering Object values in C#

Question

i've got a C# web Api receiving the following object :

     "cars": {
       "bmw": true,
       "benz": false,
       "kia": true,
       "hyundai": false,
       "madza": false,
       "ford": false
   }

the class property is as follows :

 public CarsViewModel cars{ get; set; }

How can i get all the values that are true in the above object?

tried to convering the following object to list but didnt work like this : var cars = ((IEnumerable)cars).Cast<object>().ToList() — Silva
– Silva, Commented Jun 4, 2018 at 6:30
Your JSON isn't returning any form of IEnumerable (array / list / etc). It is returning a single object with a bunch of bool properties. — Adam G
– Adam G, Commented Jun 4, 2018 at 6:36
correct, i didnt want to go the long way of check each value if its true, i thought the is a better short way to handle it, maybe in the future i decide to add an extra car name. — Silva
– Silva, Commented Jun 4, 2018 at 6:40

1_bug · Accepted Answer · 2018-06-04 07:22:10Z

2

You can parse the received object into the dictionary and select the key only if value is true.

string json = "{\"bmw\": true,\"benz\": false,\"kia\": true,\"hyundai\": false,\"madza\": false,\"ford\": false}";
var dict = JsonConvert.DeserializeObject<Dictionary<string,bool>>(json);

List<string> cars = dict.Where(x=>x.Value).Select(y=>y.Key).ToList();

You can check the result by:

cars.ForEach(y => Console.Write("{0}\n", y));

PS. For serializing you have to use Newtonsoft.Json namespace.

edited Jun 4, 2018 at 7:22

answered Jun 4, 2018 at 7:12

1_bug

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2 Comments

nilsK Over a year ago

He, you were faster ... gist-link example

Silva Over a year ago

Thanks, had to JsonConvert.SerializeObject(cars) then DeserializeObject. works perfect but dont know if SerializeObject and DeserializeObject the same object is good code practices but thank you very much

Angappan.S · Accepted Answer · 2018-06-04 10:34:07Z

you try this code

 string jsonstring = "{\"cars\": {\"bmw\": \"true\", \"benz\": \"false\",  \"kia\": \"true\",  \"hyundai\": \"false\", \"madza\": \"false\",  \"ford\": \"false\"}}";
 dynamic data = JObject.Parse(jsonstring); 
 CarsViewModel obj = new CarsViewModel(); 
 var mydetails2 = JsonConvert.SerializeObject(data.cars);
 var mydetails3 = JsonConvert.DeserializeObject<Dictionary<string, bool>>(mydetails2);

  foreach (var pair in mydetails3)
    {
       // Console.WriteLine("{0}, {1}", pair.Key, pair.Value);
        if (pair.Value == true)
        {
            if (pair.Key == "bmw")
            {
                obj.bmw = pair.Value;
            }
            else if (pair.Key == "benz")
            {
                obj.benz = pair.Value;
            }
            else if (pair.Key == "kia")
            {
                obj.kia = pair.Value;
            }
            else if (pair.Key == "hyundai")
            {
                obj.hyundai = pair.Value;
            }
            else if (pair.Key == "madza")
            {
                obj.madza = pair.Value;
            }
            else if (pair.Key == "ford")
            {
                obj.ford = pair.Value;
            }

        }
    }

I hope its helpful to you..

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