Cannot serialize inherited property into JSON via Json.Net

Question

I am using C# .NET 4.0 and Newtonsoft JSON 4.5.0.11

    [JsonObject(MemberSerialization.OptIn)]
    public interface IProduct
    {
        [JsonProperty(PropertyName = "ProductId")]
        int Id { get; set; }
        [JsonProperty]
        string Name { get; set; }
    }

    public abstract class BaseEntity<T>
    {
        private object _id;

        public T Id
        {
            get { return (T)_id; }
            set { _id = value; }
        }
    }

    public class Product : BaseEntity<int>, IProduct
    {
        public string Name { get; set; }
        public int Quantity { get; set; }
    }

I need to serialize part of object and I use interfaces with declared concrete properties to do this.

The serialization looks like:

Product product = new Product { Id = 1, Name = "My Product", Quantity = 5};
JsonConvert.SerializeObject(product);

Expected result is:

{"ProductId": 1, "Name": "My Product"}

But actual result is:

{"Name": "My Product"}

How can I serialize this object correctly?

UPD: Looked at the source code of json.net and came to the conclusion that this is a bug with grab information about object through ReflectionUtils.

Alex Filipovici · Accepted Answer · 2012-12-11 09:53:43Z

1

Have you tried this?

public interface IProduct
{
    int Id { get; set; }
    string Name { get; set; }
}

[JsonObject(MemberSerialization.OptIn)]
public abstract class BaseEntity<T>
{
    private object _id;
    [JsonProperty]
    public T Id
    {
        get { return (T)_id; }
        set { _id = value; }
    }
}

[JsonObject(MemberSerialization.OptIn)]
public class Product : BaseEntity<int>, IProduct
{
    [JsonProperty]
    public string Name { get; set; }
    [JsonProperty]
    public int Quantity { get; set; }
}

answered Dec 11, 2012 at 9:53

Alex Filipovici

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1 Comment

Fightcat Over a year ago

I wouldn't want to use JsonProperty and JsonObject in a base class, because it placed in another project (library), which doesn't have reference to Newtonsoft JSON dll.

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