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如何在RavenDB中使用自定义JSON.NET转换器从动态DLL反序列化为类型?

更新时间:2023-10-14 07:48:51

在要指定Assembly生成类型的位置,这是创建自定义转换器的方式.我所有的自定义类型均源自IEntity.您需要执行此操作,以便解串器知道何时将钩子插入自定义类.

Where you want to specify the Assembly to generate the types, this is how you create a custom converter. All of my custom types derive from IEntity. You need to do this so that the deserializer knows when hook into your custom class.

public class DynamicAssemblyJsonConverter : JsonConverter
{
    private Assembly dynamicAssembly = null;

    public DynamicAssemblyJsonConverter(Assembly dynamicAssembly)
    {
        this.dynamicAssembly = dynamicAssembly;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        serializer.Serialize(writer, value);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject jObject = JObject.Load(reader);

        var typeName = jObject["$type"].Value<string>().Split(',')[0];

        var target = dynamicAssembly.CreateInstance(typeName);

        serializer.Populate(jObject.CreateReader(), target);

        return target;
    }

    public override bool CanConvert(Type objectType)
    {
        return objectType is IEntity;
    }
}

如果您正在使用RavenDB(就像我一样),请创建此CustomConverter,然后将其分配给Conventions.CustomizeJsonSerializer,然后在查询或加载之前将其应用于Raven.

If you are using RavenDB (like I am), create this CustomConverter and then apply it to Raven before you query or load by assigning it to: Conventions.CustomizeJsonSerializer.