向 json.net 添加自定义属性

问题描述

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

JSON.NET comes with property attributes like [JsonIgnore] and [JsonProperty].

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

I want to create some custom ones that get run when the serialisation runs e.g. [JsonIgnoreSerialize] or [JsonIgnoreDeserialize]

我将如何扩展框架以包含它?

How would I go about extending the framework to include this?

推荐答案

你可以像这样写一个自定义的合约解析器

You can write a custom contract resolver like this

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;
    }
}

你可以在序列化/反序列化中使用它

You can use it in serialization/deserialization like

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

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

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