How to ignore a property in class if null, using json.net

Question

I am using Json.NET to serialize a class to JSON.

I have the class like this:

class Test1 {     [JsonProperty("id")]     public string ID { get; set; }     [JsonProperty("label")]     public string Label { get; set; }     [JsonProperty("url")]     public string URL { get; set; }     [JsonProperty("item")]     public List<Test2> Test2List { get; set; } } 

I want to add a JsonIgnore() attribute to Test2List property only when Test2List is null. If it is not null then I want to include it in my json.

Answer 1

An alternate solution using the JsonProperty attribute:

[JsonProperty(NullValueHandling=NullValueHandling.Ignore)] // or [JsonProperty("property_name", NullValueHandling=NullValueHandling.Ignore)]  // or for all properties in a class [JsonObject(ItemNullValueHandling = NullValueHandling.Ignore)] 

As seen in this online doc.