Why when I deserialize with JSON.NET ignores my default value?

£可爱£侵袭症+ 提交于 2019-11-29 13:10:24
nick_w

The DefaultValue attribute does not set the value of the property. See this question: .NET DefaultValue attribute

What you might be better off doing is setting the value in the constructor:

public class AssignmentContentItem
{
    [JsonProperty("Id")]
    public string Id { get; set; }
    [JsonProperty("Qty")]
    public int Quantity { get; set; }

    public AssignmentContentItem()
    {
        this.Quantity = 1;
    }
}

Where this line:

AssignmentContentItem item =
    JsonConvert.DeserializeObject<AssignmentContentItem>("{\"Id\":\"Q0\"}");

Results in an AssignmentContentItem with its Quantity set to 1.

You can use the the DefaultValueHandling.Populate setting so that Json.Net will populate the created object with the default value.

public static List<AssignmentContentItem> DeserializeAssignmentContent(string jsonContent)
{
    return JsonConvert.DeserializeObject<List<AssignmentContentItem>>(jsonContent, new JsonSerializerSettings
    { 
            DefaultValueHandling = DefaultValueHandling.Populate, 
            NullValueHandling = NullValueHandling.Ignore 
    });
}

http://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_DefaultValueHandling.htm

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