Json.net仅序列化某些属性 [英] Json.net serialize only certain properties

问题描述

Json.net可以通过任何方式仅指定要序列化的属性吗?还是基于绑定标志(例如仅声明的)序列化某些属性?

Does Json.net have any way to specify only the properties you want to be serialized? or alternatively serialize certain properties based on binding flags like Declared Only?

现在我正在使用JObject.FromObject(MainObj.SubObj);来获取SubObj的所有属性，SubObj是遵循ISubObject接口的类的实例:

Right now I am using JObject.FromObject(MainObj.SubObj); to get all properties of SubObj which is an instance of a class that obeys the ISubObject interface:

public interface ISubObject
{

}

public class ParentSubObject : ISubObject
{
    public string A { get; set; }
}


public class SubObjectWithOnlyDeclared : ParentSubObject
{
    [JsonInclude] // This is fake, but what I am wishing existed
    public string B { get; set; }

    [JsonInclude] // This is fake, but what I am wishing existed
    public string C { get; set; }
}

public class NormalSubObject: ParentSubObject
{
    public string B { get; set; }
}

如果MainObj.SubObj是NormalSubObject，它将同时对A和B进行序列化，但是如果它是SubObjectWithOnlyDeclared，则将仅对B和C进行序列化，而忽略父属性

If MainObj.SubObj was a NormalSubObject it would serailize both A and B but if it was SubObjectWithOnlyDeclared it would serailize only B and C and ignore the parent property

推荐答案

您可以编写如下的自定义ContractResolver

You can write a custom ContractResolver like below

public class IgnoreParentPropertiesResolver : DefaultContractResolver
{
    bool IgnoreBase = false;
    public IgnoreParentPropertiesResolver(bool ignoreBase)
    {
        IgnoreBase = ignoreBase;
    }
    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        var allProps = base.CreateProperties(type, memberSerialization);
        if (!IgnoreBase) return allProps;

        //Choose the properties you want to serialize/deserialize
        var props = type.GetProperties(~BindingFlags.FlattenHierarchy); 

        return allProps.Where(p => props.Any(a => a.Name == p.PropertyName)).ToList();
    }
}

---

现在，您可以在序列化过程中使用它，如下所示:

---

Now you can use it in your serialization process as:

var settings = new JsonSerializerSettings() { 
                      ContractResolver = new IgnoreParentPropertiesResolver(true) 
               };
var json1 = JsonConvert.SerializeObject(new SubObjectWithOnlyDeclared(),settings );

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