Remove null properties of an object sent to Json MVC

Question

namespace Booking.Areas.Golfy.Models
{
    public class Time
    {
        public string   time            { get; set; }
            


        

Answer 1

You can't use the default Json ActionResult to remove null properties.

You can take a look at JSON.NET, it has an attribute that you can set to remove the property if it is null

[JsonProperty(NullValueHandling=NullValueHandling.Ignore)]

Or if you don't want to use other libraries you can create your own json custom ActionResult and register a new converter for the default JavaScriptSerializer, like this:

public class JsonWithoutNullPropertiesResult : ActionResult
{
    private object Data { get; set; }

    public JsonWithoutNullPropertiesResult(object data)
    {
        Data = data;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        HttpResponseBase response = context.HttpContext.Response;
        response.ContentType = "application/x-javascript";
        response.ContentEncoding = Encoding.UTF8;

        if (Data != null)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            serializer.RegisterConverters(new[] { new NullPropertiesConverter() });
            string ser = serializer.Serialize(Data);
            response.Write(ser);
        }
    }
}

public class NullPropertiesConverter : JavaScriptConverter
{
    public override IDictionary Serialize(object obj, JavaScriptSerializer serializer)
    {
        var toSerialize = new Dictionary();

        foreach (var prop in obj.GetType()
                                .GetProperties(BindingFlags.Instance | BindingFlags.Public)
                                .Select(p => new
                                {
                                    Name = p.Name,
                                    Value = p.GetValue(obj)
                                })
                                .Where(p => p.Value != null))
        {
            toSerialize.Add(prop.Name, prop.Value);
        }

        return toSerialize;
    }

    public override object Deserialize(IDictionary dictionary, Type type, JavaScriptSerializer serializer)
    {
        throw new NotImplementedException();
    }

    public override IEnumerable SupportedTypes
    {
        get { return GetType().Assembly.GetTypes(); }
    }
}

And now in your view:

public ActionResult Index()
{
    Teetimes r = BookingManager.GetBookings();
    return new JsonWithoutNullPropertiesResult(t);
}