JSON.Net deserialization populate missing properties

Question

I want to deserialize a json object into ac# class and have a completely populated default object even if my JSON is missing the information. I've tried

• Annotation with [DefaultValue]
• Creating constructors for the classes
• Deserializing with a settings object

Settings object:

new JsonSerializerSettings {
    DefaultValueHandling = DefaultValueHandling.Populate
    NulValueHandling = NullValueHandling.Include
    ObjectCreationHandling = ObjectCreationHandling.Replace
}

Consider these c# classes

public class Root{
    public SpecialProperty name {get;set;}
    public SpecialProperty surname {get;set;}
}

public class SpecialProperty {
    string type {get;set;}
    string value {get;set;}
}

Consider this JSON

"Root" : {
    "name" : { 
        "type" : "string",
        "value": "MyFirstname"
    }
}

How can I deserialize this json into an object with the available data serialized into a new object and the missing properties, in this case, set to string.empty ?

Answer 1

一种解决方案可能是反序列化为对象X，将默认值存储到对象Y，然后使用类似AutoMapper的方法将非空值从X映射到Y。

Answer 2

The easiest workaround is putting the default value you want in the constructor.

public class Root
{
    public SpecialProperty Name { get; set; }
    public SpecialProperty Surname { get; set; }

    public Root()
    {
        this.Name = SpecialProperty.GetEmptyInstance();
        this.Surname = SpecialProperty.GetEmptyInstance();
    }
}

public class SpecialProperty
{
    public string Name { get; set; }
    public string Type { get; set; }

    public static SpecialProperty GetEmptyInstance()
    {
         return new SpecialProperty
         {
              Name = string.Empty,
              Type = string.Empty
         };
    }
}