如果在Newtonsoft json中为null的对象，如何跳过序列化对象？

Question

I am using Json.net serializer for serializing objects.It is working perfectly.Now as per my requirement, I have used JsonDotNetCustomContractResolvers to exclude properties from an object.But for the below show object, I need to exclude all it properties.

Partial Public Class CreditCard
    <Key> _
    Public Property ID As Integer
    Public Property CustomerID As Integer
    Public Property CardType As String
    Public Property Last4Digit As String
    Public Property ExpiryDate As String
    Public Property Token As String
    Public Property IsPrimary As Boolean
End Class

And when I do that I get the result as I wanted. Result Shown in below image.

Here the properties are excluded, but the null object is still serialized.Is there any way to skip the serialization of null objects in newtonsoft JSON.

Answer 1

I wrote a quick test app to show you what you might want to try. There is a great attribute for Json.Net, JsonObject , coupled with the setting MemberSerialization.OptIn . This means that only properties with JsonProperty will be serialized.

public class JsonNet_35883686
{
    [JsonObject(MemberSerialization.OptIn)]
    public class CreditCard
    {
        [JsonProperty]
        public int Id { get; set; }
        public int CustomerId { get; set; }
    }

    public static void Run()
    {
        var cc = new CreditCard {Id = 1, CustomerId = 123};
        var json = JsonConvert.SerializeObject(cc);
        Console.WriteLine(json);

        cc = null;
        json = JsonConvert.SerializeObject(cc);
        Console.WriteLine(json);
    }
}

The output of run is (the reason Id is serialized is because I used JsonProperty

{"Id":1}
null

Hope this helps.