c# - 向 json.net 添加自定义属性

Question

JSON.NET 带有 [JsonIgnore] 和 [JsonProperty] 等属性。

我想创建一些在序列化运行时运行的自定义序列，例如[JsonIgnoreSerialize] 或 [JsonIgnoreDeserialize]

我将如何扩展框架以包含它？

Answer 1

您可以像这样编写自定义契约(Contract)解析器

public class MyContractResolver<T> : Newtonsoft.Json.Serialization.DefaultContractResolver 
                                        where T : Attribute
{
    Type _AttributeToIgnore = null;

    public MyContractResolver()
    {
        _AttributeToIgnore = typeof(T);
    }

    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        var list =  type.GetProperties()
                    .Where(x => !x.GetCustomAttributes().Any(a => a.GetType() == _AttributeToIgnore))
                    .Select(p => new JsonProperty()
                    {
                        PropertyName = p.Name,
                        PropertyType = p.PropertyType,
                        Readable = true,
                        Writable = true,
                        ValueProvider = base.CreateMemberValueProvider(p)
                    }).ToList();

        return list;
    }
}

你可以像这样在序列化/反序列化中使用它

var json = JsonConvert.SerializeObject(
            obj, 
            new JsonSerializerSettings() {
                ContractResolver = new MyContractResolver<JsonIgnoreSerialize>()
            });

var obj = JsonConvert.DeserializeObject<SomeType>(
            json, 
            new JsonSerializerSettings() {
                ContractResolver = new MyContractResolver<JsonIgnoreDeserialize>()
            });